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как добавить в конец массива js — Q&A Хекслет
2026-02-26 18:37 Diff
https://ru.hexlet.io/qna/javascript/questions/kak-dobavit-v-konets-massiva-js
Ответы

Чтобы добавить элемент в конец массива в js, можно использовать метод push():
Самый распространенный способ добавить элемент в конец массива - это метод push().
Но добавить элемент в конец можно и другим способом, используя синтаксис обращения к элементу массиву по индексу, то есть квадратные скобки [].
Последний элемента массива arr будет равен arr.at(-1). Элемента же с индексом arr.length изначально не существует. Поэтому нам остаётся только исправить этот недочёт и присвоить этому элементу нужное значение :-)
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веб-разработке&quot;,&quot;slug&quot;:&quot;web_development&quot;,&quot;short_name&quot;:&quot;Веб-разработка&quot;,&quot;order&quot;:190,&quot;state&quot;:&quot;published&quot;,&quot;category_slug&quot;:&quot;courses_web_development&quot;},&quot;answerDto&quot;:{&quot;id&quot;:null,&quot;body&quot;:&quot;&quot;,&quot;meta&quot;:{&quot;model&quot;:&quot;question_answer&quot;,&quot;relations&quot;:{}}},&quot;question&quot;:{&quot;creator&quot;:{&quot;id&quot;:363630,&quot;email&quot;:&quot;a.agaphonov@ya.ru&quot;,&quot;first_name&quot;:&quot;Человек-Молекула&quot;,&quot;last_name&quot;:&quot;&quot;,&quot;telegram&quot;:null,&quot;full_name&quot;:&quot;Человек-Молекула&quot;,&quot;removed&quot;:false},&quot;category&quot;:{&quot;id&quot;:2,&quot;title&quot;:&quot;JavaScript&quot;,&quot;slug&quot;:&quot;javascript&quot;,&quot;questions_count&quot;:852,&quot;locale&quot;:&quot;ru&quot;},&quot;tags&quot;:[{&quot;id&quot;:565,&quot;slug&quot;:&quot;js-massivy&quot;,&quot;name&quot;:&quot;js массивы&quot;}],&quot;id&quot;:45,&quot;answers_count&quot;:2,&quot;slug&quot;:&quot;kak-dobavit-v-konets-massiva-js&quot;,&quot;state&quot;:&quot;published&quot;,&quot;title&quot;:&quot;как добавить в конец массива js&quot;,&quot;created_at&quot;:&quot;2021-10-14T13:13:17.118Z&quot;,&quot;details&quot;:&quot;&quot;,&quot;best_answer_id&quot;:96,&quot;related_stacks_count&quot;:5},&quot;answers&quot;:[{&quot;user&quot;:{&quot;id&quot;:198906,&quot;email&quot;:&quot;litvinovmksm@gmail.com&quot;,&quot;first_name&quot;:&quot;Maksim&quot;,&quot;last_name&quot;:&quot;Litvinov&quot;,&quot;telegram&quot;:&quot;&quot;,&quot;full_name&quot;:&quot;Maksim Litvinov&quot;,&quot;removed&quot;:false},&quot;question&quot;:{&quot;creator&quot;:{&quot;id&quot;:363630,&quot;email&quot;:&quot;a.agaphonov@ya.ru&quot;,&quot;first_name&quot;:&quot;Человек-Молекула&quot;,&quot;last_name&quot;:&quot;&quot;,&quot;telegram&quot;:null,&quot;full_name&quot;:&quot;Человек-Молекула&quot;,&quot;removed&quot;:false},&quot;category&quot;:{&quot;id&quot;:2,&quot;title&quot;:&quot;JavaScript&quot;,&quot;slug&quot;:&quot;javascript&quot;,&quot;questions_count&quot;:852,&quot;locale&quot;:&quot;ru&quot;},&quot;tags&quot;:[{&quot;id&quot;:565,&quot;slug&quot;:&quot;js-massivy&quot;,&quot;name&quot;:&quot;js массивы&quot;}],&quot;id&quot;:45,&quot;answers_count&quot;:2,&quot;slug&quot;:&quot;kak-dobavit-v-konets-massiva-js&quot;,&quot;state&quot;:&quot;published&quot;,&quot;title&quot;:&quot;как