{"id":4666,"date":"2026-09-24T09:00:00","date_gmt":"2026-09-24T09:00:00","guid":{"rendered":"https:\/\/otus.ru\/journal\/?p=4666"},"modified":"2026-09-25T15:28:15","modified_gmt":"2026-09-25T15:28:15","slug":"operatory-spiskov-v-js","status":"publish","type":"post","link":"https:\/\/otus.ru\/journal\/operatory-spiskov-v-js\/","title":{"rendered":"\u041c\u0435\u0442\u043e\u0434\u044b \u043c\u0430\u0441\u0441\u0438\u0432\u043e\u0432 \u0432 JavaScript: \u043a\u0440\u0430\u0442\u043a\u043e \u0438 \u043f\u043e\u043d\u044f\u0442\u043d\u043e, \u0441 \u043f\u0440\u0438\u043c\u0435\u0440\u0430\u043c\u0438"},"content":{"rendered":"<p>\u0412 JavaScript \u00ab\u0441\u043f\u0438\u0441\u043e\u043a\u00bb &#8212; \u044d\u0442\u043e <strong>\u043c\u0430\u0441\u0441\u0438\u0432<\/strong> (<code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">Array<\/code>), \u0430 \u00ab\u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u044b \u0441\u043f\u0438\u0441\u043a\u043e\u0432\u00bb &#8212; \u044d\u0442\u043e <strong>\u043c\u0435\u0442\u043e\u0434\u044b \u043c\u0430\u0441\u0441\u0438\u0432\u0430<\/strong>: \u0432\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u044b\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0432\u0440\u043e\u0434\u0435 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">map<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">filter<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">reduce<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">find<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">push<\/code> \u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">splice<\/code>, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0432\u044b\u0437\u044b\u0432\u0430\u044e\u0442\u0441\u044f \u0447\u0435\u0440\u0435\u0437 \u0442\u043e\u0447\u043a\u0443 (<code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">arr.map(...)<\/code>). \u041a\u0440\u0430\u0442\u043a\u043e: \u043e\u0434\u043d\u0438 \u043c\u0435\u0442\u043e\u0434\u044b <strong>\u043c\u0435\u043d\u044f\u044e\u0442 \u0441\u0430\u043c \u043c\u0430\u0441\u0441\u0438\u0432<\/strong> (\u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c, \u0443\u0434\u0430\u043b\u0438\u0442\u044c, \u043e\u0442\u0441\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u0430\u0442\u044c), \u0434\u0440\u0443\u0433\u0438\u0435 <strong>\u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u044e\u0442 \u043d\u043e\u0432\u044b\u0439 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442<\/strong>, \u043d\u0435 \u0442\u0440\u043e\u0433\u0430\u044f \u0438\u0441\u0445\u043e\u0434\u043d\u0438\u043a (\u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u0442\u044c, \u043e\u0442\u0444\u0438\u043b\u044c\u0442\u0440\u043e\u0432\u0430\u0442\u044c, \u043d\u0430\u0439\u0442\u0438, \u043f\u043e\u0441\u0447\u0438\u0442\u0430\u0442\u044c).<\/p>\n<div class=\"oj-toc\" style=\"background:#f6f6f6;border-radius:8px;padding:14px 20px;margin:20px 0\">\n<p><strong>\u0421\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435<\/strong><\/p>\n<ol>\n<li><a href=\"#s1\">\u0422\u0440\u0438 \u0441\u043b\u043e\u0432\u0430, \u0431\u0435\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043c\u0435\u0442\u043e\u0434\u044b \u043d\u0435 \u043e\u0431\u044a\u044f\u0441\u043d\u0438\u0442\u044c<\/a><\/li>\n<li><a href=\"#s2\">\u0428\u043f\u0430\u0440\u0433\u0430\u043b\u043a\u0430: \u0447\u0442\u043e \u0434\u0435\u043b\u0430\u0435\u0442 \u043c\u0435\u0442\u043e\u0434 \u0438 \u0447\u0442\u043e \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442<\/a><\/li>\n<li><a href=\"#s3\">\u041e\u0434\u0438\u043d \u043f\u0440\u0438\u043c\u0435\u0440: map, filter, reduce \u0438 find \u0432\u043c\u0435\u0441\u0442\u0435<\/a><\/li>\n<li><a href=\"#s4\">\u0414\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u0438 \u0443\u0434\u0430\u043b\u0438\u0442\u044c: push, pop, shift, unshift, splice<\/a><\/li>\n<li><a href=\"#s5\">\u041f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u0442\u044c \u0438 \u0441\u0432\u0435\u0440\u043d\u0443\u0442\u044c: map, filter, reduce, flatMap<\/a><\/li>\n<li><a href=\"#s6\">\u041d\u0430\u0439\u0442\u0438 \u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u0442\u044c: find, includes, some, every<\/a><\/li>\n<li><a href=\"#s7\">\u0427\u0430\u0441\u0442\u044b\u0435 \u043e\u0448\u0438\u0431\u043a\u0438: \u043d\u0435\u0432\u0435\u0440\u043d\u043e -&gt; \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 -&gt; \u043a\u0430\u043a \u0438\u0441\u043f\u0440\u0430\u0432\u0438\u0442\u044c<\/a><\/li>\n<li><a href=\"#s8\">\u041a\u0430\u043a \u0432\u044b\u0431\u0440\u0430\u0442\u044c \u043c\u0435\u0442\u043e\u0434 \u043f\u043e\u0434 \u0437\u0430\u0434\u0430\u0447\u0443<\/a><\/li>\n<li><a href=\"#s9\">\u0412\u044b\u0432\u043e\u0434\u044b<\/a><\/li>\n<li><a href=\"#s10\">\u0413\u0434\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \/ \u0441\u0432\u044f\u0437\u044c \u0441 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u043e\u0439<\/a><\/li>\n<li><a href=\"#s11\">FAQ<\/a><\/li>\n<\/ol>\n<\/div>\n<p>\u041d\u0438\u0436\u0435 &#8212; \u0448\u043f\u0430\u0440\u0433\u0430\u043b\u043a\u0430 \u043f\u043e \u043e\u0441\u043d\u043e\u0432\u043d\u044b\u043c \u043c\u0435\u0442\u043e\u0434\u0430\u043c, \u043e\u0434\u0438\u043d \u0441\u043a\u0432\u043e\u0437\u043d\u043e\u0439 \u043f\u0440\u0438\u043c\u0435\u0440, \u043c\u0435\u0442\u043e\u0434\u044b \u043f\u043e \u0433\u0440\u0443\u043f\u043f\u0430\u043c \u0438 \u0442\u0438\u043f\u043e\u0432\u044b\u0435 \u043e\u0448\u0438\u0431\u043a\u0438. \u0412\u0441\u0435 \u043f\u0440\u0438\u043c\u0435\u0440\u044b \u043f\u0440\u043e\u0432\u0435\u0440\u0435\u043d\u044b 24.09.2026 \u0432 Node.js 24.21 (\u0430\u043a\u0442\u0443\u0430\u043b\u044c\u043d\u0430\u044f LTS); \u0432 \u0441\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445 \u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0430\u0445 \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0442 \u0442\u0430\u043a \u0436\u0435.<\/p>\n<h2 id=\"s1\">\u0422\u0440\u0438 \u0441\u043b\u043e\u0432\u0430, \u0431\u0435\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043c\u0435\u0442\u043e\u0434\u044b \u043d\u0435 \u043e\u0431\u044a\u044f\u0441\u043d\u0438\u0442\u044c<\/h2>\n<ul>\n<li><strong>\u041a\u043e\u043b\u0431\u044d\u043a<\/strong> &#8212; \u0444\u0443\u043d\u043a\u0446\u0438\u044f, \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u0432\u044b \u043f\u0435\u0440\u0435\u0434\u0430\u0435\u0442\u0435 \u0432 \u043c\u0435\u0442\u043e\u0434; \u043c\u0435\u0442\u043e\u0434 \u0441\u0430\u043c \u0432\u044b\u0437\u044b\u0432\u0430\u0435\u0442 \u0435\u0435 \u0434\u043b\u044f \u043a\u0430\u0436\u0434\u043e\u0433\u043e \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u0430: <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">arr.map((item) =&gt; item * 2)<\/code>. \u041e\u0431\u044b\u0447\u043d\u043e \u043a\u043e\u043b\u0431\u044d\u043a \u043f\u043e\u043b\u0443\u0447\u0430\u0435\u0442 \u0442\u0440\u0438 \u0430\u0440\u0433\u0443\u043c\u0435\u043d\u0442\u0430: \u044d\u043b\u0435\u043c\u0435\u043d\u0442, \u0438\u043d\u0434\u0435\u043a\u0441, \u0432\u0435\u0441\u044c \u043c\u0430\u0441\u0441\u0438\u0432.<\/li>\n<li><strong>\u041c\u0443\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0439 \u043c\u0435\u0442\u043e\u0434<\/strong> &#8212; \u0438\u0437\u043c\u0435\u043d\u044f\u0435\u0442 \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u0439 \u043c\u0430\u0441\u0441\u0438\u0432 (<code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">push<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">splice<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">sort<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">reverse<\/code>). \u041f\u043e\u0441\u043b\u0435 \u0432\u044b\u0437\u043e\u0432\u0430 \u0441\u0442\u0430\u0440\u043e\u0433\u043e \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u0443\u0436\u0435 \u043d\u0435\u0442.<\/li>\n<li><strong>\u0412\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u043c\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435<\/strong> &#8212; \u0442\u043e, \u0447\u0442\u043e \u043c\u0435\u0442\u043e\u0434 \u043e\u0442\u0434\u0430\u0435\u0442 \u043e\u0431\u0440\u0430\u0442\u043d\u043e. \u0423 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">map<\/code> \u044d\u0442\u043e \u043d\u043e\u0432\u044b\u0439 \u043c\u0430\u0441\u0441\u0438\u0432, \u0443 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">find<\/code> &#8212; \u043e\u0434\u0438\u043d \u044d\u043b\u0435\u043c\u0435\u043d\u0442, \u0443 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">push<\/code> &#8212; \u043d\u043e\u0432\u0430\u044f \u0434\u043b\u0438\u043d\u0430 \u043c\u0430\u0441\u0441\u0438\u0432\u0430 (\u0430 \u043d\u0435 \u0441\u0430\u043c \u043c\u0430\u0441\u0441\u0438\u0432), \u0443 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">forEach<\/code> &#8212; \u0432\u0441\u0435\u0433\u0434\u0430 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">undefined<\/code>.<\/li>\n<\/ul>\n<p>\u041f\u0443\u0442\u0430\u043d\u0438\u0446\u0430 \u00ab\u043f\u043e\u0447\u0435\u043c\u0443 \u0432 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439 \u0447\u0438\u0441\u043b\u043e, \u0430 \u043d\u0435 \u043c\u0430\u0441\u0441\u0438\u0432\u00bb \u043f\u043e\u0447\u0442\u0438 \u0432\u0441\u0435\u0433\u0434\u0430 \u0438\u0437-\u0437\u0430 \u0442\u0440\u0435\u0442\u044c\u0435\u0433\u043e \u043f\u0443\u043d\u043a\u0442\u0430.<\/p>\n<h2 id=\"s2\">\u0428\u043f\u0430\u0440\u0433\u0430\u043b\u043a\u0430: \u0447\u0442\u043e \u0434\u0435\u043b\u0430\u0435\u0442 \u043c\u0435\u0442\u043e\u0434 \u0438 \u0447\u0442\u043e \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442<\/h2>\n<table>\n<thead>\n<tr>\n<th>\u041c\u0435\u0442\u043e\u0434<\/th>\n<th>\u0427\u0442\u043e \u0434\u0435\u043b\u0430\u0435\u0442<\/th>\n<th>\u0412\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442<\/th>\n<th>\u041c\u0435\u043d\u044f\u0435\u0442 \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u0439?<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">push(x)<\/code> \/ <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">pop()<\/code><\/td>\n<td>\u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u0432 \u043a\u043e\u043d\u0435\u0446 \/ \u0443\u0431\u0440\u0430\u0442\u044c \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0438\u0439<\/td>\n<td>\u043d\u043e\u0432\u0443\u044e \u0434\u043b\u0438\u043d\u0443 \/ \u0443\u0431\u0440\u0430\u043d\u043d\u044b\u0439 \u044d\u043b\u0435\u043c\u0435\u043d\u0442<\/td>\n<td>\u0434\u0430<\/td>\n<\/tr>\n<tr>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">unshift(x)<\/code> \/ <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">shift()<\/code><\/td>\n<td>\u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u0432 \u043d\u0430\u0447\u0430\u043b\u043e \/ \u0443\u0431\u0440\u0430\u0442\u044c \u043f\u0435\u0440\u0432\u044b\u0439<\/td>\n<td>\u043d\u043e\u0432\u0443\u044e \u0434\u043b\u0438\u043d\u0443 \/ \u0443\u0431\u0440\u0430\u043d\u043d\u044b\u0439 \u044d\u043b\u0435\u043c\u0435\u043d\u0442<\/td>\n<td>\u0434\u0430<\/td>\n<\/tr>\n<tr>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">splice(i, n, ...)