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data-page="{"component":"web/courses/lessons/theory_unit","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":"2026-02-26T17:31:20.479Z","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":"KXrErQF1ocsXf58ui0CYO4jTJ5bmiNbgwY2-3_qjGpLGqw-a8wsMq6E8u7aHT2hMSNoKPO6_KEJ8bSSLqKT9_A","topics":[],"lesson":{"exercise":{"id":4438,"slug":"go_basics_map_structures_exercise","name":null,"state":"active","kind":"exercise","language":"golang","locale":"ru","has_web_view":false,"has_test_view":false,"reviewable":true,"readme":"## solution.go\n\nРеализуйте функцию `UpdateEmail(users map[int]*User, id int, newEmail string) error`, которая обновляет email пользователя с указанным `id` в карте `users`.\n\n- Если пользователь с таким `id` существует, функция должна изменить его `Email` на `newEmail` и вернуть `nil`.\n- Если пользователь не найден, функция должна вернуть ошибку с сообщением `\"user not found\"`.\n\n**Пример использования:**\n\n```go\nusers := map[int]*User{\n\t1: {Name: \"Alice\", Email: \"alice@example.com\"},\n\t2: {Name: \"Bob\", Email: \"bob@example.com\"},\n}\n\nerr := UpdateEmail(users, 1, \"alice@newmail.com\")\nfmt.Println(users[1].Email) // \"alice@newmail.com\"\nfmt.Println(err) // <nil>\n\nerr = UpdateEmail(users, 3, \"charlie@mail.com\")\nfmt.Println(err) // \"user not found\"\n```\n","prepared_readme":"## solution.go\n\nРеализуйте функцию `UpdateEmail(users map[int]*User, id int, newEmail string) error`, которая обновляет email пользователя с указанным `id` в карте `users`.\n\n- Если пользователь с таким `id` существует, функция должна изменить его `Email` на `newEmail` и вернуть `nil`.\n- Если пользователь не найден, функция должна вернуть ошибку с сообщением `\"user not found\"`.\n\n**Пример использования:**\n\n```go\nusers := map[int]*User{\n\t1: {Name: \"Alice\", Email: \"alice@example.com\"},\n\t2: {Name: \"Bob\", Email: \"bob@example.com\"},\n}\n\nerr := UpdateEmail(users, 1, \"alice@newmail.com\")\nfmt.Println(users[1].Email) // \"alice@newmail.com\"\nfmt.Println(err) // <nil>\n\nerr = UpdateEmail(users, 3, \"charlie@mail.com\")\nfmt.Println(err) // \"user not found\"\n```\n","has_solution":true,"entity_name":"Хранение структур в картах"},"units":[{"id":14942,"name":"theory","url":"/courses/go-basics/lessons/map-structures/theory_unit"},{"id":14976,"name":"quiz","url":"/courses/go-basics/lessons/map-structures/quiz_unit"},{"id":14964,"name":"exercise","url":"/courses/go-basics/lessons/map-structures/exercise_unit"}],"links":[],"ordered_units":[{"id":14942,"name":"theory","url":"/courses/go-basics/lessons/map-structures/theory_unit"},{"id":14976,"name":"quiz","url":"/courses/go-basics/lessons/map-structures/quiz_unit"},{"id":14964,"name":"exercise","url":"/courses/go-basics/lessons/map-structures/exercise_unit"}],"id":6381,"slug":"map-structures","state":"approved","name":"Хранение структур в картах","course_order":430,"goal":"Учимся хранить сложные структуры в мапах","self_study":null,"theory_video_provider":null,"theory_video_uid":null,"theory":"Карты (`map`) часто используются для хранения данных, связанных с уникальными ключами. Частый пример — хранение структур (например, пользователей, заказов, товаров), где ключ — это уникальный идентификатор (ID).\n\n## Базовый пример\n\nПредположим, у нас есть структура `User`:\n\n```go\ntype User struct {\n\tName string\n\tEmail string\n}\n```\n\nСоздадим карту, где ключ — целое число (ID), а значение — структура `User`:\n\n```go\nusers := map[int]User{\n\t1: {Name: \"Alice\", Email: \"alice@example.com\"},\n\t2: {Name: \"Bob\", Email: \"bob@example.com\"},\n}\nfmt.Println(users[1]) // => {Alice alice@example.com}\n```\n\n## Проблема копий\n\nПри получении элемента из карты возвращается **копия значения**, а не ссылка на оригинал:\n\n```go\nuser := users[1]\nuser.Name = \"Alicia\"\nfmt.Println(users[1].Name) // => Alice — оригинал не изменился\n```\n\nЧтобы изменить данные в карте, нужно явно присвоить изменённую структуру обратно:\n\n```go\nuser := users[1]\nuser.Name = \"Alicia\"\nusers[1] = user\nfmt.Println(users[1].Name) // => Alicia\n```\n\n## Использование указателей\n\nЕсли нужно часто изменять данные, удобнее хранить в карте **указатели на структуры**:\n\n```go\nusers := map[int]*User{\n\t1: &User{Name: \"Alice\", Email: \"alice@example.com\"},\n\t2: &User{Name: \"Bob\", Email: \"bob@example.com\"},\n}\n\nusers[1].Name = \"Alicia\"\nfmt.Println(users[1].Name) // Alicia — оригинал изменился\n```\n\nВ этом случае карта хранит ссылки на объекты, и изменения применяются напрямую.