добавить в конец массива js&quot;,&quot;created_at&quot;:&quot;2021-10-14T13:13:17.118Z&quot;,&quot;details&quot;:&quot;&quot;,&quot;best_answer_id&quot;:96,&quot;related_stacks_count&quot;:5},&quot;id&quot;:96,&quot;state&quot;:&quot;active&quot;,&quot;body&quot;:&quot;Чтобы добавить элемент в конец массива в js, можно использовать метод `push()`:\r\n\r\n```javascript\r\nconst numbers = [1, 2, 3];\r\n\r\nnumbers.push(4);\r\nconsole.log(numbers); // =&gt; [1, 2, 3, 4]\r\n\r\n// Можно добавить сразу несколько элементов в конец массива\r\n\r\nnumbers.push(5, 6);\r\nconsole.log(numbers); // =&gt; [1, 2, 3, 4, 5, 6]\r\n```&quot;,&quot;votes_up_count&quot;:1,&quot;votes_down_count&quot;:0,&quot;created_at&quot;:&quot;2021-11-11T07:21:49.428Z&quot;,&quot;user_id&quot;:198906,&quot;category_slug&quot;:&quot;javascript&quot;},{&quot;user&quot;:{&quot;id&quot;:394076,&quot;email&quot;:&quot;kirillmarkeyev@mail.ru&quot;,&quot;first_name&quot;:&quot;Кирилл&quot;,&quot;last_name&quot;:&quot;Маркеев&quot;,&quot;telegram&quot;:&quot;kirill_1191&quot;,&quot;full_name&quot;:&quot;Кирилл Маркеев&quot;,&quot;removed&quot;:false},&quot;question&quot;:{&quot;creator&quot;:{&quot;id&quot;:363630,&quot;email&quot;:&quot;a.agaphonov@ya.ru&quot;,&quot;first_name&quot;:&quot;Человек-Молекула&quot;,&quot;last_name&quot;:&quot;&quot;,&quot;telegram&quot;:null,&quot;full_name&quot;:&quot;Человек-Молекула&quot;,&quot;removed&quot;:false},&quot;category&quot;:{&quot;id&quot;:2,&quot;title&quot;:&quot;JavaScript&quot;,&quot;slug&quot;:&quot;javascript&quot;,&quot;questions_count&quot;:852,&quot;locale&quot;:&quot;ru&quot;},&quot;tags&quot;:[{&quot;id&quot;:565,&quot;slug&quot;:&quot;js-massivy&quot;,&quot;name&quot;:&quot;js массивы&quot;}],&quot;id&quot;:45,&quot;answers_count&quot;:2,&quot;slug&quot;:&quot;kak-dobavit-v-konets-massiva-js&quot;,&quot;state&quot;:&quot;published&quot;,&quot;title&quot;:&quot;как добавить в конец массива js&quot;,&quot;created_at&quot;:&quot;2021-10-14T13:13:17.118Z&quot;,&quot;details&quot;:&quot;&quot;,&quot;best_answer_id&quot;:96,&quot;related_stacks_count&quot;:5},&quot;id&quot;:978,&quot;state&quot;:&quot;active&quot;,&quot;body&quot;:&quot;Самый распространенный способ добавить элемент в конец массива - это метод `push()`.\r\n\r\nНо добавить элемент в конец можно и другим способом, используя синтаксис обращения к элементу массиву по индексу, то есть квадратные скобки `[]`.\r\n\r\nПоследний элемента массива `arr` будет равен `arr.at(-1)`. Элемента же с индексом `arr.length` изначально не существует. Поэтому нам остаётся только исправить этот недочёт и присвоить этому элементу нужное значение :-)\r\n\r\n```javascript\r\nconst arr = [1, 3, 5, 7];\r\n\r\narr[arr.length] = &#x27;a&#x27;; // можно добавлять столько элементов, сколько нам нужно\r\narr[arr.length] = &#x27;b&#x27;;\r\narr[arr.length] = &#x27;c&#x27;;\r\n\r\nconsole.log(arr); // =&gt; [1, 3, 5, 7, &#x27;a&#x27;, &#x27;b&#x27;, &#x27;c&#x27;]\r\n```  \r\n &quot;,&quot;votes_up_count&quot;:1,&quot;votes_down_count&quot;:0,&quot;created_at&quot;:&quot;2022-10-19T19:16:11.748Z&quot;,&quot;user_id&quot;:394076,&quot;category_slug&quot;:&quot;javascript&quot;}],&quot;relatedQuestions&quot;:[{&quot;creator&quot;:{&quot;id&quot;:363630,&quot;email&quot;:&quot;a.agaphonov@ya.ru&quot;,&quot;first_name&quot;:&quot;Человек-Молекула&quot;,&quot;last_name&quot;:&quot;&quot;,&quot;telegram&quot;:null,&quot;full_name&quot;:&quot;Человек-Молекула&quot;,&quot;removed&quot;:false},&quot;category&quot;:{&quot;id&quot;:2,&quot;title&quot;:&quot;JavaScript&quot;,&quot;slug&quot;:&quot;javascript&quot;,&quot;questions_count&quot;:852,&quot;locale&quot;:&quot;ru&quot;},&quot;tags&quot;:[{&quot;id&quot;:565,&quot;slug&quot;:&quot;js-massivy&quot;,&quot;name&quot;:&quot;js массивы&quot;}],&quot;id&quot;:33,&quot;answers_count&quot;:1,&quot;slug&quot;:&quot;kak-peredat-massiv-iz-php-v-javascript&quot;,&quot;state&quot;:&quot;published&quot;,&quot;title&quot;:&quot;Как передать массив из php в javascript&quot;,&quot;created_at&quot;:&quot;2021-10-14T13:13:16.802Z&quot;,&quot;details&quot;:&quot;&quot;,&quot;best_answer_id&quot;:2775,&quot;related_stacks_count&quot;:5},{&quot;creator&quot;:{&quot;id&quot;:363630,&quot;email&quot;:&quot;a.agaphonov@ya.ru&quot;,&quot;first_name&quot;:&quot;Человек-Молекула&quot;,&quot;last_name&quot;:&quot;&quot;,&quot;telegram&quot;:null,&quot;full_name&quot;:&quot;Человек-Молекула&quot;,&quot;removed&quot;:false},&quot;category&quot;:{&quot;id&quot;:2,&quot;title&quot;:&quot;JavaScript&quot;,&quot;slug&quot;:&quot;javascript&quot;,&quot;questions_count&quot;:852,&quot;locale&quot;:&quot;ru&quot;},&quot;tags&quot;:[{&quot;id&quot;:565,&quot;slug&quot;:&quot;js-massivy&quot;,&quot;name&quot;:&quot;js массивы&quot;}],&quot;id&quot;:38,&quot;answers_count&quot;:1,&quot;slug&quot;:&quot;kak-sdelat-js-vypadayuschiy-spisok-iz-massiva-localstorage&quot;,&quot;state&quot;:&quot;published&quot;,&quot;title&quot;:&quot;Как сделать js выпадающий список из массива localstorage&quot;,&quot;created_at&quot;:&quot;2021-10-14T13:13:16.903Z&quot;,&quot;details&quot;:&quot;&quot;,&quot;best_answer_id&quot;:1170,&quot;related_stacks_count&quot;:5},{&quot;creator&quot;:{&quot;id&quot;:363630,&quot;email&quot;:&quot;a.agaphonov@ya.ru&quot;,&quot;first_name&quot;:&quot;Человек-Молекула&quot;,&quot;last_name&quot;:&quot;&quot;,&quot;telegram&quot;:null,&quot;full_name&quot;:&quot;Человек-Молекула&quot;,&quot;removed&quot;:false},&quot;category&quot;:{&quot;id&quot;:2,&quot;title&quot;:&quot;JavaScript&quot;,&quot;slug&quot;:&quot;javascript&quot;,&quot;questions_count&quot;:852,&quot;locale&quot;:&quot;ru&quot;},&quot;tags&quot;:[{&quot;id&quot;:565,&quot;slug&quot;:&quot;js-massivy&quot;,&quot;name&quot;:&quot;js массивы&quot;}],&quot;id&quot;:21,&quot;answers_count&quot;:1,&quot;slug&quot;:&quot;kak-sohranit-js-massiv-v-fayl&quot;,&quot;state&quot;:&quot;published&quot;,&quot;title&quot;:&quot;Как сохранить js массив в