<\/code><\/td>\n<td>\u0443\u0434\u0430\u043b\u0438\u0442\u044c <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">n<\/code> \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432 \u0441 \u0438\u043d\u0434\u0435\u043a\u0441\u0430 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">i<\/code> \u0438 \u0432\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u043d\u043e\u0432\u044b\u0435<\/td>\n<td>\u043c\u0430\u0441\u0441\u0438\u0432 \u0443\u0434\u0430\u043b\u0435\u043d\u043d\u044b\u0445<\/td>\n<td>\u0434\u0430<\/td>\n<\/tr>\n<tr>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">slice(a, b)<\/code><\/td>\n<td>\u0432\u044b\u0440\u0435\u0437\u0430\u0442\u044c \u043a\u0443\u0441\u043e\u043a <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">[a, b)<\/code><\/td>\n<td>\u043d\u043e\u0432\u044b\u0439 \u043c\u0430\u0441\u0441\u0438\u0432<\/td>\n<td>\u043d\u0435\u0442<\/td>\n<\/tr>\n<tr>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">map(fn)<\/code><\/td>\n<td>\u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u0442\u044c \u043a\u0430\u0436\u0434\u044b\u0439 \u044d\u043b\u0435\u043c\u0435\u043d\u0442<\/td>\n<td>\u043d\u043e\u0432\u044b\u0439 \u043c\u0430\u0441\u0441\u0438\u0432 \u0442\u043e\u0439 \u0436\u0435 \u0434\u043b\u0438\u043d\u044b<\/td>\n<td>\u043d\u0435\u0442<\/td>\n<\/tr>\n<tr>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">filter(fn)<\/code><\/td>\n<td>\u043e\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b, \u0434\u043b\u044f \u043a\u043e\u0442\u043e\u0440\u044b\u0445 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">fn<\/code> \u0432\u0435\u0440\u043d\u0443\u043b \u0438\u0441\u0442\u0438\u043d\u043d\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435<\/td>\n<td>\u043d\u043e\u0432\u044b\u0439 \u043c\u0430\u0441\u0441\u0438\u0432<\/td>\n<td>\u043d\u0435\u0442<\/td>\n<\/tr>\n<tr>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">reduce(fn, init)<\/code><\/td>\n<td>\u0441\u0432\u0435\u0440\u043d\u0443\u0442\u044c \u043c\u0430\u0441\u0441\u0438\u0432 \u0432 \u043e\u0434\u043d\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435<\/td>\n<td>\u043e\u0434\u043d\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 (\u0447\u0438\u0441\u043b\u043e, \u043e\u0431\u044a\u0435\u043a\u0442, \u043c\u0430\u0441\u0441\u0438\u0432)<\/td>\n<td>\u043d\u0435\u0442<\/td>\n<\/tr>\n<tr>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">find(fn)<\/code> \/ <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">findIndex(fn)<\/code><\/td>\n<td>\u043d\u0430\u0439\u0442\u0438 \u043f\u0435\u0440\u0432\u044b\u0439 \u043f\u043e\u0434\u0445\u043e\u0434\u044f\u0449\u0438\u0439<\/td>\n<td>\u044d\u043b\u0435\u043c\u0435\u043d\u0442 \u0438\u043b\u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">undefined<\/code> \/ \u0438\u043d\u0434\u0435\u043a\u0441 \u0438\u043b\u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">-1<\/code><\/td>\n<td>\u043d\u0435\u0442<\/td>\n<\/tr>\n<tr>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">some(fn)<\/code> \/ <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">every(fn)<\/code><\/td>\n<td>\u0435\u0441\u0442\u044c \u043b\u0438 \u0445\u043e\u0442\u044c \u043e\u0434\u0438\u043d \/ \u0432\u0441\u0435 \u043b\u0438 \u043f\u043e\u0434\u0445\u043e\u0434\u044f\u0442<\/td>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">true<\/code> \u0438\u043b\u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">false<\/code><\/td>\n<td>\u043d\u0435\u0442<\/td>\n<\/tr>\n<tr>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">includes(x)<\/code> \/ <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">indexOf(x)<\/code><\/td>\n<td>\u0435\u0441\u0442\u044c \u043b\u0438 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \/ \u0433\u0434\u0435 \u043e\u043d\u043e<\/td>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">true<\/code>\/<code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">false<\/code> \/ \u0438\u043d\u0434\u0435\u043a\u0441 \u0438\u043b\u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">-1<\/code><\/td>\n<td>\u043d\u0435\u0442<\/td>\n<\/tr>\n<tr>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">sort(fn)<\/code> \/ <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">reverse()<\/code><\/td>\n<td>\u043e\u0442\u0441\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u0430\u0442\u044c \/ \u0440\u0430\u0437\u0432\u0435\u0440\u043d\u0443\u0442\u044c<\/td>\n<td>\u0442\u043e\u0442 \u0436\u0435 \u043c\u0430\u0441\u0441\u0438\u0432<\/td>\n<td>\u0434\u0430<\/td>\n<\/tr>\n<tr>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">forEach(fn)<\/code><\/td>\n<td>\u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0435 \u0434\u043b\u044f \u043a\u0430\u0436\u0434\u043e\u0433\u043e<\/td>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">undefined<\/code><\/td>\n<td>\u0441\u0430\u043c \u043d\u0435\u0442<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u0423\u043f\u0440\u043e\u0449\u0435\u043d\u0438\u0435: \u043a\u043e\u043b\u043e\u043d\u043a\u0430 \u00ab\u043c\u0435\u043d\u044f\u0435\u0442 \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u0439?\u00bb \u0433\u043e\u0432\u043e\u0440\u0438\u0442 \u043e \u0441\u0430\u043c\u043e\u043c \u043c\u0435\u0442\u043e\u0434\u0435. \u0415\u0441\u043b\u0438 \u043a\u043e\u043b\u0431\u044d\u043a \u0432\u043d\u0443\u0442\u0440\u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">map<\/code> \u0438\u043b\u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">forEach<\/code> \u043c\u0435\u043d\u044f\u0435\u0442 \u043f\u043e\u043b\u044f \u043e\u0431\u044a\u0435\u043a\u0442\u043e\u0432 (<code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">task.done = true<\/code>), \u043e\u0431\u044a\u0435\u043a\u0442\u044b \u0438\u0437\u043c\u0435\u043d\u044f\u0442\u0441\u044f \u0438 \u0432 \u0438\u0441\u0445\u043e\u0434\u043d\u043e\u043c \u043c\u0430\u0441\u0441\u0438\u0432\u0435: \u043d\u043e\u0432\u044b\u0439 \u043c\u0430\u0441\u0441\u0438\u0432 \u043e\u0442 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">map<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">filter<\/code> \u0438\u043b\u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">slice<\/code> \u0445\u0440\u0430\u043d\u0438\u0442 \u0441\u0441\u044b\u043b\u043a\u0438 \u043d\u0430 \u0442\u0435 \u0436\u0435 \u043e\u0431\u044a\u0435\u043a\u0442\u044b (\u043f\u043e\u0432\u0435\u0440\u0445\u043d\u043e\u0441\u0442\u043d\u0430\u044f \u043a\u043e\u043f\u0438\u044f), \u0430 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">forEach<\/code> \u0432\u043e\u043e\u0431\u0449\u0435 \u043d\u0438\u0447\u0435\u0433\u043e \u043d\u0435 \u043a\u043e\u043f\u0438\u0440\u0443\u0435\u0442.<\/p>\n<h2 id=\"s3\">\u041e\u0434\u0438\u043d \u043f\u0440\u0438\u043c\u0435\u0440: map, filter, reduce \u0438 find \u0432\u043c\u0435\u0441\u0442\u0435<\/h2>\n<p>\u0421\u043f\u0438\u0441\u043e\u043a \u0437\u0430\u0434\u0430\u0447 \u043d\u0430 \u0434\u0435\u043d\u044c, \u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u043e\u0433\u043e \u043d\u0443\u0436\u043d\u043e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043d\u0430\u0437\u0432\u0430\u043d\u0438\u044f, \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043d\u044b\u0435 \u0437\u0430\u0434\u0430\u0447\u0438, \u043f\u043e\u0442\u0440\u0430\u0447\u0435\u043d\u043d\u043e\u0435 \u043d\u0430 \u043d\u0438\u0445 \u0432\u0440\u0435\u043c\u044f \u0438 \u043f\u0435\u0440\u0432\u0443\u044e \u0434\u043b\u0438\u043d\u043d\u0443\u044e \u0437\u0430\u0434\u0430\u0447\u0443.<\/p>\n<pre style=\"background:#282c34;color:#abb2bf;border-radius:8px;padding:16px 20px;margin:20px 0;overflow-x:auto;font-size:14px;line-height:1.55;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\"><code style=\"background:none\"><span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">tasks<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> [<\/span>\n<span style=\"color: #ABB2BF\">  { <\/span><span style=\"color: #E06C75\">name<\/span><span style=\"color: #56B6C2\">:<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #98C379\">\"\u041d\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u043e\u0442\u0447\u0435\u0442\"<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #E06C75\">minutes<\/span><span style=\"color: #56B6C2\">:<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #D19A66\">120<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #E06C75\">done<\/span><span style=\"color: #56B6C2\">:<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E5C07B\">true<\/span><span style=\"color: #ABB2BF\"> },<\/span>\n<span style=\"color: #ABB2BF\">  { <\/span><span style=\"color: #E06C75\">name<\/span><span style=\"color: #56B6C2\">:<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #98C379\">\"\u0421\u043e\u0437\u0432\u043e\u043d \u0441 \u043a\u043e\u043c\u0430\u043d\u0434\u043e\u0439\"<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #E06C75\">minutes<\/span><span style=\"color: #56B6C2\">:<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #D19A66\">30<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #E06C75\">done<\/span><span style=\"color: #56B6C2\">:<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E5C07B\">false<\/span><span style=\"color: #ABB2BF\"> },<\/span>\n<span style=\"color: #ABB2BF\">  { <\/span><span style=\"color: #E06C75\">name<\/span><span style=\"color: #56B6C2\">:<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #98C379\">\"\u0420\u0435\u0432\u044c\u044e \u043a\u043e\u0434\u0430\"<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #E06C75\">minutes<\/span><span style=\"color: #56B6C2\">:<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #D19A66\">45<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #E06C75\">done<\/span><span style=\"color: #56B6C2\">:<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E5C07B\">true<\/span><span style=\"color: #ABB2BF\"> },<\/span>\n<span style=\"color: #ABB2BF\">  { <\/span><span style=\"color: #E06C75\">name<\/span><span style=\"color: #56B6C2\">:<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #98C379\">\"\u041f\u043e\u0447\u0438\u0441\u0442\u0438\u0442\u044c \u043f\u043e\u0447\u0442\u0443\"<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #E06C75\">minutes<\/span><span style=\"color: #56B6C2\">:<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #D19A66\">15<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #E06C75\">done<\/span><span style=\"color: #56B6C2\">:<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E5C07B\">false<\/span><span style=\"color: #ABB2BF\"> },<\/span>\n<span style=\"color: #ABB2BF\">];<\/span>\n\n<span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">names<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">tasks<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">map<\/span><span style=\"color: #ABB2BF\">((<\/span><span style=\"color: #E06C75\">task<\/span><span style=\"color: #ABB2BF\">) =&gt; <\/span><span style=\"color: #E06C75\">task<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">name<\/span><span style=\"color: #ABB2BF\">);<\/span>\n<span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">doneTasks<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">tasks<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">filter<\/span><span style=\"color: #ABB2BF\">((<\/span><span style=\"color: #E06C75\">task<\/span><span style=\"color: #ABB2BF\">) =&gt; <\/span><span style=\"color: #E06C75\">task<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">done<\/span><span style=\"color: #ABB2BF\">);<\/span>\n<span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">doneMinutes<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">doneTasks<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">reduce<\/span><span style=\"color: #ABB2BF\">((<\/span><span style=\"color: #E06C75\">sum<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #E06C75\">task<\/span><span style=\"color: #ABB2BF\">) =&gt; <\/span><span style=\"color: #E06C75\">sum<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">+<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">task<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">minutes<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">0<\/span><span style=\"color: #ABB2BF\">);<\/span>\n<span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">firstLong<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">tasks<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">find<\/span><span style=\"color: #ABB2BF\">((<\/span><span style=\"color: #E06C75\">task<\/span><span style=\"color: #ABB2BF\">) =&gt; <\/span><span style=\"color: #E06C75\">task<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">minutes<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">&gt;<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #D19A66\">40<\/span><span style=\"color: #ABB2BF\">);<\/span>\n\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">names<\/span><span style=\"color: #ABB2BF\">);<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">doneTasks<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">length<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #98C379\">\"\u0437\u0430\u0434\u0430\u0447\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043e\"<\/span><span style=\"color: #ABB2BF\">);<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #98C379\">\"\u041d\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043d\u044b\u0435 \u0443\u0448\u043b\u043e\"<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #E06C75\">doneMinutes<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #98C379\">\"\u043c\u0438\u043d\"<\/span><span style=\"color: #ABB2BF\">);<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">firstLong<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">name<\/span><span style=\"color: #ABB2BF\">);<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">tasks<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">length<\/span><span style=\"color: #ABB2BF\">); <\/span><span style=\"color: #7F848E\">\/\/ \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u0439 \u043c\u0430\u0441\u0441\u0438\u0432 \u043d\u0435 \u0438\u0437\u043c\u0435\u043d\u0438\u043b\u0441\u044f<\/span><\/code><\/pre>\n<p>\u0412\u044b\u0432\u043e\u0434 \u0432 \u043a\u043e\u043d\u0441\u043e\u043b\u0438 Node.js:<\/p>\n<pre style=\"background:#282c34;color:#abb2bf;border-radius:8px;padding:16px 20px;margin:20px 0;overflow-x:auto;font-size:14px;line-height:1.55;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\"><code style=\"background:none\">[\n  &#x27;\u041d\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u043e\u0442\u0447\u0435\u0442&#x27;,\n  &#x27;\u0421\u043e\u0437\u0432\u043e\u043d \u0441 \u043a\u043e\u043c\u0430\u043d\u0434\u043e\u0439&#x27;,\n  &#x27;\u0420\u0435\u0432\u044c\u044e \u043a\u043e\u0434\u0430&#x27;,\n  &#x27;\u041f\u043e\u0447\u0438\u0441\u0442\u0438\u0442\u044c \u043f\u043e\u0447\u0442\u0443&#x27;\n]\n2 \u0437\u0430\u0434\u0430\u0447\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043e\n\u041d\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043d\u044b\u0435 \u0443\u0448\u043b\u043e 165 \u043c\u0438\u043d\n\u041d\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u043e\u0442\u0447\u0435\u0442\n4\n<\/code><\/pre>\n<p>\u0420\u0430\u0437\u0431\u043e\u0440 \u043f\u043e \u0441\u0442\u0440\u043e\u043a\u0430\u043c:<\/p>\n<ul>\n<li><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">map<\/code> \u043f\u0440\u043e\u0448\u0435\u043b \u043f\u043e \u0432\u0441\u0435\u043c \u0447\u0435\u0442\u044b\u0440\u0435\u043c \u0437\u0430\u0434\u0430\u0447\u0430\u043c \u0438 \u0438\u0437 \u043a\u0430\u0436\u0434\u043e\u0439 \u0432\u0437\u044f\u043b <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">name<\/code> &#8212; \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0441\u044f \u043c\u0430\u0441\u0441\u0438\u0432 \u0441\u0442\u0440\u043e\u043a \u0442\u043e\u0439 \u0436\u0435 \u0434\u043b\u0438\u043d\u044b.<\/li>\n<li><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">filter<\/code> \u043e\u0441\u0442\u0430\u0432\u0438\u043b \u0442\u043e\u043b\u044c\u043a\u043e \u043e\u0431\u044a\u0435\u043a\u0442\u044b, \u0433\u0434\u0435 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">done<\/code> \u0438\u0441\u0442\u0438\u043d\u043d\u043e, &#8212; \u0438\u0445 \u0434\u0432\u0430.<\/li>\n<li><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">reduce<\/code> \u043d\u0430\u0447\u0430\u043b \u0441 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">0<\/code> (\u0432\u0442\u043e\u0440\u043e\u0439 \u0430\u0440\u0433\u0443\u043c\u0435\u043d\u0442) \u0438 \u043d\u0430 \u043a\u0430\u0436\u0434\u043e\u043c \u0448\u0430\u0433\u0435 \u043f\u0440\u0438\u0431\u0430\u0432\u043b\u044f\u043b <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">minutes<\/code>: 0 + 120 + 45 = 165.<\/li>\n<li><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">find<\/code> \u043e\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u043b\u0441\u044f \u043d\u0430 \u043f\u0435\u0440\u0432\u043e\u0439 \u0437\u0430\u0434\u0430\u0447\u0435 \u0434\u043b\u0438\u043d\u043d\u0435\u0435 40 \u043c\u0438\u043d\u0443\u0442 \u0438 \u0432\u0435\u0440\u043d\u0443\u043b \u0441\u0430\u043c \u043e\u0431\u044a\u0435\u043a\u0442, \u0430 \u043d\u0435 \u043c\u0430\u0441\u0441\u0438\u0432.<\/li>\n<li><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">tasks<\/code> \u043e\u0441\u0442\u0430\u043b\u0441\u044f \u043f\u0440\u0435\u0436\u043d\u0438\u043c: \u043d\u0438 \u043e\u0434\u0438\u043d \u0438\u0437 \u0447\u0435\u0442\u044b\u0440\u0435\u0445 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0435\u0433\u043e \u043d\u0435 \u043c\u0435\u043d\u044f\u0435\u0442.<\/li>\n<\/ul>\n<p>\u0422\u043e\u0442 \u0436\u0435 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u043c\u043e\u0436\u043d\u043e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0446\u0438\u043a\u043b\u043e\u043c <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">for<\/code>, \u043d\u043e \u043f\u0440\u0438\u0448\u043b\u043e\u0441\u044c \u0431\u044b \u0437\u0430\u0432\u043e\u0434\u0438\u0442\u044c \u043f\u0443\u0441\u0442\u043e\u0439 \u043c\u0430\u0441\u0441\u0438\u0432, \u0441\u0447\u0435\u0442\u0447\u0438\u043a \u0438 \u0441\u043b\u0435\u0434\u0438\u0442\u044c \u0437\u0430 \u0438\u043d\u0434\u0435\u043a\u0441\u0430\u043c\u0438. \u041c\u0435\u0442\u043e\u0434\u044b \u043a\u043e\u0440\u043e\u0447\u0435 \u0438 \u0441\u0440\u0430\u0437\u0443 \u043d\u0430\u0437\u044b\u0432\u0430\u044e\u0442 \u043d\u0430\u043c\u0435\u0440\u0435\u043d\u0438\u0435: \u00ab\u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u0442\u044c\u00bb, \u00ab\u043e\u0442\u043e\u0431\u0440\u0430\u0442\u044c\u00bb, \u00ab\u043f\u043e\u0441\u0447\u0438\u0442\u0430\u0442\u044c\u00bb, \u00ab\u043d\u0430\u0439\u0442\u0438\u00bb.<\/p>\n<h2 id=\"s4\">\u0414\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u0438 \u0443\u0434\u0430\u043b\u0438\u0442\u044c: push, pop, shift, unshift, splice<\/h2>\n<p>\u042d\u0442\u0438 \u043c\u0435\u0442\u043e\u0434\u044b \u043c\u0435\u043d\u044f\u044e\u0442 \u043c\u0430\u0441\u0441\u0438\u0432 \u043d\u0430 \u043c\u0435\u0441\u0442\u0435. \u041e\u0431\u0440\u0430\u0442\u0438\u0442\u0435 \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u043d\u0430 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u043c\u044b\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u0432 \u043a\u043e\u043c\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u044f\u0445.