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data-page="{"component":"web/qna/questions/show","props":{"errors":{},"locale":"ru","language":"ru","httpsHost":"https://ru.hexlet.io","host":"ru.hexlet.io","colorScheme":"light","auth":{"user":{"id":null,"last_viewed_notification_id":null,"email":null,"state":null,"first_name":"","last_name":"","created_at":"2026-02-26T15:16:01.031Z","current_program":null,"current_team":null,"full_name":"","guest":true,"can_use_paid_features":false,"is_hexlet_employee":false,"sanitized_phone_number":"","can_subscribe":true,"can_renew_education":false}},"cloudflareTurnstileSiteKey":"0x4AAAAAAA15KmeFXzd2H0Xo","vkIdClientId":"51586979","yandexIdClientId":"88d071f1d3384eb4bd1deb37910235c7","formAuthToken":"gRG26WK9KMcYQOjBQjwjOrH0Una0O2Sg3QfrClfLoVJuwH3ekMOFp64DzFlOM9NNcf1_3LwMmgJg53FeBcxGPA","category":{"id":2,"title":"JavaScript","slug":"javascript","questions_count":852,"locale":"ru"},"mainStackCategory":{"id":2,"name":"Курсы по веб-разработке","slug":"web_development","short_name":"Веб-разработка","order":190,"state":"published","category_slug":"courses_web_development"},"answerDto":{"id":null,"body":"","meta":{"model":"question_answer","relations":{}}},"question":{"creator":{"id":113557,"email":"fakesupp@gmail.com","first_name":"Andrey","last_name":"Moshkov","telegram":"amshk","full_name":"Andrey Moshkov","removed":false},"category":{"id":2,"title":"JavaScript","slug":"javascript","questions_count":852,"locale":"ru"},"tags":[{"id":927,"slug":"js-metody","name":"js методы"}],"id":2269,"answers_count":1,"slug":"kakie-byvayut-perebirayuschie-metody-dlya-massivov-v-js","state":"published","title":"Какие бывают перебирающие методы для массивов в js?\r","created_at":"2022-11-18T09:08:46.658Z","details":null,"best_answer_id":1420,"related_stacks_count":5},"answers":[{"user":{"id":206773,"email":"andrey2gri@gmail.com","first_name":"Andrey","last_name":"G","telegram":"","full_name":"Andrey G","removed":false},"question":{"creator":{"id":113557,"email":"fakesupp@gmail.com","first_name":"Andrey","last_name":"Moshkov","telegram":"amshk","full_name":"Andrey Moshkov","removed":false},"category":{"id":2,"title":"JavaScript","slug":"javascript","questions_count":852,"locale":"ru"},"tags":[{"id":927,"slug":"js-metody","name":"js методы"}],"id":2269,"answers_count":1,"slug":"kakie-byvayut-perebirayuschie-metody-dlya-massivov-v-js","state":"published","title":"Какие бывают перебирающие методы для массивов в js?\r","created_at":"2022-11-18T09:08:46.658Z","details":null,"best_answer_id":1420,"related_stacks_count":5},"id":1420,"state":"active","body":"### map\r\nМетод ```.map``` проходит по массиву, выполняя необходимые преобразования каждого элемента. \r\nВозвращает новый преобразованный массив такого же размера, что и исходный.\r\n```javascript\r\nconst letters = ['a', 'b', 'c', 'd'];\r\nconst upperLetters = letters.map((letter) => letter.toUpperCase());\r\n\r\nconsole.log(upperLetters); // => ['A', 'B', 'C', 'D']\r\n```\r\n[Отображение (map)](https://ru.hexlet.io/courses/js-functions/lessons/map/theory_unit)\r\n\r\n### filter \r\nМетод ```.filter``` отбирает из массива элементы, удовлетворяющие нашим критериям. В качестве параметра метод принимает функцию-предикант в которой описываются критерии для отбора. Переданная функция должна возвращать ```true``` или ```false```. \r\n```.filter``` возвращает новый массив с элементами, которые прошли проверку. Если ни один элемент не прошёл проверку, то будет возвращён пустой массив.\r\n```javascript\r\nconst numbers = [10, 2, 3, 5, 9, 0, 7, 4];\r\nconst filteredNumbres = numbers.filter((n) => n >= 5 && n < 10);\r\n\r\nconsole.log(filteredNumbres); // => [5, 9, 7]\r\n```\r\n[Фильтрация (filter)](https://ru.hexlet.io/courses/js-functions/lessons/filter/theory_unit)\r\n\r\n### reduce \r\nМетод ```.reduce``` применяется, когда нужно вычислить значение на основании набора данных.