файл&quot;,&quot;created_at&quot;:&quot;2021-10-14T13:13:16.549Z&quot;,&quot;details&quot;:&quot;&quot;,&quot;best_answer_id&quot;:1064,&quot;related_stacks_count&quot;:5},{&quot;creator&quot;:{&quot;id&quot;:363630,&quot;email&quot;:&quot;a.agaphonov@ya.ru&quot;,&quot;first_name&quot;:&quot;Человек-Молекула&quot;,&quot;last_name&quot;:&quot;&quot;,&quot;telegram&quot;:null,&quot;full_name&quot;:&quot;Человек-Молекула&quot;,&quot;removed&quot;:false},&quot;category&quot;:{&quot;id&quot;:2,&quot;title&quot;:&quot;JavaScript&quot;,&quot;slug&quot;:&quot;javascript&quot;,&quot;questions_count&quot;:852,&quot;locale&quot;:&quot;ru&quot;},&quot;tags&quot;:[{&quot;id&quot;:565,&quot;slug&quot;:&quot;js-massivy&quot;,&quot;name&quot;:&quot;js массивы&quot;}],&quot;id&quot;:13,&quot;answers_count&quot;:2,&quot;slug&quot;:&quot;kak-vychest-massiv-iz-massiva-js&quot;,&quot;state&quot;:&quot;published&quot;,&quot;title&quot;:&quot;Как вычесть массив из массива js &quot;,&quot;created_at&quot;:&quot;2021-10-14T13:13:16.341Z&quot;,&quot;details&quot;:&quot;&quot;,&quot;best_answer_id&quot;:816,&quot;related_stacks_count&quot;:5},{&quot;creator&quot;:{&quot;id&quot;:363630,&quot;email&quot;:&quot;a.agaphonov@ya.ru&quot;,&quot;first_name&quot;:&quot;Человек-Молекула&quot;,&quot;last_name&quot;:&quot;&quot;,&quot;telegram&quot;:null,&quot;full_name&quot;:&quot;Человек-Молекула&quot;,&quot;removed&quot;:false},&quot;category&quot;:{&quot;id&quot;:2,&quot;title&quot;:&quot;JavaScript&quot;,&quot;slug&quot;:&quot;javascript&quot;,&quot;questions_count&quot;:852,&quot;locale&quot;:&quot;ru&quot;},&quot;tags&quot;:[{&quot;id&quot;:565,&quot;slug&quot;:&quot;js-massivy&quot;,&quot;name&quot;:&quot;js массивы&quot;}],&quot;id&quot;:23,&quot;answers_count&quot;:2,&quot;slug&quot;:&quot;kak-poschitat-kolichestvo-odinakovyh-elementov-v-massive-js&quot;,&quot;state&quot;:&quot;published&quot;,&quot;title&quot;:&quot;Как посчитать количество одинаковых элементов в массиве js&quot;,&quot;created_at&quot;:&quot;2021-10-14T13:13:16.591Z&quot;,&quot;details&quot;:&quot;&quot;,&quot;best_answer_id&quot;:775,&quot;related_stacks_count&quot;:5}],&quot;relatedLandings&quot;:[{&quot;stack&quot;:{&quot;id&quot;:12,&quot;slug&quot;:&quot;frontend&quot;,&quot;title&quot;:&quot;Фронтенд-разработчик&quot;,&quot;audience&quot;:&quot;for_beginners&quot;,&quot;start_type&quot;:&quot;weekly&quot;,&quot;pricing_model&quot;:&quot;purchase&quot;,&quot;priority&quot;:&quot;high&quot;,&quot;kind&quot;:&quot;profession&quot;,&quot;state&quot;:&quot;published&quot;,&quot;stack_state&quot;:&quot;finished&quot;,&quot;order&quot;:20,&quot;duration_in_months&quot;:10},&quot;id&quot;:17,&quot;slug&quot;:&quot;frontend&quot;,&quot;title&quot;:&quot;Фронтенд-разработчик&quot;,&quot;subtitle&quot;:&quot;Изучите HTML, CSS, JavaScript и React&quot;,&quot;subtitle_for_lists&quot;:&quot;Изучите HTML, CSS, JavaScript и React&quot;,&quot;locale&quot;:&quot;ru&quot;,&quot;current&quot;:true,&quot;duration_in_months_text&quot;:&quot;10 месяцев&quot;,&quot;stack_slug&quot;:&quot;frontend&quot;,&quot;price_text&quot;:&quot;от 6 792 ₽&quot;,&quot;duration_text&quot;:&quot;10 месяцев&quot;,&quot;cover_list_variant&quot;:&quot;https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzcyNywicHVyIjoiYmxvYl9pZCJ9fQ==--2d5cbbf5c3b4a73ae4b2c50632305d78f5872e4d/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJ3ZWJwIiwicmVzaXplX3RvX2xpbWl0IjpbNDAwLDQwMF0sInNhdmVyIjp7InF1YWxpdHkiOjg1fX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--5b6f46dacd1af664f27558553a58076185091823/Programmer-rafiki.png&quot;},{&quot;stack&quot;:{&quot;id&quot;:20,&quot;slug&quot;:&quot;js-sicp&quot;,&quot;title&quot;:&quot;СИКП