<\/p>\n<pre style=\"background:#282c34;color:#abb2bf;border-radius:8px;padding:16px 20px;margin:20px 0;overflow-x:auto;font-size:14px;line-height:1.55;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\"><code style=\"background:none\"><span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">list<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> [<\/span><span style=\"color: #98C379\">\"a\"<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #98C379\">\"b\"<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #98C379\">\"c\"<\/span><span style=\"color: #ABB2BF\">];<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">list<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">push<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #98C379\">\"d\"<\/span><span style=\"color: #ABB2BF\">));      <\/span><span style=\"color: #7F848E\">\/\/ 4 - \u043d\u043e\u0432\u0430\u044f \u0434\u043b\u0438\u043d\u0430<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">list<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">pop<\/span><span style=\"color: #ABB2BF\">());          <\/span><span style=\"color: #7F848E\">\/\/ \"d\"<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">list<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">unshift<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #98C379\">\"z\"<\/span><span style=\"color: #ABB2BF\">));   <\/span><span style=\"color: #7F848E\">\/\/ 4<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">list<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">shift<\/span><span style=\"color: #ABB2BF\">());        <\/span><span style=\"color: #7F848E\">\/\/ \"z\"<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">list<\/span><span style=\"color: #ABB2BF\">);                <\/span><span style=\"color: #7F848E\">\/\/ [ 'a', 'b', 'c' ]<\/span>\n\n<span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">letters<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> [<\/span><span style=\"color: #98C379\">\"a\"<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #98C379\">\"b\"<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #98C379\">\"c\"<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #98C379\">\"d\"<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #98C379\">\"e\"<\/span><span style=\"color: #ABB2BF\">];<\/span>\n<span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">removed<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">letters<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">splice<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #D19A66\">1<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">2<\/span><span style=\"color: #ABB2BF\">);        <\/span><span style=\"color: #7F848E\">\/\/ \u0441 \u0438\u043d\u0434\u0435\u043a\u0441\u0430 1 \u0443\u0434\u0430\u043b\u0438\u0442\u044c 2<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">removed<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #E06C75\">letters<\/span><span style=\"color: #ABB2BF\">);               <\/span><span style=\"color: #7F848E\">\/\/ [ 'b', 'c' ] [ 'a', 'd', 'e' ]<\/span>\n<span style=\"color: #E06C75\">letters<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">splice<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #D19A66\">1<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">0<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #98C379\">\"X\"<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #98C379\">\"Y\"<\/span><span style=\"color: #ABB2BF\">);               <\/span><span style=\"color: #7F848E\">\/\/ \u0432\u0441\u0442\u0430\u0432\u0438\u0442\u044c, \u043d\u0438\u0447\u0435\u0433\u043e \u043d\u0435 \u0443\u0434\u0430\u043b\u044f\u044f<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">letters<\/span><span style=\"color: #ABB2BF\">);                        <\/span><span style=\"color: #7F848E\">\/\/ [ 'a', 'X', 'Y', 'd', 'e' ]<\/span>\n\n<span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">part<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">letters<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">slice<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #D19A66\">1<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">3<\/span><span style=\"color: #ABB2BF\">);             <\/span><span style=\"color: #7F848E\">\/\/ \u043a\u043e\u043f\u0438\u044f \u0441 1 \u043f\u043e 3 (\u043d\u0435 \u0432\u043a\u043b\u044e\u0447\u0430\u044f)<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">part<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #E06C75\">letters<\/span><span style=\"color: #ABB2BF\">);                  <\/span><span style=\"color: #7F848E\">\/\/ [ 'X', 'Y' ] [ 'a', 'X', 'Y', 'd', 'e' ]<\/span><\/code><\/pre>\n<p><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">splice<\/code> \u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">slice<\/code> \u043f\u0443\u0442\u0430\u044e\u0442 \u0447\u0430\u0449\u0435 \u0432\u0441\u0435\u0433\u043e. \u041c\u043d\u0435\u043c\u043e\u043d\u0438\u043a\u0430: \u0443 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">splice<\/code> \u0435\u0441\u0442\u044c \u043b\u0438\u0448\u043d\u044f\u044f \u0431\u0443\u043a\u0432\u0430 \u00abp\u00bb, \u0438 \u043e\u043d \u00ab\u043f\u043e\u0440\u0442\u0438\u0442\u00bb \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u0439 \u043c\u0430\u0441\u0441\u0438\u0432; <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">slice<\/code> \u0442\u043e\u043b\u044c\u043a\u043e \u0434\u0435\u043b\u0430\u0435\u0442 \u043a\u043e\u043f\u0438\u044e \u043a\u0443\u0441\u043a\u0430.<\/p>\n<p>\u0415\u0441\u043b\u0438 \u0438\u0441\u0445\u043e\u0434\u043d\u0438\u043a \u0442\u0440\u043e\u0433\u0430\u0442\u044c \u043d\u0435\u043b\u044c\u0437\u044f (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u044d\u0442\u043e \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u0430 \u0432 React), \u0435\u0441\u0442\u044c \u043a\u043e\u043f\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u0435\u0440\u0441\u0438\u0438 \u043c\u0443\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0445 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0438\u0437 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u0430 ES2023: <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">toSpliced<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">toSorted<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">toReversed<\/code> \u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">with(i, value)<\/code>.<\/p>\n<pre style=\"background:#282c34;color:#abb2bf;border-radius:8px;padding:16px 20px;margin:20px 0;overflow-x:auto;font-size:14px;line-height:1.55;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\"><code style=\"background:none\"><span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">base<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> [<\/span><span style=\"color: #D19A66\">3<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">1<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">2<\/span><span style=\"color: #ABB2BF\">];<\/span>\n<span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">copy<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">base<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">toSpliced<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #D19A66\">0<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">1<\/span><span style=\"color: #ABB2BF\">);<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">copy<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #E06C75\">base<\/span><span style=\"color: #ABB2BF\">);               <\/span><span style=\"color: #7F848E\">\/\/ [ 1, 2 ] [ 3, 1, 2 ]<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">base<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #C678DD\">with<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #D19A66\">0<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">99<\/span><span style=\"color: #ABB2BF\">), <\/span><span style=\"color: #E06C75\">base<\/span><span style=\"color: #ABB2BF\">);   <\/span><span style=\"color: #7F848E\">\/\/ [ 99, 1, 2 ] [ 3, 1, 2 ]<\/span><\/code><\/pre>\n<p>\u041e\u043d\u0438 \u0435\u0441\u0442\u044c \u0432 Node.js 20+ \u0438 \u0432 \u0430\u043a\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0445 \u0432\u0435\u0440\u0441\u0438\u044f\u0445 \u0431\u0440\u0430\u0443\u0437\u0435\u0440\u043e\u0432; \u0432 \u0441\u0442\u0430\u0440\u043e\u043c \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u0438 \u0438\u0445 \u043d\u0435 \u0431\u0443\u0434\u0435\u0442, \u0442\u0430\u043c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442 \u043a\u043e\u043f\u0438\u044e \u0447\u0435\u0440\u0435\u0437 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">[...arr]<\/code> \u0438 \u043e\u0431\u044b\u0447\u043d\u044b\u0439 \u043c\u0435\u0442\u043e\u0434.<\/p>\n<h2 id=\"s5\">\u041f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u0442\u044c \u0438 \u0441\u0432\u0435\u0440\u043d\u0443\u0442\u044c: map, filter, reduce, flatMap<\/h2>\n<p><strong><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">map<\/code><\/strong> &#8212; \u00ab\u0431\u044b\u043b\u043e N \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432, \u0441\u0442\u0430\u043b\u043e N \u0434\u0440\u0443\u0433\u0438\u0445\u00bb. \u0414\u043b\u0438\u043d\u0430 \u0432\u0441\u0435\u0433\u0434\u0430 \u0442\u0430 \u0436\u0435.<\/p>\n<p><strong><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">filter<\/code><\/strong> &#8212; \u00ab\u0431\u044b\u043b\u043e N, \u043e\u0441\u0442\u0430\u043b\u043e\u0441\u044c \u0441\u0442\u043e\u043b\u044c\u043a\u043e, \u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043f\u0440\u043e\u0448\u043b\u043e \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0443\u00bb. \u041a\u043e\u043b\u0431\u044d\u043a \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442 \u0443\u0441\u043b\u043e\u0432\u0438\u0435; \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442\u0441\u044f \u043a \u043b\u043e\u0433\u0438\u0447\u0435\u0441\u043a\u043e\u043c\u0443, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">false<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">0<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">\"\"<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">null<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">undefined<\/code> \u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">NaN<\/code> \u0441\u0447\u0438\u0442\u0430\u044e\u0442\u0441\u044f \u043b\u043e\u0436\u044c\u044e.<\/p>\n<p><strong><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">reduce<\/code><\/strong> &#8212; \u00ab\u0431\u044b\u043b\u043e N, \u0441\u0442\u0430\u043b\u043e \u043e\u0434\u043d\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435\u00bb. \u041a\u043e\u043b\u0431\u044d\u043a \u043f\u043e\u043b\u0443\u0447\u0430\u0435\u0442 \u0430\u043a\u043a\u0443\u043c\u0443\u043b\u044f\u0442\u043e\u0440 (\u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u043f\u0440\u043e\u0448\u043b\u043e\u0433\u043e \u0448\u0430\u0433\u0430) \u0438 \u0442\u0435\u043a\u0443\u0449\u0438\u0439 \u044d\u043b\u0435\u043c\u0435\u043d\u0442 \u0438 \u043e\u0431\u044f\u0437\u0430\u043d \u0432\u0435\u0440\u043d\u0443\u0442\u044c \u043d\u043e\u0432\u044b\u0439 \u0430\u043a\u043a\u0443\u043c\u0443\u043b\u044f\u0442\u043e\u0440. \u041e\u0434\u043d\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043d\u0435 \u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u043e \u0447\u0438\u0441\u043b\u043e &#8212; \u044d\u0442\u043e \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043e\u0431\u044a\u0435\u043a\u0442. \u041f\u0440\u0438\u043c\u0435\u0440: \u043f\u043e\u0441\u0447\u0438\u0442\u0430\u0442\u044c, \u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0440\u0430\u0437 \u0432\u0441\u0442\u0440\u0435\u0447\u0430\u0435\u0442\u0441\u044f \u043a\u0430\u0436\u0434\u043e\u0435 \u0441\u043b\u043e\u0432\u043e.