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Наверное так быть не должно. ","plain_title":"Копипаста из теории работает для выполнения задания. Наверное так быть не должно. ","creator":{"public_name":"Константин Попко","id":530086,"is_tutor":false},"comments":[{"creator":{"public_name":"Ivan Gagarinov","id":75907,"is_tutor":true},"id":180802,"body":"**Константин Попко(1106д)**, не обязательно. В упражнении нет такой цели, и какие-то задания могут решаться копированием кода и теории.","topic_id":91375}],"communitable":{"parent_entity_name":null,"parent_entity_url":null,"entity_name":"Операции Rest и Spread","entity_url":null,"active":true}},{"id":90184,"title":"Добрый день!\n\nТесты проходят и на просто копипасте из теории: https://ru.hexlet.io/code_reviews/1079976?submission_id=1399555","plain_title":"Добрый день! Тесты проходят и на просто копипасте из теории: https://ru.hexlet.io/codereviews/1079976?submissionid=1399555 ","creator":{"public_name":"Leonid Sviderskii","id":554,"is_tutor":false},"comments":[{"creator":{"public_name":"Maksim Litvinov","id":198906,"is_tutor":true},"id":179158,"body":"Добрый день! Верно, в тестах мы не вызываем функцию вообще без параметров. Это происходит потому, что ошибки типизации выявляются еще до того, как тесты будут запущены. И если вызвать в тестах метод без параметров, то это будет просто не корректный код","topic_id":90184}],"communitable":{"parent_entity_name":null,"parent_entity_url":null,"entity_name":"Операции Rest и Spread","entity_url":null,"active":true}},{"id":99862,"title":"Если в упражнение скопировать функцию из теории, то решение пройдет тесты, хотя оно не является правильным, т.к. функцию из теории можно вызвать без параметров, а по условию задачи первый параметр должен быть обязательным","plain_title":"Если в упражнение скопировать функцию из теории, то решение пройдет тесты, хотя оно не является правильным, т.к. функцию из теории можно вызвать без параметров, а по условию задачи первый параметр должен быть обязательным ","creator":{"public_name":"Александра","id":809449,"is_tutor":false},"comments":[{"creator":{"public_name":"Ivan Gagarinov","id":75907,"is_tutor":true},"id":191493,"body":"**Александра**, спасибо! Поправил.","topic_id":99862}],"communitable":{"parent_entity_name":null,"parent_entity_url":null,"entity_name":"Операции Rest и Spread","entity_url":null,"active":true}},{"id":99861,"title":"Добрый день! В тесте есть вопрос \"Какой тип параметра задает оператор rest?\". Что значит он задает \"Массив с типами, которые ожидаются в массиве\"? Оператор задает тип параметра? Откуда он знает, какие типы ожидаются в массиве? Разве не разработчик должен это указать?","plain_title":"Добрый день! В тесте есть вопрос \"Какой тип параметра задает оператор rest?\". Что значит он задает \"Массив с типами, которые ожидаются в массиве\"? Оператор задает тип параметра? Откуда он знает, какие типы ожидаются в массиве? Разве не разработчик должен это указать? ","creator":{"public_name":"Александра","id":809449,"is_tutor":false},"comments":[{"creator":{"public_name":"Ivan Gagarinov","id":75907,"is_tutor":true},"id":191490,"body":"**Александра**, здравствуйте! Вопрос не совсем правильно составлен. Я его поправил, теперь должно быть более понятно о чем речь. Спасибо, что обратили внимание!","topic_id":99861}],"communitable":{"parent_entity_name":null,"parent_entity_url":null,"entity_name":"Операции Rest и Spread","entity_url":null,"active":true}},{"id":102257,"title":"судя по названию задания Solution.js нужно написать код на JS, а не на TS","plain_title":"судя по названию задания Solution.js нужно написать код на JS, а не на TS ","creator":{"public_name":"Фарид Алиев","id":719274,"is_tutor":false},"comments":[{"creator":{"public_name":"Ivan Gagarinov","id":75907,"is_tutor":true},"id":194405,"body":"**Фарид Алиев**, спасибо, поправил.","topic_id":102257}],"communitable":{"parent_entity_name":null,"parent_entity_url":null,"entity_name":"Операции Rest и Spread","entity_url":null,"active":true}}],"lesson":{"exercise":{"id":2558,"slug":"typescript_basics_rest_spread","name":null,"state":"active","kind":"exercise","language":"javascript","locale":"ru","has_web_view":false,"has_test_view":false,"reviewable":true,"readme":"## solution.ts\n\nОпределите функцию `max()`, которая отличается от примера из урока только тем, что у нее первый параметр обязательный.\n\nНапример:\n\n```typescript\nmax(1,2,3);\nmax(234);\n```\n","prepared_readme":"## solution.ts\n\nОпределите функцию `max()`, которая отличается от примера из урока только тем, что у нее первый параметр обязательный.