на 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месяц&quot;,&quot;cover_list_variant&quot;:&quot;https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6Mzc2MCwicHVyIjoiYmxvYl9pZCJ9fQ==--9348098e4053d798b6f34bee4ef66947540261e4/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJ3ZWJwIiwicmVzaXplX3RvX2xpbWl0IjpbNDAwLDQwMF0sInNhdmVyIjp7InF1YWxpdHkiOjg1fX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--5b6f46dacd1af664f27558553a58076185091823/Low%20code%20development-rafiki.png&quot;},{&quot;stack&quot;:{&quot;id&quot;:29,&quot;slug&quot;:&quot;js-oop&quot;,&quot;title&quot;:&quot;ООП на 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Элемента же с индексом `arr.length` изначально не существует. Поэтому нам остаётся только исправить этот недочёт и присвоить этому элементу нужное значение :-)\r\n\r\n```javascript\r\nconst arr = [1, 3, 5, 7];\r\n\r\narr[arr.length] = &apos;a&apos;; // можно добавлять столько элементов, сколько нам нужно\r\narr[arr.length] = &apos;b&apos;;\r\narr[arr.length] = &apos;c&apos;;\r\n\r\nconsole.log(arr); // =&gt; [1, 3, 5, 7, &apos;a&apos;, &apos;b&apos;, &apos;c&apos;]\r\n```  \r\n ","datePublished":"2022-10-19T19:16:11.748Z","upvoteCount":1,"author":{"@type":"Person","name":"Кирилл Маркеев"},"url":"https://ru.hexlet.io/qna/javascript/questions/kak-dobavit-v-konets-massiva-js#answer-978"}]}}</script><div style="--container-size:var(--container-size-lg);margin-top:var(--mantine-spacing-xl);height:100%" class="m_7485cace mantine-Container-root" data-size="lg" data-strategy="block"><script 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15h1"></path><path d="M12 15v3"></path></svg><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root" data-inherit="true">4 года назад</p></div><div style="--group-gap:calc(0.25rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-user "><path d="M8 7a4 4 0 1 0 8 0a4 4 0 0 0 -8 0"></path><path d="M6 21v-2a4 4 0 0 1 4 -4h4a4 4 0 0 1 4 4v2"></path></svg><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root" data-inherit="true">Человек-Молекула</p></div></div><div role="link" tabindex="0" style="cursor:pointer"><button style="display:block;width:100%" class="mantine-focus-auto m_87cf2631 mantine-UnstyledButton-root" type="button" aria-label="Присоединяйтесь к нашему Telegram-сообществу"><div 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style="--title-fw:var(--mantine-h2-font-weight);--title-lh:var(--mantine-h2-line-height);--title-fz:var(--mantine-h2-font-size);margin-block:var(--mantine-spacing-xl)" class="m_8a5d1357 mantine-Title-root" data-order="2">Ответы</h2><div style="margin-bottom:var(--mantine-spacing-xl);padding:var(--mantine-spacing-lg)" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root" data-with-border="true" id="answer-96"><div style="--group-gap:calc(1.125rem * var(--mantine-scale));--group-align:stretch;--group-justify:flex-start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><div