<\/p>\n<pre style=\"background:#282c34;color:#abb2bf;border-radius:8px;padding:16px 20px;margin:20px 0;overflow-x:auto;font-size:14px;line-height:1.55;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\"><code style=\"background:none\"><span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">words<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> [<\/span><span style=\"color: #98C379\">\"\u043a\u043e\u0442\"<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #98C379\">\"\u043f\u0435\u0441\"<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #98C379\">\"\u043a\u043e\u0442\"<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #98C379\">\"\u0435\u0436\"<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #98C379\">\"\u043a\u043e\u0442\"<\/span><span style=\"color: #ABB2BF\">];<\/span>\n<span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">counts<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">words<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">reduce<\/span><span style=\"color: #ABB2BF\">((<\/span><span style=\"color: #E06C75\">acc<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #E06C75\">w<\/span><span style=\"color: #ABB2BF\">) =&gt; {<\/span>\n<span style=\"color: #ABB2BF\">  <\/span><span style=\"color: #E06C75\">acc<\/span><span style=\"color: #ABB2BF\">[<\/span><span style=\"color: #E06C75\">w<\/span><span style=\"color: #ABB2BF\">] <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> (<\/span><span style=\"color: #E06C75\">acc<\/span><span style=\"color: #ABB2BF\">[<\/span><span style=\"color: #E06C75\">w<\/span><span style=\"color: #ABB2BF\">] <\/span><span style=\"color: #56B6C2\">??<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #D19A66\">0<\/span><span style=\"color: #ABB2BF\">) <\/span><span style=\"color: #56B6C2\">+<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #D19A66\">1<\/span><span style=\"color: #ABB2BF\">;<\/span>\n<span style=\"color: #ABB2BF\">  <\/span><span style=\"color: #C678DD\">return<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">acc<\/span><span style=\"color: #ABB2BF\">;<\/span>\n<span style=\"color: #ABB2BF\">}, {});<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">counts<\/span><span style=\"color: #ABB2BF\">); <\/span><span style=\"color: #7F848E\">\/\/ { '\u043a\u043e\u0442': 3, '\u043f\u0435\u0441': 1, '\u0435\u0436': 1 }<\/span><\/code><\/pre>\n<p>\u0414\u043b\u044f \u0432\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0445 \u043c\u0430\u0441\u0441\u0438\u0432\u043e\u0432 \u0435\u0441\u0442\u044c <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">flat<\/code> (\u0441\u0434\u0435\u043b\u0430\u0442\u044c \u043e\u0434\u0438\u043d \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043f\u043b\u043e\u0441\u043a\u0438\u043c) \u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">flatMap<\/code> (\u0441\u043d\u0430\u0447\u0430\u043b\u0430 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">map<\/code>, \u043f\u043e\u0442\u043e\u043c <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">flat<\/code>):<\/p>\n<pre style=\"background:#282c34;color:#abb2bf;border-radius:8px;padding:16px 20px;margin:20px 0;overflow-x:auto;font-size:14px;line-height:1.55;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\"><code style=\"background:none\"><span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">nested<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> [ [<\/span><span style=\"color: #D19A66\">1<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">2<\/span><span style=\"color: #ABB2BF\">], [<\/span><span style=\"color: #D19A66\">3<\/span><span style=\"color: #ABB2BF\">], [<\/span><span style=\"color: #D19A66\">4<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">5<\/span><span style=\"color: #ABB2BF\">] ];<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">nested<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">flat<\/span><span style=\"color: #ABB2BF\">());                             <\/span><span style=\"color: #7F848E\">\/\/ [ 1, 2, 3, 4, 5 ]<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">([<\/span><span style=\"color: #98C379\">\"a b\"<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #98C379\">\"c\"<\/span><span style=\"color: #ABB2BF\">].<\/span><span style=\"color: #E06C75\">flatMap<\/span><span style=\"color: #ABB2BF\">((<\/span><span style=\"color: #E06C75\">s<\/span><span style=\"color: #ABB2BF\">) =&gt; <\/span><span style=\"color: #E06C75\">s<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">split<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #98C379\">\" \"<\/span><span style=\"color: #ABB2BF\">))); <\/span><span style=\"color: #7F848E\">\/\/ [ 'a', 'b', 'c' ]<\/span><\/code><\/pre>\n<h2 id=\"s6\">\u041d\u0430\u0439\u0442\u0438 \u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u0442\u044c: find, includes, some, every<\/h2>\n<ul>\n<li><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">find<\/code> \u043d\u0443\u0436\u0435\u043d, \u043a\u043e\u0433\u0434\u0430 \u0438\u0449\u0435\u043c \u043f\u043e \u0443\u0441\u043b\u043e\u0432\u0438\u044e \u0438 \u0445\u043e\u0442\u0438\u043c \u0441\u0430\u043c \u044d\u043b\u0435\u043c\u0435\u043d\u0442; <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">findIndex<\/code> &#8212; \u0435\u0433\u043e \u043f\u043e\u0437\u0438\u0446\u0438\u044e; <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">findLast<\/code> &#8212; \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0438\u0439 \u043f\u043e\u0434\u0445\u043e\u0434\u044f\u0449\u0438\u0439.<\/li>\n<li><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">includes<\/code> \u043e\u0442\u0432\u0435\u0447\u0430\u0435\u0442 \u0442\u043e\u043b\u044c\u043a\u043e \u00ab\u0435\u0441\u0442\u044c \u0438\u043b\u0438 \u043d\u0435\u0442\u00bb \u0434\u043b\u044f \u043a\u043e\u043d\u043a\u0440\u0435\u0442\u043d\u043e\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f.<\/li>\n<li><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">some<\/code> &#8212; \u00ab\u0445\u043e\u0442\u044f \u0431\u044b \u043e\u0434\u0438\u043d \u043f\u043e\u0434\u0445\u043e\u0434\u0438\u0442\u00bb, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">every<\/code> &#8212; \u00ab\u043f\u043e\u0434\u0445\u043e\u0434\u044f\u0442 \u0432\u0441\u0435\u00bb.<\/li>\n<\/ul>\n<pre style=\"background:#282c34;color:#abb2bf;border-radius:8px;padding:16px 20px;margin:20px 0;overflow-x:auto;font-size:14px;line-height:1.55;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\"><code style=\"background:none\"><span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">([<\/span><span style=\"color: #D19A66\">1<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">2<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">3<\/span><span style=\"color: #ABB2BF\">].<\/span><span style=\"color: #E06C75\">find<\/span><span style=\"color: #ABB2BF\">((<\/span><span style=\"color: #E06C75\">n<\/span><span style=\"color: #ABB2BF\">) =&gt; <\/span><span style=\"color: #E06C75\">n<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">&gt;<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #D19A66\">5<\/span><span style=\"color: #ABB2BF\">), [<\/span><span style=\"color: #D19A66\">1<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">2<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">3<\/span><span style=\"color: #ABB2BF\">].<\/span><span style=\"color: #E06C75\">findIndex<\/span><span style=\"color: #ABB2BF\">((<\/span><span style=\"color: #E06C75\">n<\/span><span style=\"color: #ABB2BF\">) =&gt; <\/span><span style=\"color: #E06C75\">n<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">&gt;<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #D19A66\">5<\/span><span style=\"color: #ABB2BF\">)); <\/span><span style=\"color: #7F848E\">\/\/ undefined -1<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">([<\/span><span style=\"color: #D19A66\">3<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">8<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">12<\/span><span style=\"color: #ABB2BF\">].<\/span><span style=\"color: #E06C75\">some<\/span><span style=\"color: #ABB2BF\">((<\/span><span style=\"color: #E06C75\">n<\/span><span style=\"color: #ABB2BF\">) =&gt; <\/span><span style=\"color: #E06C75\">n<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">&gt;<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #D19A66\">10<\/span><span style=\"color: #ABB2BF\">), [<\/span><span style=\"color: #D19A66\">3<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">8<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">12<\/span><span style=\"color: #ABB2BF\">].<\/span><span style=\"color: #E06C75\">every<\/span><span style=\"color: #ABB2BF\">((<\/span><span style=\"color: #E06C75\">n<\/span><span style=\"color: #ABB2BF\">) =&gt; <\/span><span style=\"color: #E06C75\">n<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">&gt;<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #D19A66\">1<\/span><span style=\"color: #ABB2BF\">));  <\/span><span style=\"color: #7F848E\">\/\/ true true<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">([<\/span><span style=\"color: #D19A66\">5<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">12<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">8<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">130<\/span><span style=\"color: #ABB2BF\">].<\/span><span style=\"color: #E06C75\">findLast<\/span><span style=\"color: #ABB2BF\">((<\/span><span style=\"color: #E06C75\">n<\/span><span style=\"color: #ABB2BF\">) =&gt; <\/span><span style=\"color: #E06C75\">n<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">&gt;<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #D19A66\">10<\/span><span style=\"color: #ABB2BF\">));                          <\/span><span style=\"color: #7F848E\">\/\/ 130<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">([<\/span><span style=\"color: #E5C07B\">NaN<\/span><span style=\"color: #ABB2BF\">].<\/span><span style=\"color: #E06C75\">indexOf<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E5C07B\">NaN<\/span><span style=\"color: #ABB2BF\">), [<\/span><span style=\"color: #E5C07B\">NaN<\/span><span style=\"color: #ABB2BF\">].