\n\nНапример:\n\n```typescript\nmax(1,2,3);\nmax(234);\n```\n","has_solution":true,"entity_name":"Операции Rest и Spread"},"units":[{"id":8569,"name":"theory","url":"/courses/typescript-basics/lessons/rest-spread/theory_unit"},{"id":8821,"name":"quiz","url":"/courses/typescript-basics/lessons/rest-spread/quiz_unit"},{"id":8632,"name":"exercise","url":"/courses/typescript-basics/lessons/rest-spread/exercise_unit"}],"links":[],"ordered_units":[{"id":8569,"name":"theory","url":"/courses/typescript-basics/lessons/rest-spread/theory_unit"},{"id":8821,"name":"quiz","url":"/courses/typescript-basics/lessons/rest-spread/quiz_unit"},{"id":8632,"name":"exercise","url":"/courses/typescript-basics/lessons/rest-spread/exercise_unit"}],"id":3797,"slug":"rest-spread","state":"approved","name":"Операции Rest и Spread","course_order":280,"goal":"Учимся использовать операции Rest и Spred в TypeScript","self_study":null,"theory_video_provider":null,"theory_video_uid":null,"theory":"В этом уроке разберем rest- и spread-операторы.\n\n## Rest-оператор\n\nRest-оператор позволяет создавать функции с переменным числом параметров, при этом сворачивать их в массив:\n\n```typescript\nfunction max(...numbers: number[]): number {\n return Math.max(...numbers)\n}\n```\n\nЭтот массив является обычным параметром функции, поэтому ему задается тип в соответствии с ожидаемыми значениями внутри этого массива. Пример с двумя параметрами:\n\n```typescript\nfunction calculate(operation: string, ...numbers: number[]) {\n // Выполняем операцию operation для всех numbers\n}\n```\n\nВ этом смысле rest-оператор в TypeScript ничем не отличается от rest-оператора в JavaScript. А вот со spread-оператором есть одна особенность.\n\n## Spread-оператор\n\nSpread-оператор в функциях — это как rest-оператор наоборот. Он позволяет раскладывать массив на отдельные параметры:\n\n```typescript\nconst numbers = [1, 2, 3]\nMath.max(...numbers)\n```\n\nЕсли функция принимает на вход любое количество аргументов, как в примере выше, то такой код работает без проблем. Но если функция принимает на вход определенное число аргументов, то TypeScript выдаст ошибку компиляции:\n\n```typescript\nfunction sum(a: number, b: number): number {\n return a + b\n}\n\n// Выведенный тип number[] — ноль или больше чисел,\n// а не массив из двух чисел\nconst args = [1, 2]\nsum(...args)\n// A spread argument must either have a tuple type\n// or be passed to a rest parameter.\n```\n\n<!-- [//]: # (TODO - автору: нужно описать код - на что тут обратить внимание?) -->\n\nМассивы в JavaScript изменяемы, поэтому TypeScript не может полагаться на количество элементов в конкретный момент времени. Есть разные способы обойти это ограничение. Но в этой ситуации проще использовать Type Assertion — указание компилятору, что мы точно знаем о коде:\n\n```typescript\nconst args = [1, 2] as const\n```\n\nПодробнее о Type Assertion поговорим в модуле о типах. С его помощью мы явно указываем, что этот массив состоит из двух конкретных значений, которые не поменяются.\n"},"lessonMember":null,"courseMember":null,"course":{"start_lesson":{"exercise":null,"units":[{"id":6484,"name":"theory","url":"/courses/typescript-basics/lessons/intro/theory_unit"}],"links":[{"id":423014,"name":"Профессия Фронтенд-разработчик","url":"https://ru.hexlet.io/programs/frontend"},{"id":423015,"name":"Профессия Node.js-разработчик","url":"https://ru.hexlet.io/programs/backend"},{"id":423016,"name":"Как устроен TypeScript и зачем его используют","url":"https://ru.hexlet.io/blog/posts/vse-chto-nuzhno-znat-novichku-o-typescript-ischerpyvayuschiy-gayd"}],"ordered_units":[{"id":6484,"name":"theory","url":"/courses/typescript-basics/lessons/intro/theory_unit"}],"id":2839,"slug":"intro","state":"approved","name":"Введение","course_order":100,"goal":"Знакомимся с темой и задачами курса","self_study":null,"theory_video_provider":null,"theory_video_uid":null,"theory":"Этот курс поможет вам познакомиться с основами TypeScript — языка программирования, который является надстройкой над JavaScript и позволяет писать более структурированный и надежный код.\n\nКурс включает в себя основные понятия в TypeScript: типизацию, объявление переменных и функций, интерфейсы, классы, наследование и множество других тем. Также в курсе есть практические задания, которые помогут вам применить полученные знания на практике. После окончания курса вы сможете использовать TypeScript для разработки простых приложений и поймете, какие преимущества дает этот язык программирования в сравнении с JavaScript.