\n\n## Перебор карты со структурами\n\nПеребор элементов ничем не отличается от обычных карт:\n\n```go\ntype User struct {\n\tName string\n\tEmail string\n}\n\nusers := map[int]*User{\n\t1: &User{Name: \"Alice\", Email: \"alice@example.com\"},\n\t2: &User{Name: \"Bob\", Email: \"bob@example.com\"},\n}\n\nfor id, user := range users {\n\tfmt.Printf(\"ID=%d, Name=%s\\n\", id, user.Name)\n}\n\n// => ID=1, Name=Alice\n// => ID=2, Name=Bob\n```\n\nЕсли карта хранит указатели, цикл будет работать аналогично, только `user` уже будет указателем.\n"},"lessonMember":null,"courseMember":null,"course":{"start_lesson":{"exercise":null,"units":[{"id":7371,"name":"theory","url":"/courses/go-basics/lessons/intro/theory_unit"}],"links":[],"ordered_units":[{"id":7371,"name":"theory","url":"/courses/go-basics/lessons/intro/theory_unit"}],"id":3315,"slug":"intro","state":"approved","name":"Введение","course_order":100,"goal":"Знакомимся с курсом","self_study":null,"theory_video_provider":null,"theory_video_uid":null,"theory":"Go (также часто его называют Golang) — это современный язык программирования общего назначения с открытым исходным кодом. Он был задуман в первую очередь для того, чтобы легко писать простые и надежные программы, которые эффективно используют многопроцессорные системы с несколькими ядрами.\n\nВ Go очень простой синтаксис, мало синтаксического сахара, строгие правила форматирования, что позволяет на нем писать код, который легко читать и понимать. За счет этого Go имеет достаточно низкий порог входа для новых программистов.\n\nУже из коробки Go имеет набор инструментов для управления зависимостями в коде, тестирования, форматирования и оптимизации кода. Также в нем есть эффективный механизм сборки мусора, который постоянно совершенствуется и оптимизируется.\n\nGo — компилируемый язык, при этом компилятор в нем очень быстрый. Уже на стадии компиляции он позволяет предотвратить большинство ошибок в коде. Также программу, написанную на Go, можно скомпилировать под разные операционные системы, включая Linux, Mac OS, Windows и другие.\n\nВ Go есть такие абстракции данных как структуры, интерфейсы и методы, которые позволяют писать код в объектно-ориентированном стиле. Однако его подход значительно отличается от того, который можно увидеть в Java, PHP или Ruby (но, возможно, в понимании Алана Кея, Go — более ООП-язык, чем другие).\n\nИ, конечно же, главной особенностью Go, благодаря которой он набрал такую популярность, является его модель конкурентного программирования. В языке существуют такие абстракции как горутины и каналы, которые позволяют легко писать конкурентный код, при этом его можно легко масштабировать на несколько ядер процессора.\n\nВ целом Go отлично подходит для системного программирования, инфраструктурных задач и написания высоконагруженных сервисов. Многие современные популярные инструменты, которые широко используются в разных компаниях, написаны на Go, например, Docker, Kubernetes, Prometheus, Terraform, Consul, Grafana и другие. Также многие крупные компании начали использовать Go для перехода на микросервисную архитектуру.\n"},"id":323,"slug":"go-basics","challenges_count":6,"name":"Основы Go","allow_indexing":true,"state":"approved","course_state":"finished","pricing_type":"free","description":"На этом курсе вы изучите основы языка Go. Вы познакомитесь с простыми типами данных, условиями и циклами в Go и узнаете, как объявлять собственные функции и использовать встроенные. Во время обучения вы попрактикуетесь в использовании структур и представлении ООП в Go. Также узнаете о сильной стороне программирования на Go — легковесных потоках и Go-рутинах.