\r\nРезультатом работы метода может быть любой тип данных, как примитивный, так и составной.\r\n```javascript\r\nconst numbers = [10, 2, 3, 5, 9, 0, 7, 11];\r\nconst sum = numbers.reduce((acc, n) => acc + n, 0);\r\n\r\nconsole.log(sum); // => 47\r\n```\r\n\r\n```javascript\r\nconst fruits = ['apples', 'bananas', 'oranges', 'apples', 'kiwi', 'apples'];\r\n\r\nconst fruitsCount = fruits.reduce((acc, fruit) => {\r\n const value = (acc[fruit] ?? 0) + 1;\r\n return {...acc, [fruit]: value};\r\n}, {});\r\n\r\nconsole.log(fruitsCount); // => {apples: 3, bananas: 1, oranges: 1, kiwi: 1}\r\n```\r\n[Агрегация (reduce)](https://ru.hexlet.io/courses/js-functions/lessons/reduce/theory_unit)\r\n\r\n### some\r\nМетод ```.some()``` перебирает исходный массив и возвращает true, если хотя бы один из элементов массива удовлетворяет нашему условию.\r\n```javascript\r\nconst numbers = [10, 2, 3, 5, 9, 0, 7, 4];\r\nconst isEven = (n) => n % 2 === 0;\r\n \r\nconsole.log(numbers.some(isEven)); // => true\r\n```\r\n### every\r\nМетод ```.every()``` очень похож на .some(), но в отличие от первого возвращает true, только в том случае, если каждый элемент массива удовлетворяет нашему условию.\r\n```javascript\r\nconst numbers = [10, 2, 3, 5, 9, 0, 7, 4];\r\nconst isEven = (n) => n % 2 === 0;\r\n \r\nconsole.log(numbers.every(isEven)); // => false\r\n```\r\n```javascript\r\nconst numbers = [10, 8, 20, 54, 92, 2, 72, 4];\r\nconst isEven = (n) => n % 2 === 0;\r\n \r\nconsole.log(numbers.every(isEven)); // => true\r\n```\r\n### includes\r\nМетод ```.includes()``` можно использовать для проверки массива на наличие каких-либо элементов.\r\n```javascript\r\nconst fruits = ['apples', 'bananas', 'oranges'];\r\n \r\nconsole.log(fruits.includes('oranges')); // => true\r\nconsole.log(fruits.includes('kiwi')); // => false\r\n```","votes_up_count":0,"votes_down_count":0,"created_at":"2022-12-10T14:37:04.352Z","user_id":206773,"category_slug":"javascript"}],"relatedQuestions":[{"creator":{"id":363630,"email":"a.agaphonov@ya.ru","first_name":"Человек-Молекула","last_name":"","telegram":null,"full_name":"Человек-Молекула","removed":false},"category":{"id":2,"title":"JavaScript","slug":"javascript","questions_count":852,"locale":"ru"},"tags":[],"id":1359,"answers_count":1,"slug":"kak-sdelat-drag-and-drop-javascript","state":"published","title":"Как сделать drag and drop 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В качестве параметра метод принимает функцию-предикант в которой описываются критерии для отбора. Переданная функция должна возвращать ```true``` или ```false```. \r\n```.filter``` возвращает новый массив с элементами, которые прошли проверку. Если ни один элемент не прошёл проверку, то будет возвращён пустой массив.\r\n```javascript\r\nconst numbers = [10, 2, 3, 5, 9, 0, 7, 4];\r\nconst filteredNumbres = numbers.filter((n) => n >= 5 && n < 10);\r\n\r\nconsole.log(filteredNumbres); // => [5, 9, 7]\r\n```\r\n[Фильтрация (filter)](https://ru.hexlet.io/courses/js-functions/lessons/filter/theory_unit)\r\n\r\n### reduce \r\nМетод ```.reduce``` применяется, когда нужно вычислить значение на основании набора данных.\r\nРезультатом работы метода может быть любой тип данных, как примитивный, так и составной.\r\n```javascript\r\nconst numbers = [10, 2, 3, 5, 9, 0, 7, 11];\r\nconst sum = numbers.reduce((acc, n) => acc + n, 0);\r\n\r\nconsole.log(sum); // => 47\r\n```\r\n\r\n```javascript\r\nconst fruits = ['apples', 'bananas', 'oranges', 'apples', 'kiwi', 'apples'];\r\n\r\nconst fruitsCount = fruits.reduce((acc, fruit) => {\r\n const value = (acc[fruit] ?? 