\n"},"id":275,"slug":"typescript-basics","challenges_count":5,"name":"Основы Typescript","allow_indexing":true,"state":"approved","course_state":"finished","pricing_type":"paid","description":"На этом курсе вы изучите основы языка Typescript. Вы узнаете о работе с ошибками, отладке и импорте модулей. В итоге вы научитесь писать простые программы на Typescript. Знания из этого курса помогут программистам писать более надежный и понятный код. Этот курс подойдет тем, кто хочет изучить новый язык программирования или улучшить свои навыки в Typescript.","kind":"basic","updated_at":"2026-01-20T11:39:47.190Z","language":"javascript","duration_cache":155460,"skills":["Создавать программы, используя основные конструкции языка (условия, циклы, функции и другие)","Составлять программы, состоящие из нескольких модулей","Правильно анализировать ошибки в коде и пользоваться отладочной печатью при их 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{.mantine-hidden-from-lg {display: none !important;}}@media (max-width: 87.99375em) {.mantine-visible-from-xl {display: none !important;}}@media (min-width: 88em) {.mantine-hidden-from-xl {display: none !important;}}</style><div style="position:absolute;top:0rem" class=""></div><div style="max-width:var(--container-size-xl);height:100%;min-height:0rem" class=""><style data-mantine-styles="inline">.__m__-_R_5ub_{--grid-gutter:0rem;}</style><div style="height:100%;min-height:0rem" class="m_410352e9 mantine-Grid-root __m__-_R_5ub_"><div class="m_dee7bd2f mantine-Grid-inner" style="height:100%"><style data-mantine-styles="inline">.__m__-_R_rdub_{--col-flex-grow:auto;--col-flex-basis:91.66666666666667%;--col-max-width:91.66666666666667%;}@media(min-width: 48em){.__m__-_R_rdub_{--col-flex-grow:auto;--col-flex-basis:83.33333333333334%;--col-max-width:83.33333333333334%;}}</style><div style="min-width:0rem;height:100%;min-height:0rem;display:flex" class="m_96bdd299 mantine-Grid-col __m__-_R_rdub_"><style data-mantine-styles="inline">.__m__-_R_6qrdub_{margin-top:0rem;padding-inline:var(--mantine-spacing-xs);width:100%;}@media(min-width: 48em){.__m__-_R_6qrdub_{margin-top:var(--mantine-spacing-xl);width:80%;}}@media(min-width: 62em){.__m__-_R_6qrdub_{padding-inline:var(--mantine-spacing-xl);}}</style><div style="margin-inline:auto;max-width:var(--mantine-breakpoint-xl)" class="__m__-_R_6qrdub_"><div style="color:var(--mantine-color-dimmed)" class="m_4451eb3a mantine-Center-root" data-inline="true"><div style="--ti-size:var(--ti-size-xs);--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;margin-inline-end:calc(0.125rem * var(--mantine-scale));color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent" data-size="xs"><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-lock "><path d="M5 13a2 2 0 0 1 2 -2h10a2 2 0 0 1 2 2v6a2 2 0 0 1 -2 2h-10a2 2 0 0 1 -2 -2v-6"></path><path d="M11 16a1 1 0 1 0 2 0a1 1 0 0 0 -2 0"></path><path d="M8 11v-4a4 4 0 1 1 8 0v4"></path></svg></div><p style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Основы Typescript</p></div><h1 style="--title-fw:var(--mantine-h1-font-weight);--title-lh:var(--mantine-h1-line-height);--title-fz:var(--mantine-h1-font-size);margin-bottom:var(--mantine-spacing-xl)" class="m_8a5d1357 mantine-Title-root" data-order="1">Теория: Операции Rest и Spread</h1><script type="application/ld+json">{"@context":"https://schema.org","@type":"LearningResource","name":"Операции Rest и Spread","inLanguage":"ru","isPartOf":{"@type":"LearningResource","name":"Основы Typescript"},"isAccessibleForFree":"False","hasPart":{"@type":"WebPageElement","isAccessibleForFree":"False","cssSelector":".paywalled"}}</script><div class=""><div style="--alert-color:var(--mantine-color-indigo-light-color);margin-bottom:var(--mantine-spacing-lg);font-size:var(--mantine-font-size-lg)" class="m_66836ed3 mantine-Alert-root" id="mantine-_R_remqrdub_" role="alert" aria-describedby="mantine-_R_remqrdub_-body" aria-labelledby="mantine-_R_remqrdub_-title"><div class="m_a5d60502 mantine-Alert-wrapper"><div class="m_667f2a6a mantine-Alert-icon"><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-rocket "><path d="M4 13a8 8 0 0 1 7 7a6 6 0 0 0 3 -5a9 9 0 0 0 6 -8a3 3 0 0 0 -3 -3a9 9 0 0 0 -8 6a6 6 0 0 0 -5 3"></path><path d="M7 14a6 6 0 0 0 -3 6a6 6 0 0 0 6 -3"></path><path d="M14 9a1 1 0 1 0 2 0a1 1 0 1 0 -2 0"></path></svg></div><div class="m_667c2793 mantine-Alert-body"><div class="m_6a03f287 mantine-Alert-title"><span