<\/span><span style=\"color: #E06C75\">includes<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E5C07B\">NaN<\/span><span style=\"color: #ABB2BF\">));                          <\/span><span style=\"color: #7F848E\">\/\/ -1 true<\/span><\/code><\/pre>\n<p>\u041f\u043e\u0441\u043b\u0435\u0434\u043d\u044f\u044f \u0441\u0442\u0440\u043e\u043a\u0430 &#8212; \u0433\u0440\u0430\u043d\u0438\u0446\u0430 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">indexOf<\/code>: \u043e\u043d \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0435\u0442 \u0441\u0442\u0440\u043e\u0433\u0438\u043c \u0440\u0430\u0432\u0435\u043d\u0441\u0442\u0432\u043e\u043c, \u0430 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">NaN<\/code> \u043d\u0435 \u0440\u0430\u0432\u0435\u043d \u0441\u0430\u043c \u0441\u0435\u0431\u0435, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">indexOf<\/code> \u0435\u0433\u043e \u043d\u0435 \u043d\u0430\u0445\u043e\u0434\u0438\u0442. <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">includes<\/code> \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442 \u0434\u0440\u0443\u0433\u043e\u0435 \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u0435 (SameValueZero) \u0438 \u043d\u0430\u0445\u043e\u0434\u0438\u0442. \u041e\u0431\u044a\u0435\u043a\u0442\u044b \u043e\u0431\u0430 \u043c\u0435\u0442\u043e\u0434\u0430 \u0438\u0449\u0443\u0442 \u043f\u043e \u0441\u0441\u044b\u043b\u043a\u0435, \u0430 \u043d\u0435 \u043f\u043e \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u043c\u0443: \u0434\u043b\u044f \u043f\u043e\u0438\u0441\u043a\u0430 \u043e\u0431\u044a\u0435\u043a\u0442\u0430 \u043f\u043e \u043f\u043e\u043b\u044e \u043d\u0443\u0436\u0435\u043d <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">find<\/code>.<\/p>\n<h2 id=\"s7\">\u0427\u0430\u0441\u0442\u044b\u0435 \u043e\u0448\u0438\u0431\u043a\u0438: \u043d\u0435\u0432\u0435\u0440\u043d\u043e -&gt; \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 -&gt; \u043a\u0430\u043a \u0438\u0441\u043f\u0440\u0430\u0432\u0438\u0442\u044c<\/h2>\n<p><strong>1. \u0424\u0438\u0433\u0443\u0440\u043d\u044b\u0435 \u0441\u043a\u043e\u0431\u043a\u0438 \u0432 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">map<\/code> \u0431\u0435\u0437 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">return<\/code>.<\/strong><\/p>\n<pre style=\"background:#282c34;color:#abb2bf;border-radius:8px;padding:16px 20px;margin:20px 0;overflow-x:auto;font-size:14px;line-height:1.55;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\"><code style=\"background:none\"><span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">nums<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> [<\/span><span style=\"color: #D19A66\">1<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">2<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">3<\/span><span style=\"color: #ABB2BF\">];<\/span>\n<span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">bad<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">nums<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">map<\/span><span style=\"color: #ABB2BF\">((<\/span><span style=\"color: #E06C75\">n<\/span><span style=\"color: #ABB2BF\">) =&gt; { <\/span><span style=\"color: #E06C75\">n<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">*<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #D19A66\">2<\/span><span style=\"color: #ABB2BF\">; });<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">bad<\/span><span style=\"color: #ABB2BF\">);  <\/span><span style=\"color: #7F848E\">\/\/ [ undefined, undefined, undefined ]<\/span>\n<span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">good<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">nums<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">map<\/span><span style=\"color: #ABB2BF\">((<\/span><span style=\"color: #E06C75\">n<\/span><span style=\"color: #ABB2BF\">) =&gt; <\/span><span style=\"color: #E06C75\">n<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">*<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #D19A66\">2<\/span><span style=\"color: #ABB2BF\">);<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">good<\/span><span style=\"color: #ABB2BF\">); <\/span><span style=\"color: #7F848E\">\/\/ [ 2, 4, 6 ]<\/span><\/code><\/pre>\n<p>\u0421\u0442\u0440\u0435\u043b\u043e\u0447\u043d\u0430\u044f \u0444\u0443\u043d\u043a\u0446\u0438\u044f \u0441 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">{ }<\/code> &#8212; \u044d\u0442\u043e \u0442\u0435\u043b\u043e, \u0438 \u0431\u0435\u0437 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">return<\/code> \u043e\u043d\u0430 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">undefined<\/code>. \u041e\u0448\u0438\u0431\u043a\u0438 \u043d\u0435 \u0431\u0443\u0434\u0435\u0442, \u043f\u0440\u043e\u0441\u0442\u043e \u0442\u0438\u0445\u043e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u0441\u044f \u043c\u0430\u0441\u0441\u0438\u0432 \u0438\u0437 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">undefined<\/code>. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435: \u0443\u0431\u0440\u0430\u0442\u044c \u0441\u043a\u043e\u0431\u043a\u0438 \u0438\u043b\u0438 \u043d\u0430\u043f\u0438\u0441\u0430\u0442\u044c <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">return n * 2;<\/code>. \u0422\u0430 \u0436\u0435 \u043e\u0448\u0438\u0431\u043a\u0430 \u0432 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">filter<\/code> \u0434\u0430\u0435\u0442 \u043f\u0443\u0441\u0442\u043e\u0439 \u043c\u0430\u0441\u0441\u0438\u0432.<\/p>\n<p><strong>2. <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">reduce<\/code> \u043d\u0430 \u043f\u0443\u0441\u0442\u043e\u043c \u043c\u0430\u0441\u0441\u0438\u0432\u0435 \u0431\u0435\u0437 \u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f.<\/strong><\/p>\n<pre style=\"background:#282c34;color:#abb2bf;border-radius:8px;padding:16px 20px;margin:20px 0;overflow-x:auto;font-size:14px;line-height:1.55;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\"><code style=\"background:none\"><span style=\"color: #C678DD\">try<\/span><span style=\"color: #ABB2BF\"> { [].<\/span><span style=\"color: #E06C75\">reduce<\/span><span style=\"color: #ABB2BF\">((<\/span><span style=\"color: #E06C75\">a<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #E06C75\">b<\/span><span style=\"color: #ABB2BF\">) =&gt; <\/span><span style=\"color: #E06C75\">a<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">+<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">b<\/span><span style=\"color: #ABB2BF\">); } <\/span><span style=\"color: #C678DD\">catch<\/span><span style=\"color: #ABB2BF\"> (<\/span><span style=\"color: #E06C75\">e<\/span><span style=\"color: #ABB2BF\">) { <\/span><span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">e<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">name<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">+<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #98C379\">\": \"<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">+<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">e<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">message<\/span><span style=\"color: #ABB2BF\">); }<\/span>\n<span style=\"color: #7F848E\">\/\/ TypeError: Reduce of empty array with no initial value<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">([].<\/span><span style=\"color: #E06C75\">reduce<\/span><span style=\"color: #ABB2BF\">((<\/span><span style=\"color: #E06C75\">a<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #E06C75\">b<\/span><span style=\"color: #ABB2BF\">) =&gt; <\/span><span style=\"color: #E06C75\">a<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">+<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">b<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">0<\/span><span style=\"color: #ABB2BF\">)); <\/span><span style=\"color: #7F848E\">\/\/ 0<\/span><\/code><\/pre>\n<p>\u0411\u0435\u0437 \u0432\u0442\u043e\u0440\u043e\u0433\u043e \u0430\u0440\u0433\u0443\u043c\u0435\u043d\u0442\u0430 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">reduce<\/code> \u0431\u0435\u0440\u0435\u0442 \u043f\u0435\u0440\u0432\u044b\u0439 \u044d\u043b\u0435\u043c\u0435\u043d\u0442 \u043a\u0430\u043a \u0441\u0442\u0430\u0440\u0442\u043e\u0432\u044b\u0439 \u0430\u043a\u043a\u0443\u043c\u0443\u043b\u044f\u0442\u043e\u0440, \u0430 \u043d\u0430 \u043f\u0443\u0441\u0442\u043e\u043c \u043c\u0430\u0441\u0441\u0438\u0432\u0435 \u0431\u0440\u0430\u0442\u044c \u043d\u0435\u0447\u0435\u0433\u043e. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435: \u0432\u0441\u0435\u0433\u0434\u0430 \u043f\u0435\u0440\u0435\u0434\u0430\u0432\u0430\u0442\u044c \u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 (<code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">0<\/code> \u0434\u043b\u044f \u0441\u0443\u043c\u043c\u044b, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">{}<\/code> \u0434\u043b\u044f \u043f\u043e\u0434\u0441\u0447\u0435\u0442\u0430, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">[]<\/code> \u0434\u043b\u044f \u0441\u0431\u043e\u0440\u043a\u0438 \u043c\u0430\u0441\u0441\u0438\u0432\u0430).<\/p>\n<p><strong>3. <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">sort<\/code> \u0431\u0435\u0437 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u044f \u0441\u043e\u0440\u0442\u0438\u0440\u0443\u0435\u0442 \u0447\u0438\u0441\u043b\u0430 \u043a\u0430\u043a \u0441\u0442\u0440\u043e\u043a\u0438.