0) + 1;\r\n return {...acc, [fruit]: value};\r\n}, {});\r\n\r\nconsole.log(fruitsCount); // => {apples: 3, bananas: 1, oranges: 1, kiwi: 1}\r\n```\r\n[Агрегация (reduce)](https://ru.hexlet.io/courses/js-functions/lessons/reduce/theory_unit)\r\n\r\n### some\r\nМетод ```.some()``` перебирает исходный массив и возвращает true, если хотя бы один из элементов массива удовлетворяет нашему условию.\r\n```javascript\r\nconst numbers = [10, 2, 3, 5, 9, 0, 7, 4];\r\nconst isEven = (n) => n % 2 === 0;\r\n \r\nconsole.log(numbers.some(isEven)); // => true\r\n```\r\n### every\r\nМетод ```.every()``` очень похож на .some(), но в отличие от первого возвращает true, только в том случае, если каждый элемент массива удовлетворяет нашему условию.\r\n```javascript\r\nconst numbers = [10, 2, 3, 5, 9, 0, 7, 4];\r\nconst isEven = (n) => n % 2 === 0;\r\n \r\nconsole.log(numbers.every(isEven)); // => false\r\n```\r\n```javascript\r\nconst numbers = [10, 8, 20, 54, 92, 2, 72, 4];\r\nconst isEven = (n) => n % 2 === 0;\r\n \r\nconsole.log(numbers.every(isEven)); // => true\r\n```\r\n### includes\r\nМетод ```.includes()``` можно использовать для проверки массива на наличие каких-либо элементов.\r\n```javascript\r\nconst fruits = ['apples', 'bananas', 'oranges'];\r\n \r\nconsole.log(fruits.includes('oranges')); // => true\r\nconsole.log(fruits.includes('kiwi')); // => false\r\n```","datePublished":"2022-12-10T14:37:04.352Z","upvoteCount":0,"author":{"@type":"Person","name":"Andrey G"},"url":"https://ru.hexlet.io/qna/javascript/questions/kakie-byvayut-perebirayuschie-metody-dlya-massivov-v-js#answer-1420"}}}</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 type="application/ld+json">{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"position":1,"@type":"ListItem","item":{"@id":"/qna","name":"Вопросы и ответы"}},{"position":2,"@type":"ListItem","item":{"@id":"/qna/javascript/questions","name":"JavaScript"}},{"position":3,"@type":"ListItem","item":{"@id":"/qna/javascript/questions/kakie-byvayut-perebirayuschie-metody-dlya-massivov-v-js","name":"Какие бывают перебирающие методы для массивов в js?\r"}}]}</script><div style="margin-bottom:var(--mantine-spacing-xs)" class="m_8b3717df mantine-Breadcrumbs-root"><a style="--text-fz:var(--mantine-font-size-sm);--text-lh:var(--mantine-line-height-sm);white-space:normal;color:inherit" class="mantine-focus-auto m_849cf0da m_f678d540 mantine-Breadcrumbs-breadcrumb m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-size="sm" data-underline="hover" href="/"><div style="color:inherit" class="m_4451eb3a mantine-Center-root"><svg xmlns="http://www.w3.org/2000/svg" width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-home-link "><path d="M20.085 11.085l-8.085 -8.085l-9 9h2v7a2 2 0 0 0 2 2h4.5"></path><path d="M9 21v-6a2 2 0 0 1 2 -2h2a2 2 0 0 1 1.807 1.143"></path><path d="M20 21a1 1 0 1 0 2 0a1 1 0 1 0 -2 0"></path><path d="M20 16a1 1 0 1 0 2 0a1 1 0 1 0 -2 0"></path><path d="M15 19a1 1 0 1 0 2 0a1 1 0 1 0 -2 0"></path><path d="M21 16l-5 3l5 2"></path></svg></div></a><div class="m_3b8f2208 mantine-Breadcrumbs-separator">/</div><a style="--text-fz:var(--mantine-font-size-sm);--text-lh:var(--mantine-line-height-sm);white-space:normal;color:inherit" class="mantine-focus-auto m_849cf0da m_f678d540 mantine-Breadcrumbs-breadcrumb m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-size="sm" data-underline="hover" href="/qna">Вопросы и ответы</a><div class="m_3b8f2208 mantine-Breadcrumbs-separator">/</div><a style="--text-fz:var(--mantine-font-size-sm);--text-lh:var(--mantine-line-height-sm);white-space:normal;color:inherit" class="mantine-focus-auto m_849cf0da m_f678d540 mantine-Breadcrumbs-breadcrumb m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-size="sm" data-underline="hover" href="/qna/javascript/questions">JavaScript</a><div class="m_3b8f2208 mantine-Breadcrumbs-separator">/</div><p style="--text-fz:var(--mantine-font-size-sm);--text-lh:var(--mantine-line-height-sm);white-space:normal;color:var(--mantine-color-dimmed)" class="mantine-focus-auto m_f678d540 mantine-Breadcrumbs-breadcrumb m_b6d8b162 mantine-Text-root" data-size="sm">Какие бывают перебирающие методы для массивов в js?