id="mantine-_R_remqrdub_-title" class="m_698f4f23 mantine-Alert-label">Полный доступ к материалам</span></div><div id="mantine-_R_remqrdub_-body" class="m_7fa78076 mantine-Alert-message"><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:space-between;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root"><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Зарегистрируйтесь и получите доступ к этому и десяткам других курсов</p><a style="--button-height:var(--button-height-xs);--button-padding-x:var(--button-padding-x-xs);--button-fz:var(--mantine-font-size-xs);--button-bg:linear-gradient(45deg, var(--mantine-color-blue-filled) 0%, var(--mantine-color-cyan-filled) 100%);--button-hover:linear-gradient(45deg, var(--mantine-color-blue-filled) 0%, var(--mantine-color-cyan-filled) 100%);--button-color:var(--mantine-color-white);--button-bd:none" class="mantine-focus-auto mantine-active m_77c9d27d mantine-Button-root m_87cf2631 mantine-UnstyledButton-root" data-variant="gradient" data-size="xs" href="/u/new"><span class="m_80f1301b mantine-Button-inner"><span class="m_811560b9 mantine-Button-label">Зарегистрироваться</span></span></a></div></div></div></div></div><div class="paywalled m_d08caa0 mantine-Typography-root"><p>В этом уроке разберем rest- и spread-операторы.</p>
<h2 id="heading-2-1">Rest-оператор</h2>
<p>Rest-оператор позволяет создавать функции с переменным числом параметров, при этом сворачивать их в 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">function max(...numbers: number[]): number {
return Math.max(...numbers)
}</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>Этот массив является обычным параметром функции, поэтому ему задается тип в соответствии с ожидаемыми значениями внутри этого массива. Пример с двумя параметрами:</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">function calculate(operation: string, ...numbers: number[]) {
// Выполняем операцию operation для всех numbers
}</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>В этом смысле rest-оператор в TypeScript ничем не отличается от rest-оператора в JavaScript. А вот со spread-оператором есть одна особенность.</p>
<h2 id="heading-2-2">Spread-оператор</h2>
<p>Spread-оператор в функциях — это как rest-оператор наоборот. Он позволяет раскладывать массив на отдельные параметры:</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]
Math.max(...numbers)</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>Если функция принимает на вход любое количество аргументов, как в примере выше, то такой код работает без проблем. Но если функция принимает на вход определенное число аргументов, то TypeScript выдаст ошибку компиляции:</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">function sum(a: number, b: number): number {
return a + b
}
// Выведенный тип number[] — ноль или больше чисел,
// а не массив из двух чисел
const args = [1, 2]
sum(...args)
// A spread argument must either have a tuple type
// or be passed to a rest parameter.</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>Массивы в JavaScript изменяемы, поэтому TypeScript не может полагаться на количество элементов в конкретный момент времени. Есть разные способы обойти это ограничение. Но в этой ситуации проще использовать Type Assertion — указание компилятору, что мы точно знаем о коде:</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 args = [1, 2] as const</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>Подробнее о Type Assertion поговорим в модуле о типах. С его помощью мы явно указываем, что этот массив состоит из двух конкретных значений, которые не поменяются.</p></div><div style="margin-block:var(--mantine-spacing-xl)" class=""><h2 style="--title-fw:var(--mantine-h2-font-weight);--title-lh:var(--mantine-h2-line-height);--title-fz:var(--mantine-h2-font-size);margin-bottom:var(--mantine-spacing-md)" class="m_8a5d1357 mantine-Title-root" data-order="2">Рекомендуемые программы</h2><style data-mantine-styles="inline">.__m__-_R_2mremqrdub_{--carousel-slide-gap:var(--mantine-spacing-xs);--carousel-slide-size:70%;}@media(min-width: 36em){.__m__-_R_2mremqrdub_{--carousel-slide-gap:var(--mantine-spacing-xl);--carousel-slide-size:50%;}}</style><div style="--carousel-control-size:calc(2.5rem * var(--mantine-scale));--carousel-controls-offset:var(--mantine-spacing-sm);margin-bottom:var(--mantine-spacing-lg);padding-block:var(--mantine-spacing-sm);background:var(--app-color-surface)" class="m_17884d0f mantine-Carousel-root responsiveClassName" 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