\n\nОсвоить язык Go с нуля непросто, поэтому с первых уроков вы начнете выполнять упражнения. Такое сочетание теории и практики в обучении помогут быстрее привыкнуть к основам программирования на Go. Знания из этого курса помогут получить основное представление о Go, его принципах и особенностях.","kind":"basic","updated_at":"2026-02-16T15:07:37.185Z","language":"golang","duration_cache":165360,"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 поиске"],"keywords":[],"lessons_count":36,"cover":"https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MTQ4NTQsInB1ciI6ImJsb2JfaWQifX0=--458a31c8a4346a6716f5e02303db11f909ac5f84/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJwbmciLCJyZXNpemVfdG9fZmlsbCI6WzYwMCw0MDBdfSwicHVyIjoidmFyaWF0aW9uIn19--6067466c2912ca31a17eddee04b8cf2a38c6ad17/image.png"},"recommendedLandings":[{"stack":{"id":63,"slug":"go-web-development","title":"Веб-разработка на 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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 Go</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: Хранение структур в картах</h1><script type="application/ld+json">{"@context":"https://schema.org","@type":"LearningResource","name":"Хранение структур в картах","inLanguage":"ru","isPartOf":{"@type":"LearningResource","name":"Основы Go"},"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>Карты (<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>) часто используются для хранения данных, связанных с уникальными ключами. Частый пример — хранение структур (например, пользователей, заказов, товаров), где ключ — это уникальный идентификатор (ID).</p>
<h2 id="heading-2-1">Базовый пример</h2>
<p>Предположим, у нас есть структура <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">User</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">type User struct {
Name string
Email string
}</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>Создадим карту, где ключ — целое число (ID), а значение — структура <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">User</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">users := map[int]User{
1: {Name: "Alice", Email: "alice@example.com"},
2: {Name: "Bob", Email: "bob@example.com"},
}
fmt.Println(users[1]) // => {Alice alice@example.com}</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>
<h2 id="heading-2-2">Проблема копий</h2>
<p>При получении элемента из карты возвращается <strong>копия значения</strong>, а не ссылка на оригинал:</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">user := users[1]
user.Name = "Alicia"
fmt.Println(users[1].Name) // => Alice — оригинал не изменился</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>Чтобы изменить данные в карте, нужно явно присвоить изменённую структуру обратно:</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">user := users[1]
user.Name = "Alicia"
users[1] = user
fmt.Println(users[1].Name) // => Alicia</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>
<h2 id="heading-2-3">Использование указателей</h2>
<p>Если нужно часто изменять данные, удобнее хранить в карте <strong>указатели на структуры</strong>:</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">users := map[int]*User{
1: &User{Name: "Alice", Email: "alice@example.com"},
2: &User{Name: "Bob", Email: "bob@example.com"},
}
users[1].Name = "Alicia"
fmt.Println(users[1].Name) // Alicia — оригинал изменился</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 случае карта хранит ссылки на объекты, и изменения применяются напрямую.</p>
<h2 id="heading-2-4">Перебор карты со структурами</h2>
<p>Перебор элементов ничем не отличается от обычных карт:</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">type User struct {
Name string
Email string
}
users := map[int]*User{