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class="mantine-focus-auto m_b6d8b162 mantine-Text-root" data-inherit="true">Andrey Moshkov</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 style="background-color:light-dark(var(--mantine-color-gray-1), var(--mantine-color-dark-6));margin-block:var(--mantine-spacing-xs)" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root"><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:flex-start;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root"><div style="--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;margin-inline-end:auto;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="1.2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-brand-telegram "><path d="M15 10l-4 4l6 6l4 -16l-18 7l4 2l2 6l3 -4"></path></svg></div>Присоединяйтесь к нашему Telegram-сообществу</div></div></button></div><h2 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-1420"><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">0<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/kakie-byvayut-perebirayuschie-metody-dlya-massivov-v-js/answers/1420/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"><h3 id="heading-3-1">map</h3>
<p>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">.map</code> проходит по массиву, выполняя необходимые преобразования каждого элемента.<br/>
<!-- -->Возвращает новый преобразованный массив такого же размера, что и исходный.</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 letters = ['a', 'b', 'c', 'd'];
const upperLetters = letters.map((letter) => letter.toUpperCase());
console.log(upperLetters); // => ['A', 'B', 'C', 'D']</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>
<p><a style="text-decoration:underline" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="https://ru.hexlet.io/courses/js-functions/lessons/map/theory_unit" rel="noopener noreferrer" target="_blank">Отображение (map)</a></p>
<h3 id="heading-3-2">filter</h3>
<p>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">.filter</code> отбирает из массива элементы, удовлетворяющие нашим критериям. В качестве параметра метод принимает функцию-предикант в которой описываются критерии для отбора. Переданная функция должна возвращать <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">true</code> или <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">false</code>.<br/>
<code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">.filter</code> возвращает новый массив с элементами, которые прошли проверку. Если ни один элемент не прошёл проверку, то будет возвращён пустой массив.</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 = [10, 2, 3, 5, 9, 0, 7, 4];
const filteredNumbres = numbers.filter((n) => n >= 5 && n < 10);
console.log(filteredNumbres); // => [5, 9, 7]</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>
<p><a style="text-decoration:underline" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="https://ru.hexlet.io/courses/js-functions/lessons/filter/theory_unit" rel="noopener noreferrer" target="_blank">Фильтрация (filter)</a></p>
<h3 id="heading-3-3">reduce</h3>
<p>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">.reduce</code> применяется, когда нужно вычислить значение на основании набора данных.