style="--stack-gap:var(--mantine-spacing-md);--stack-align:stretch;--stack-justify:flex-start;font-size:var(--mantine-font-size-h1);font-weight:lighter;text-align:center" class="m_6d731127 mantine-Stack-root">1<a style="color:inherit" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/qna/javascript/questions/kak-dobavit-v-konets-massiva-js/answers/96/vote"><div style="--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-thumb-up "><path d="M7 11v8a1 1 0 0 1 -1 1h-2a1 1 0 0 1 -1 -1v-7a1 1 0 0 1 1 -1h3a4 4 0 0 0 4 -4v-1a2 2 0 0 1 4 0v5h3a2 2 0 0 1 2 2l-1 5a2 3 0 0 1 -2 2h-7a3 3 0 0 1 -3 -3"></path></svg></div></a><div style="--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-check "><path d="M5 12l5 5l10 -10"></path></svg></div></div><div style="--stack-gap:var(--mantine-spacing-md);--stack-align:stretch;--stack-justify:flex-start;width:100%;min-width:0rem" class="m_6d731127 mantine-Stack-root"><div style="margin-bottom:auto" class="m_d08caa0 mantine-Typography-root"><p>Чтобы добавить элемент в конец массива в js, можно использовать метод <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">push()</code>:</p>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">const numbers = [1, 2, 3];

numbers.push(4);
console.log(numbers); // =&gt; [1, 2, 3, 4]

// Можно добавить сразу несколько элементов в конец массива

numbers.push(5, 6);
console.log(numbers); // =&gt; [1, 2, 3, 4, 5, 6]</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div></div><div class="m_3eebeb36 mantine-Divider-root" data-orientation="horizontal" role="separator"></div><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:flex-start;--group-wrap:wrap;font-size:var(--mantine-font-size-sm)" class="m_4081bf90 mantine-Group-root"><div style="--group-gap:var(--mantine-spacing-xs);--group-align:center;--group-justify:flex-start;--group-wrap:wrap;margin-inline-start:auto" class="m_4081bf90 mantine-Group-root"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-calendar "><path d="M4 7a2 2 0 0 1 2 -2h12a2 2 0 0 1 2 2v12a2 2 0 0 1 -2 2h-12a2 2 0 0 1 -2 -2v-12"></path><path d="M16 3v4"></path><path d="M8 3v4"></path><path d="M4 11h16"></path><path d="M11 15h1"></path><path d="M12 15v3"></path></svg><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root" data-inherit="true">4 года назад</p></div><div style="--group-gap:var(--mantine-spacing-xs);--group-align:center;--group-justify:flex-start;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-user "><path d="M8 7a4 4 0 1 0 8 0a4 4 0 0 0 -8 0"></path><path d="M6 21v-2a4 4 0 0 1 4 -4h4a4 4 0 0 1 4 4v2"></path></svg><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root" data-inherit="true">Maksim Litvinov</p></div></div></div></div></div><div style="margin-bottom:var(--mantine-spacing-xl);padding:var(--mantine-spacing-lg)" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root" data-with-border="true" id="answer-978"><div style="--group-gap:calc(1.125rem * var(--mantine-scale));--group-align:stretch;--group-justify:flex-start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><div style="--stack-gap:var(--mantine-spacing-md);--stack-align:stretch;--stack-justify:flex-start;font-size:var(--mantine-font-size-h1);font-weight:lighter;text-align:center" class="m_6d731127 