<\/strong><\/p>\n<pre style=\"background:#282c34;color:#abb2bf;border-radius:8px;padding:16px 20px;margin:20px 0;overflow-x:auto;font-size:14px;line-height:1.55;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\"><code style=\"background:none\"><span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">prices<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> [<\/span><span style=\"color: #D19A66\">100<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">25<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">3<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">1000<\/span><span style=\"color: #ABB2BF\">];<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">prices<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">sort<\/span><span style=\"color: #ABB2BF\">());                  <\/span><span style=\"color: #7F848E\">\/\/ [ 100, 1000, 25, 3 ]<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">prices<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">sort<\/span><span style=\"color: #ABB2BF\">((<\/span><span style=\"color: #E06C75\">a<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #E06C75\">b<\/span><span style=\"color: #ABB2BF\">) =&gt; <\/span><span style=\"color: #E06C75\">a<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">-<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">b<\/span><span style=\"color: #ABB2BF\">));   <\/span><span style=\"color: #7F848E\">\/\/ [ 3, 25, 100, 1000 ]<\/span>\n<span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">orig<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> [<\/span><span style=\"color: #D19A66\">100<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">25<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">3<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">1000<\/span><span style=\"color: #ABB2BF\">];<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">orig<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">toSorted<\/span><span style=\"color: #ABB2BF\">((<\/span><span style=\"color: #E06C75\">a<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #E06C75\">b<\/span><span style=\"color: #ABB2BF\">) =&gt; <\/span><span style=\"color: #E06C75\">b<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">-<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">a<\/span><span style=\"color: #ABB2BF\">), <\/span><span style=\"color: #E06C75\">orig<\/span><span style=\"color: #ABB2BF\">); <\/span><span style=\"color: #7F848E\">\/\/ [ 1000, 100, 25, 3 ] [ 100, 25, 3, 1000 ]<\/span><\/code><\/pre>\n<p>\u041f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">sort<\/code> \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b \u043a \u0441\u0442\u0440\u043e\u043a\u0430\u043c \u0438 \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0435\u0442 \u043f\u043e\u0441\u0438\u043c\u0432\u043e\u043b\u044c\u043d\u043e, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">\"1000\"<\/code> \u043e\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u0440\u0430\u043d\u044c\u0448\u0435 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">\"25\"<\/code>. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435: \u0444\u0443\u043d\u043a\u0446\u0438\u044f <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">(a, b) =&gt; a - b<\/code> (\u043f\u043e \u0432\u043e\u0437\u0440\u0430\u0441\u0442\u0430\u043d\u0438\u044e) \u0438\u043b\u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">b - a<\/code> (\u043f\u043e \u0443\u0431\u044b\u0432\u0430\u043d\u0438\u044e). \u0417\u0430\u043e\u0434\u043d\u043e \u043f\u043e\u043c\u043d\u0438\u0442\u0435: <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">sort<\/code> \u043c\u0435\u043d\u044f\u0435\u0442 \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u0439 \u043c\u0430\u0441\u0441\u0438\u0432, \u0430 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">toSorted<\/code> &#8212; \u043d\u0435\u0442.<\/p>\n<p><strong>4. \u0416\u0434\u0430\u0442\u044c \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u043e\u0442 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">forEach<\/code>.<\/strong><\/p>\n<pre style=\"background:#282c34;color:#abb2bf;border-radius:8px;padding:16px 20px;margin:20px 0;overflow-x:auto;font-size:14px;line-height:1.55;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\"><code style=\"background:none\"><span style=\"color: #C678DD\">const<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #E06C75\">r<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">=<\/span><span style=\"color: #ABB2BF\"> [<\/span><span style=\"color: #D19A66\">1<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">2<\/span><span style=\"color: #ABB2BF\">, <\/span><span style=\"color: #D19A66\">3<\/span><span style=\"color: #ABB2BF\">].<\/span><span style=\"color: #E06C75\">forEach<\/span><span style=\"color: #ABB2BF\">((<\/span><span style=\"color: #E06C75\">n<\/span><span style=\"color: #ABB2BF\">) =&gt; <\/span><span style=\"color: #E06C75\">n<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #56B6C2\">*<\/span><span style=\"color: #ABB2BF\"> <\/span><span style=\"color: #D19A66\">2<\/span><span style=\"color: #ABB2BF\">);<\/span>\n<span style=\"color: #E06C75\">console<\/span><span style=\"color: #ABB2BF\">.<\/span><span style=\"color: #E06C75\">log<\/span><span style=\"color: #ABB2BF\">(<\/span><span style=\"color: #E06C75\">r<\/span><span style=\"color: #ABB2BF\">); <\/span><span style=\"color: #7F848E\">\/\/ undefined<\/span><\/code><\/pre>\n<p><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">forEach<\/code> \u043d\u0438\u0447\u0435\u0433\u043e \u043d\u0435 \u0441\u043e\u0431\u0438\u0440\u0430\u0435\u0442, \u043e\u043d \u0442\u043e\u043b\u044c\u043a\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442 \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0435. \u0415\u0441\u043b\u0438 \u043d\u0443\u0436\u0435\u043d \u043d\u043e\u0432\u044b\u0439 \u043c\u0430\u0441\u0441\u0438\u0432 &#8212; \u044d\u0442\u043e <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">map<\/code>. \u041a\u0440\u043e\u043c\u0435 \u0442\u043e\u0433\u043e, \u0438\u0437 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">forEach<\/code> \u043d\u0435\u043b\u044c\u0437\u044f \u0432\u044b\u0439\u0442\u0438 \u0434\u043e\u0441\u0440\u043e\u0447\u043d\u043e \u0447\u0435\u0440\u0435\u0437 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">break<\/code>: \u0434\u043b\u044f \u043f\u0435\u0440\u0435\u0431\u043e\u0440\u0430 \u0441 \u043e\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u043e\u0439 \u0431\u0435\u0440\u0443\u0442 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">for...of<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">find<\/code> \u0438\u043b\u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">some<\/code>.<\/p>\n<h2 id=\"s8\">\u041a\u0430\u043a \u0432\u044b\u0431\u0440\u0430\u0442\u044c \u043c\u0435\u0442\u043e\u0434 \u043f\u043e\u0434 \u0437\u0430\u0434\u0430\u0447\u0443<\/h2>\n<table>\n<thead>\n<tr>\n<th>\u0417\u0430\u0434\u0430\u0447\u0430<\/th>\n<th>\u041c\u0435\u0442\u043e\u0434<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u041f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043d\u043e\u0432\u044b\u0439 \u043c\u0430\u0441\u0441\u0438\u0432 \u0442\u043e\u0439 \u0436\u0435 \u0434\u043b\u0438\u043d\u044b<\/td>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">map<\/code><\/td>\n<\/tr>\n<tr>\n<td>\u041e\u0442\u043e\u0431\u0440\u0430\u0442\u044c \u0447\u0430\u0441\u0442\u044c \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432<\/td>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">filter<\/code><\/td>\n<\/tr>\n<tr>\n<td>\u041f\u043e\u0441\u0447\u0438\u0442\u0430\u0442\u044c \u0441\u0443\u043c\u043c\u0443, \u0441\u043e\u0431\u0440\u0430\u0442\u044c \u043e\u0431\u044a\u0435\u043a\u0442, \u0441\u0433\u0440\u0443\u043f\u043f\u0438\u0440\u043e\u0432\u0430\u0442\u044c<\/td>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">reduce<\/code><\/td>\n<\/tr>\n<tr>\n<td>\u041d\u0430\u0439\u0442\u0438 \u043e\u0434\u0438\u043d \u044d\u043b\u0435\u043c\u0435\u043d\u0442 \u043f\u043e \u0443\u0441\u043b\u043e\u0432\u0438\u044e<\/td>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">find<\/code> (\u043f\u043e\u0437\u0438\u0446\u0438\u044f &#8212; <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">findIndex<\/code>)<\/td>\n<\/tr>\n<tr>\n<td>\u041f\u0440\u043e\u0432\u0435\u0440\u0438\u0442\u044c \u043d\u0430\u043b\u0438\u0447\u0438\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f<\/td>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">includes<\/code><\/td>\n<\/tr>\n<tr>\n<td>\u041f\u0440\u043e\u0432\u0435\u0440\u0438\u0442\u044c \u0443\u0441\u043b\u043e\u0432\u0438\u0435 \u0434\u043b\u044f \u043e\u0434\u043d\u043e\u0433\u043e \/ \u0434\u043b\u044f \u0432\u0441\u0435\u0445<\/td>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">some<\/code> \/ <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">every<\/code><\/td>\n<\/tr>\n<tr>\n<td>\u0414\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u0438\u043b\u0438 \u0443\u0431\u0440\u0430\u0442\u044c \u0441 \u043a\u0440\u0430\u044e<\/td>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">push<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">pop<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">unshift<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">shift<\/code><\/td>\n<\/tr>\n<tr>\n<td>\u0423\u0434\u0430\u043b\u0438\u0442\u044c \u0438\u043b\u0438 \u0432\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u0432 \u0441\u0435\u0440\u0435\u0434\u0438\u043d\u0435<\/td>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">splice<\/code> (\u0431\u0435\u0437 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0438\u0441\u0445\u043e\u0434\u043d\u0438\u043a\u0430 &#8212; <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">toSpliced<\/code>)<\/td>\n<\/tr>\n<tr>\n<td>\u041e\u0442\u0441\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u0430\u0442\u044c<\/td>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">sort<\/code> \u0441 \u0444\u0443\u043d\u043a\u0446\u0438\u0435\u0439 \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u044f (\u043a\u043e\u043f\u0438\u0435\u0439 &#8212; <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">toSorted<\/code>)<\/td>\n<\/tr>\n<tr>\n<td>\u041f\u0440\u043e\u0441\u0442\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0435 \u0434\u043b\u044f \u043a\u0430\u0436\u0434\u043e\u0433\u043e<\/td>\n<td><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">forEach<\/code> \u0438\u043b\u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">for...of<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 id=\"s9\">\u0412\u044b\u0432\u043e\u0434\u044b<\/h2>\n<ul>\n<li>\u0421\u043f\u0438\u0441\u043e\u043a \u0432 JavaScript &#8212; \u044d\u0442\u043e \u043c\u0430\u0441\u0441\u0438\u0432, \u0430 \u00ab\u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u044b \u0441\u043f\u0438\u0441\u043a\u043e\u0432\u00bb &#8212; \u043c\u0435\u0442\u043e\u0434\u044b \u043c\u0430\u0441\u0441\u0438\u0432\u0430, \u0432\u044b\u0437\u044b\u0432\u0430\u0435\u043c\u044b\u0435 \u0447\u0435\u0440\u0435\u0437 \u0442\u043e\u0447\u043a\u0443.<\/li>\n<li>\u0413\u043b\u0430\u0432\u043d\u043e\u0435 \u0440\u0430\u0437\u043b\u0438\u0447\u0438\u0435: \u043c\u0443\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u043c\u0435\u0442\u043e\u0434\u044b (<code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">push<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">splice<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">sort<\/code>) \u043c\u0435\u043d\u044f\u044e\u0442 \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u0439 \u043c\u0430\u0441\u0441\u0438\u0432, \u043e\u0441\u0442\u0430\u043b\u044c\u043d\u044b\u0435 (<code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">map<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">filter<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">reduce<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">find<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">slice<\/code>) \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u044e\u0442 \u043d\u043e\u0432\u044b\u0439 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442.