Результатом работы метода может быть любой тип данных, как примитивный, так и составной.</p>
<div class="m_5cb1b9c8 mantine-CodeHighlightTabs-root"><div style="--sa-corner-width:0px;--sa-corner-height:0px" class="m_7b14120b mantine-CodeHighlightTabs-filesScrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><div class="m_38d99e51 mantine-CodeHighlightTabs-files"><button class="mantine-focus-auto m_5cac2e62 mantine-CodeHighlightTabs-file m_87cf2631 mantine-UnstyledButton-root" data-active="true" type="button"><span>javascript</span></button><button class="mantine-focus-auto m_5cac2e62 mantine-CodeHighlightTabs-file m_87cf2631 mantine-UnstyledButton-root" type="button"><span>javascript</span></button></div></div></div><div data-orientation="horizontal" class="m_c44ba933 mantine-ScrollArea-scrollbar" data-hidden="true" style="position:absolute;--sa-thumb-width:18px" data-mantine-scrollbar="true"></div><div class="m_c44ba933 mantine-ScrollArea-scrollbar" data-hidden="true" data-orientation="vertical" style="position:absolute;--sa-thumb-height:18px" data-mantine-scrollbar="true"></div></div><div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlightTabs-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlightTabs-controls" data-with-offset="true"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlightTabs-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-CodeHighlightTabs-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-CodeHighlightTabs-pre" data-with-offset="true"><code class="m_5caae6d3 mantine-CodeHighlightTabs-code">const numbers = [10, 2, 3, 5, 9, 0, 7, 11];
const sum = numbers.reduce((acc, n) => acc + n, 0);
console.log(sum); // => 47</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlightTabs-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div></div><p><a style="text-decoration:underline" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="https://ru.hexlet.io/courses/js-functions/lessons/reduce/theory_unit" rel="noopener noreferrer" target="_blank">Агрегация (reduce)</a></p>
<h3 id="heading-3-4">some</h3>
<p>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">.some()</code> перебирает исходный массив и возвращает true, если хотя бы один из элементов массива удовлетворяет нашему условию.</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 = [10, 2, 3, 5, 9, 0, 7, 4];
const isEven = (n) => n % 2 === 0;
console.log(numbers.some(isEven)); // => true</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>
<h3 id="heading-3-5">every</h3>
<p>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">.every()</code> очень похож на .some(), но в отличие от первого возвращает true, только в том случае, если каждый элемент массива удовлетворяет нашему условию.</p>
<div class="m_5cb1b9c8 mantine-CodeHighlightTabs-root"><div style="--sa-corner-width:0px;--sa-corner-height:0px" class="m_7b14120b mantine-CodeHighlightTabs-filesScrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><div class="m_38d99e51 mantine-CodeHighlightTabs-files"><button class="mantine-focus-auto m_5cac2e62 mantine-CodeHighlightTabs-file m_87cf2631 mantine-UnstyledButton-root" data-active="true" type="button"><span>javascript</span></button><button class="mantine-focus-auto m_5cac2e62 mantine-CodeHighlightTabs-file m_87cf2631 mantine-UnstyledButton-root" type="button"><span>javascript</span></button></div></div></div><div data-orientation="horizontal" class="m_c44ba933 mantine-ScrollArea-scrollbar" data-hidden="true" style="position:absolute;--sa-thumb-width:18px" data-mantine-scrollbar="true"></div><div class="m_c44ba933 mantine-ScrollArea-scrollbar" data-hidden="true" data-orientation="vertical" style="position:absolute;--sa-thumb-height:18px" data-mantine-scrollbar="true"></div></div><div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlightTabs-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlightTabs-controls" data-with-offset="true"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlightTabs-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-CodeHighlightTabs-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-CodeHighlightTabs-pre" data-with-offset="true"><code class="m_5caae6d3 mantine-CodeHighlightTabs-code">const numbers = [10, 2, 3, 5, 9, 0, 7, 4];
const isEven = (n) => n % 2 === 0;
console.log(numbers.every(isEven)); // => false</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlightTabs-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div></div><h3 id="heading-3-6">includes</h3>