mantine-Stack-root">1<a style="color:inherit" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/qna/javascript/questions/kak-dobavit-v-konets-massiva-js/answers/978/vote"><div style="--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-thumb-up "><path d="M7 11v8a1 1 0 0 1 -1 1h-2a1 1 0 0 1 -1 -1v-7a1 1 0 0 1 1 -1h3a4 4 0 0 0 4 -4v-1a2 2 0 0 1 4 0v5h3a2 2 0 0 1 2 2l-1 5a2 3 0 0 1 -2 2h-7a3 3 0 0 1 -3 -3"></path></svg></div></a></div><div style="--stack-gap:var(--mantine-spacing-md);--stack-align:stretch;--stack-justify:flex-start;width:100%;min-width:0rem" class="m_6d731127 mantine-Stack-root"><div style="margin-bottom:auto" class="m_d08caa0 mantine-Typography-root"><p>Самый распространенный способ добавить элемент в конец массива - это метод <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">push()</code>.</p>
<p>Но добавить элемент в конец можно и другим способом, используя синтаксис обращения к элементу массиву по индексу, то есть квадратные скобки <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">[]</code>.</p>
<p>Последний элемента массива <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">arr</code> будет равен <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">arr.at(-1)</code>. Элемента же с индексом <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">arr.length</code> изначально не существует. Поэтому нам остаётся только исправить этот недочёт и присвоить этому элементу нужное значение :-)</p>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">const arr = [1, 3, 5, 7];

arr[arr.length] = &#x27;a&#x27;; // можно добавлять столько элементов, сколько нам нужно
arr[arr.length] = &#x27;b&#x27;;
arr[arr.length] = &#x27;c&#x27;;

console.log(arr); // =&gt; [1, 3, 5, 7, &#x27;a&#x27;, &#x27;b&#x27;, &#x27;c&#x27;]</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div></div><div class="m_3eebeb36 mantine-Divider-root" data-orientation="horizontal" role="separator"></div><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:flex-start;--group-wrap:wrap;font-size:var(--mantine-font-size-sm)" class="m_4081bf90 mantine-Group-root"><div style="--group-gap:var(--mantine-spacing-xs);--group-align:center;--group-justify:flex-start;--group-wrap:wrap;margin-inline-start:auto" class="m_4081bf90 mantine-Group-root"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-calendar "><path d="M4 7a2 2 0 0 1 2 -2h12a2 2 0 0 1 2 2v12a2 2 0 0 1 -2 2h-12a2 2 0 0 1 -2 -2v-12"></path><path d="M16 3v4"></path><path d="M8 3v4"></path><path d="M4 11h16"></path><path d="M11 15h1"></path><path d="M12 15v3"></path></svg><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root" data-inherit="true">3 года назад</p></div><div style="--group-gap:var(--mantine-spacing-xs);--group-align:center;--group-justify:flex-start;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-user "><path d="M8 7a4 4 0 1 0 8 0a4 4 0 0 0 -8 0"></path><path d="M6 21v-2a4 4 0 0 1 4 -4h4a4 4 0 0 1 4 4v2"></path></svg><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root" data-inherit="true">Кирилл Маркеев</p></div></div></div></div></div><style 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