<\/li>\n<li><code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">map<\/code> &#8212; \u0442\u0430 \u0436\u0435 \u0434\u043b\u0438\u043d\u0430, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">filter<\/code> &#8212; \u0447\u0430\u0441\u0442\u044c \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">reduce<\/code> &#8212; \u043e\u0434\u043d\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">find<\/code> &#8212; \u043e\u0434\u0438\u043d \u044d\u043b\u0435\u043c\u0435\u043d\u0442 \u0438\u043b\u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">undefined<\/code>.<\/li>\n<li>\u0422\u0438\u043f\u043e\u0432\u044b\u0435 \u043b\u043e\u0432\u0443\u0448\u043a\u0438: \u043d\u0435\u0442 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">return<\/code> \u0432 \u043a\u043e\u043b\u0431\u044d\u043a\u0435 \u0441 \u0444\u0438\u0433\u0443\u0440\u043d\u044b\u043c\u0438 \u0441\u043a\u043e\u0431\u043a\u0430\u043c\u0438, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">reduce<\/code> \u0431\u0435\u0437 \u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">sort<\/code> \u0431\u0435\u0437 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u044f, \u043e\u0436\u0438\u0434\u0430\u043d\u0438\u0435 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0430 \u043e\u0442 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">forEach<\/code>.<\/li>\n<\/ul>\n<h2 id=\"s10\">\u0413\u0434\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \/ \u0441\u0432\u044f\u0437\u044c \u0441 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u043e\u0439<\/h2>\n<div class=\"oj-cta\" style=\"background:#fbf4e4;border-left:4px solid #c9962b;border-radius:8px;padding:16px 20px;margin:24px 0\">\n<p style=\"margin:0 0 8px\"><strong>\u041e\u0441\u0432\u043e\u0439\u0442\u0435 \u0442\u0435\u043c\u0443 \u043d\u0430 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0435<\/strong><\/p>\n<p>\u041c\u0435\u0442\u043e\u0434\u044b \u043c\u0430\u0441\u0441\u0438\u0432\u043e\u0432 &#8212; \u043f\u043e\u0432\u0441\u0435\u0434\u043d\u0435\u0432\u043d\u044b\u0439 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442 \u0444\u0440\u043e\u043d\u0442\u0435\u043d\u0434\u0430 \u0438 Node.js: \u0432\u044b\u0432\u0435\u0441\u0442\u0438 \u0441\u043f\u0438\u0441\u043e\u043a \u0442\u043e\u0432\u0430\u0440\u043e\u0432 \u0438\u0437 \u043e\u0442\u0432\u0435\u0442\u0430 API (<code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">map<\/code>), \u043e\u0442\u0444\u0438\u043b\u044c\u0442\u0440\u043e\u0432\u0430\u0442\u044c \u043f\u043e \u0446\u0435\u043d\u0435 (<code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">filter<\/code>), \u043f\u043e\u0441\u0447\u0438\u0442\u0430\u0442\u044c \u0441\u0443\u043c\u043c\u0443 \u043a\u043e\u0440\u0437\u0438\u043d\u044b (<code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">reduce<\/code>), \u043d\u0430\u0439\u0442\u0438 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f \u043f\u043e id (<code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">find<\/code>). \u0427\u0442\u043e\u0431\u044b \u0437\u0430\u043a\u0440\u0435\u043f\u0438\u0442\u044c \u0438\u0445 \u043d\u0430 \u0437\u0430\u0434\u0430\u0447\u0430\u0445 \u0441 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u043e\u0439 \u043d\u0430\u0441\u0442\u0430\u0432\u043d\u0438\u043a\u043e\u043c, \u043f\u043e\u0434\u043e\u0439\u0434\u0435\u0442 \u043a\u0443\u0440\u0441 <a href=\"https:\/\/otus.ru\/lessons\/javascript-basic\/?int_article=operatory-spiskov-v-js&amp;int_place=article&amp;int_variant=v1\">\u00abJavaScript-\u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a. \u0411\u0430\u0437\u043e\u0432\u044b\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c\u00bb<\/a>. \u0420\u0430\u0437\u043e\u0431\u0440\u0430\u0442\u044c \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0435 \u0442\u0435\u043c\u044b \u0432\u0436\u0438\u0432\u0443\u044e \u043c\u043e\u0436\u043d\u043e \u043d\u0430 <a href=\"https:\/\/otus.ru\/events\/?int_article=operatory-spiskov-v-js&amp;int_place=article&amp;int_variant=v1\">\u0431\u0435\u0441\u043f\u043b\u0430\u0442\u043d\u044b\u0445 \u043e\u0442\u043a\u0440\u044b\u0442\u044b\u0445 \u0443\u0440\u043e\u043a\u0430\u0445 Otus<\/a>.<\/p>\n<\/div>\n<h2 id=\"s11\">FAQ<\/h2>\n<p><strong>\u0420\u0430\u0431\u043e\u0442\u0430\u044e\u0442 \u043b\u0438 \u043c\u0435\u0442\u043e\u0434\u044b \u043c\u0430\u0441\u0441\u0438\u0432\u043e\u0432 \u043d\u0430 NodeList \u0438\u043b\u0438 \u0441\u0442\u0440\u043e\u043a\u0435?<\/strong><br \/>\n\u041d\u0435 \u0432\u0441\u0435: \u0443 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">NodeList<\/code> \u0435\u0441\u0442\u044c <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">forEach<\/code>, \u043d\u043e \u043d\u0435\u0442 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">map<\/code> \u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">filter<\/code>, \u0443 \u0441\u0442\u0440\u043e\u043a\u0438 \u043d\u0435\u0442 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">map<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">filter<\/code> \u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">forEach<\/code> (\u0441\u0432\u043e\u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">slice<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">includes<\/code>, <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">indexOf<\/code> \u0443 \u043d\u0435\u0435 \u0435\u0441\u0442\u044c, \u043d\u043e \u044d\u0442\u043e \u043c\u0435\u0442\u043e\u0434\u044b \u0441\u0442\u0440\u043e\u043a\u0438). \u041f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u0443\u0439\u0442\u0435 \u0432 \u043c\u0430\u0441\u0441\u0438\u0432 \u0447\u0435\u0440\u0435\u0437 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">Array.from(x)<\/code> \u0438\u043b\u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">[...x]<\/code>, \u0430 \u043f\u043e\u0442\u043e\u043c \u0432\u044b\u0437\u044b\u0432\u0430\u0439\u0442\u0435 \u043d\u0443\u0436\u043d\u044b\u0439 \u043c\u0435\u0442\u043e\u0434.<\/p>\n<p><strong>\u041c\u043e\u0436\u043d\u043e \u043b\u0438 \u043f\u0435\u0440\u0435\u0434\u0430\u0442\u044c \u0432 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">map<\/code> \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u0443\u044e \u0444\u0443\u043d\u043a\u0446\u0438\u044e?<\/strong><br \/>\n\u041c\u043e\u0436\u043d\u043e, \u043d\u043e \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u043e\u043c \u0431\u0443\u0434\u0435\u0442 \u043c\u0430\u0441\u0441\u0438\u0432 \u043f\u0440\u043e\u043c\u0438\u0441\u043e\u0432, \u0430 \u043d\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439. \u0427\u0442\u043e\u0431\u044b \u0434\u043e\u0436\u0434\u0430\u0442\u044c\u0441\u044f \u0432\u0441\u0435\u0445, \u043e\u0431\u0435\u0440\u043d\u0438\u0442\u0435 \u0435\u0433\u043e \u0432 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">await Promise.all(arr.map(async (x) =&gt; ...))<\/code>.<\/p>\n<p><strong>\u0427\u0442\u043e \u0431\u044b\u0441\u0442\u0440\u0435\u0435: \u0446\u0438\u043a\u043b <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">for<\/code> \u0438\u043b\u0438 <code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">map<\/code>\/<code style=\"background:#eef0f3;color:#24292f;border-radius:4px;padding:1px 5px;font-size:0.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace\">filter<\/code>?<\/strong><br \/>\n\u041d\u0430 \u043e\u0431\u044b\u0447\u043d\u044b\u0445 \u043e\u0431\u044a\u0435\u043c\u0430\u0445 \u0440\u0430\u0437\u043d\u0438\u0446\u0430 \u043d\u0435\u0437\u0430\u043c\u0435\u0442\u043d\u0430, \u0430 \u043c\u0435\u0442\u043e\u0434\u044b \u0447\u0438\u0442\u0430\u044e\u0442\u0441\u044f \u043b\u0443\u0447\u0448\u0435. \u0415\u0441\u043b\u0438 \u043c\u0430\u0441\u0441\u0438\u0432 \u043e\u0447\u0435\u043d\u044c \u0431\u043e\u043b\u044c\u0448\u043e\u0439 \u0438 \u043a\u043e\u0434 \u0432 \u0433\u043e\u0440\u044f\u0447\u0435\u043c \u043f\u0443\u0442\u0438, \u0440\u0435\u0448\u0430\u0435\u0442 \u0437\u0430\u043c\u0435\u0440 \u0432 \u0432\u0430\u0448\u0435\u043c \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u0438, \u0430 \u043d\u0435 \u043e\u0431\u0449\u0435\u0435 \u043f\u0440\u0430\u0432\u0438\u043b\u043e.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0412 JavaScript \u00ab\u0441\u043f\u0438\u0441\u043e\u043a\u00bb &#8212; \u044d\u0442\u043e \u043c\u0430\u0441\u0441\u0438\u0432 (Array), \u0430 \u00ab\u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u044b \u0441\u043f\u0438\u0441\u043a\u043e\u0432\u00bb &#8212; \u044d\u0442\u043e \u043c\u0435\u0442\u043e\u0434\u044b \u043c\u0430\u0441\u0441\u0438\u0432\u0430: \u0432\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u044b\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0432\u0440\u043e\u0434\u0435 map, filter, reduce, find, push \u0438 splice, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0432\u044b\u0437\u044b\u0432\u0430\u044e\u0442\u0441\u044f \u0447\u0435\u0440\u0435\u0437 \u0442\u043e\u0447\u043a\u0443 (arr.map(&#8230;)). \u041a\u0440\u0430\u0442\u043a\u043e: \u043e\u0434\u043d\u0438 \u043c\u0435\u0442\u043e\u0434\u044b \u043c\u0435\u043d\u044f\u044e\u0442 \u0441\u0430\u043c \u043c\u0430\u0441\u0441\u0438\u0432 (\u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c, \u0443\u0434\u0430\u043b\u0438\u0442\u044c, \u043e\u0442\u0441\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u0430\u0442\u044c), \u0434\u0440\u0443\u0433\u0438\u0435 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u044e\u0442 \u043d\u043e\u0432\u044b\u0439 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442, \u043d\u0435 \u0442\u0440\u043e\u0433\u0430\u044f \u0438\u0441\u0445\u043e\u0434\u043d\u0438\u043a (\u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u0442\u044c, \u043e\u0442\u0444\u0438\u043b\u044c\u0442\u0440\u043e\u0432\u0430\u0442\u044c, \u043d\u0430\u0439\u0442\u0438, \u043f\u043e\u0441\u0447\u0438\u0442\u0430\u0442\u044c). \u0421\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435 \u0422\u0440\u0438 \u0441\u043b\u043e\u0432\u0430, \u0431\u0435\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043c\u0435\u0442\u043e\u0434\u044b 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