<p>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">.includes()</code> можно использовать для проверки массива на наличие каких-либо элементов.</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 fruits = ['apples', 'bananas', 'oranges'];
console.log(fruits.includes('oranges')); // => true
console.log(fruits.includes('kiwi')); // => false</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">Andrey G</p></div></div></div></div></div><style 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mantine-Paper-root" data-with-border="true"><div style="--group-gap:calc(0.25rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">10 месяцев</span><span class="mantine-focus-auto m_b6d8b162 mantine-Text-root">·</span><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">С нуля</span></div><p style="margin-bottom:var(--mantine-spacing-sm);font-size:var(--mantine-font-size-h5);font-weight:bold" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Фронтенд-разработчик</p><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Изучите HTML, CSS, JavaScript и React</p><div style="margin-top:auto" class=""><div class="m_4451eb3a mantine-Center-root"><img style="opacity:0.8;width:70%" class="m_9e117634 mantine-Image-root mantine-visible-from-xs" src="https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzcyNywicHVyIjoiYmxvYl9pZCJ9fQ==--2d5cbbf5c3b4a73ae4b2c50632305d78f5872e4d/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJ3ZWJwIiwicmVzaXplX3RvX2xpbWl0IjpbNDAwLDQwMF0sInNhdmVyIjp7InF1YWxpdHkiOjg1fX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--5b6f46dacd1af664f27558553a58076185091823/Programmer-rafiki.png" alt="Фронтенд-разработчик" loading="eager"/></div><div style="--group-gap:var(--mantine-spacing-md);--group-align:end;--group-justify:space-between;--group-wrap:wrap;margin-top:var(--mantine-spacing-xs)" class="m_4081bf90 mantine-Group-root"><p style="font-size:var(--mantine-font-size-xl)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">от 6 792 ₽</p><p style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Посмотреть →</p></div></div></div></a></div></div><div class="m_d98df724 mantine-Carousel-slide" data-orientation="horizontal"><div tabindex="0" style="cursor:pointer;height:100%"><a style="text-decoration:none" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/programs/js-oop?promo_name=programs_list&promo_position=qna_question&promo_creative=catalog_card&promo_type=card" target="_blank"><div style="height:100%" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root" data-with-border="true"><div style="--group-gap:calc(0.25rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">2 месяца</span><span class="mantine-focus-auto m_b6d8b162 mantine-Text-root">·</span><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Для продвинутых</span></div><p 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style="--group-gap:var(--mantine-spacing-md);--group-align:end;--group-justify:space-between;--group-wrap:wrap;margin-top:var(--mantine-spacing-xs)" class="m_4081bf90 mantine-Group-root"><p style="font-size:var(--mantine-font-size-xl)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">от 3 900 ₽</p><p style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Посмотреть →</p></div></div></div></a></div></div><div class="m_d98df724 mantine-Carousel-slide" data-orientation="horizontal"><div tabindex="0" style="cursor:pointer;height:100%"><a style="text-decoration:none" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/programs/js-async?promo_name=programs_list&promo_position=qna_question&promo_creative=catalog_card&promo_type=card" target="_blank"><div style="height:100%" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root" data-with-border="true"><div 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style="cursor:pointer;height:100%"><a style="text-decoration:none" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/programs/typescript?promo_name=programs_list&promo_position=qna_question&promo_creative=catalog_card&promo_type=card" target="_blank"><div style="height:100%" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root" data-with-border="true"><div style="--group-gap:calc(0.25rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">2 месяца</span><span class="mantine-focus-auto m_b6d8b162 mantine-Text-root">·</span><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Для продвинутых</span></div><p 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