1: &User{Name: "Alice", Email: "alice@example.com"},
2: &User{Name: "Bob", Email: "bob@example.com"},
}
for id, user := range users {
fmt.Printf("ID=%d, Name=%s\n", id, user.Name)
}
// => ID=1, Name=Alice
// => ID=2, Name=Bob</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 карта хранит указатели, цикл будет работать аналогично, только <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">user</code> уже будет указателем.</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" data-orientation="horizontal" data-include-gap-in-size="true"><div class="m_39bc3463 mantine-Carousel-controls" data-orientation="horizontal"><button class="mantine-focus-auto m_64f58e10 mantine-Carousel-control m_87cf2631 mantine-UnstyledButton-root" type="button" data-inactive="true" data-type="previous" tabindex="-1"><svg viewBox="0 0 15 15" fill="none" xmlns="http://www.w3.org/2000/svg" style="transform:rotate(90deg);width:calc(1rem * var(--mantine-scale));height:calc(1rem * var(--mantine-scale));display:block"><path d="M3.13523 6.15803C3.3241 5.95657 3.64052 5.94637 3.84197 6.13523L7.5 9.56464L11.158 6.13523C11.3595 5.94637 11.6759 5.95657 11.8648 6.15803C12.0536 6.35949 12.0434 6.67591 11.842 6.86477L7.84197 10.6148C7.64964 10.7951 7.35036 10.7951 7.15803 10.6148L3.15803 6.86477C2.95657 6.67591 2.94637 6.35949 3.13523 6.15803Z" fill="currentColor" fill-rule="evenodd" clip-rule="evenodd"></path></svg></button><button class="mantine-focus-auto m_64f58e10 mantine-Carousel-control m_87cf2631 mantine-UnstyledButton-root" type="button" data-inactive="true" data-type="next" tabindex="-1"><svg viewBox="0 0 15 15" fill="none" xmlns="http://www.w3.org/2000/svg" style="transform:rotate(-90deg);width:calc(1rem * var(--mantine-scale));height:calc(1rem * var(--mantine-scale));display:block"><path d="M3.13523 6.15803C3.3241 5.95657 3.64052 5.94637 3.84197 6.13523L7.5 9.56464L11.158 6.13523C11.3595 5.94637 11.6759 5.95657 11.8648 6.15803C12.0536 6.35949 12.0434 6.67591 11.842 6.86477L7.84197 10.6148C7.64964 10.7951 7.35036 10.7951 7.15803 10.6148L3.15803 6.86477C2.95657 6.67591 2.94637 6.35949 3.13523 6.15803Z" fill="currentColor" fill-rule="evenodd" clip-rule="evenodd"></path></svg></button></div><div class="m_a2dae653 mantine-Carousel-viewport" data-type="media"><div class="m_fcd81474 mantine-Carousel-container __m__-_R_2mremqrdub_" data-orientation="horizontal"><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/go-web-development?promo_name=programs_list&promo_position=course&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">1 месяц</span><span class="mantine-focus-auto 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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/go-basics?promo_name=programs_list&promo_position=course&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">1 месяц</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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mantine-Group-root"><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">14 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">DevOps-инженер с нуля</p><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Полное погружение в DevOps: весь стек от Linux до Kubernetes</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" 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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">Go-разработчик</p><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Изучите Go, работу с БД, HTTP, конкурентность, горутины, многопоточность </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/eyJfcmFpbHMiOnsiZGF0YSI6MzY2MywicHVyIjoiYmxvYl9pZCJ9fQ==--7e08550d68b7c2ad01e51109dfcf0861158d2e58/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJ3ZWJwIiwicmVzaXplX3RvX2xpbWl0IjpbNDAwLDQwMF0sInNhdmVyIjp7InF1YWxpdHkiOjg1fX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--5b6f46dacd1af664f27558553a58076185091823/Code%20review-amico.png" alt="Go-разработчик" loading="eager"/></div><div 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