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<link rel="preload" as="image" href="/vite/assets/blog_post-7eTyeLLt.webp"/><link rel="preload" as="image" href="/vite/assets/development-BVihs_d5.png"/><div id="app" data-page="{"component":"web/blog/posts/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":"2026-02-26T23:26:26.146Z","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":"M02GlIFqjr0dcBeIg_ZGhDBmnDPDBTi3gtBIfa6Mf_ncnE2jcxQj3aszMxCP-bbz8G-xmcsyxhU_MNIp_IuYlw","post":{"model_name":"BlogPost","category":{"id":14,"name":"Дневник студента","slug":"student-diary","state":"published","created_at":"2019-02-25T13:27:09.471Z"},"creator":{"public_name":"Artyom Ganev","id":5328,"is_tutor":false},"tags":[],"id":627,"title":"Упрощённое использование библиотеки classnames","slug":"uproschyonnoe-ispolzovanie-biblioteki-classnames","state":"published","summary":"Небольшая оптимизация использования библиотеки classnames.","votes_count":3,"created_at":"2020-01-17T07:02:51.055Z","published_at":"2020-01-17T08:59:46.477Z","body":"В уроках по [React](https://ru.hexlet.io/courses/js-react) довольно часто приходится использовать библиотеку [classnames](https://www.npmjs.com/package/classnames).\r\n\r\nВо всех примерах и решениях учителя мне попадался такой вариант использования:\r\n```\r\nconst className = cn({\r\n class1: true,\r\n class2: условие,\r\n class3: условие,\r\n});\r\n```\r\nНо, если class1 нужен всегда, то нет смысла писать true, можно написать вот так:\r\n```\r\nconst className = cn(\r\n 'class1', {\r\n class2: условие,\r\n class3: условие\r\n});\r\n```\r\n\r\nНа самом деле вариантов использования этой утилиты гораздо больше, поэтому рекомендую ознакомиться с [документацией](https://github.com/JedWatson/classnames).","reading_time":0,"url":"https://ru.hexlet.io/blog/posts/uproschyonnoe-ispolzovanie-biblioteki-classnames","cover_thumb_variant":null,"cover_list_variant":"/vite/assets/blog_post-7eTyeLLt.webp","cover_main_variant":"/vite/assets/blog_post-7eTyeLLt.webp","related_stacks_count":5},"relatedPosts":[{"model_name":"BlogPost","id":622,"title":"Frontend. 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Начало пути","slug":"frontend-nachalo-puti","summary":"Вот и отгремели новогодние праздники, да уж, из-за подготовки к ним не успел написать о том, как я прошел пару курсов по введению в программирование. 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style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:space-between;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root __m__-_R_eub_"><style data-mantine-styles="inline">.__m__-_R_deub_{width:100%;}@media(min-width: 36em){.__m__-_R_deub_{width:70%;}}@media(min-width: 75em){.__m__-_R_deub_{width:75%;}}</style><div class="__m__-_R_deub_"><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><h1 style="--title-fw:var(--mantine-h1-font-weight);--title-lh:var(--mantine-h1-line-height);--title-fz:var(--mantine-h1-font-size)" class="m_8a5d1357 mantine-Title-root" data-order="1">Упрощённое использование библиотеки classnames</h1></div></div></div><div style="position:absolute;top:calc(18.75rem * var(--mantine-scale))" class=""></div><style data-mantine-styles="inline">.__m__-_R_2iub_{--grid-gutter:var(--mantine-spacing-xl);}</style><div class="m_410352e9 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style="--group-gap:calc(0.1875rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:wrap;margin-inline-end:var(--mantine-spacing-lg)" class="m_4081bf90 mantine-Group-root">17 января 2020 г.</div><div style="--group-gap:calc(0.1875rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root"><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;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-clock "><path d="M3 12a9 9 0 1 0 18 0a9 9 0 0 0 -18 0"></path><path d="M12 7v5l3 3"></path></svg></div>0 минут</div><div style="--group-gap:calc(0.1875rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root"><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;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-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>3</div></div><div style="--ar-ratio:2" class="m_71ac47fc mantine-AspectRatio-root"><img style="--image-radius:var(--mantine-radius-md);--image-object-fit:cover;width:100%;height:100%" class="m_9e117634 mantine-Image-root" src="/vite/assets/blog_post-7eTyeLLt.webp" alt="Упрощённое использование библиотеки classnames"/></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))" 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><div style="margin-bottom:var(--mantine-spacing-xl)" class="m_d08caa0 mantine-Typography-root"><p>В уроках по <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-react" rel="noopener noreferrer" target="_blank">React</a> довольно часто приходится использовать библиотеку <a style="text-decoration:underline" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="https://www.npmjs.com/package/classnames" rel="noopener noreferrer" target="_blank">classnames</a>.</p>
<p>Во всех примерах и решениях учителя мне попадался такой вариант использования:</p>
<code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">const className = cn({
class1: true,
class2: условие,
class3: условие,
});</code>
<p>Но, если class1 нужен всегда, то нет смысла писать true, можно написать вот так:</p>
<code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">const className = cn(
'class1', {
class2: условие,
class3: условие
});</code>
<p>На самом деле вариантов использования этой утилиты гораздо больше, поэтому рекомендую ознакомиться с <a style="text-decoration:underline" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="https://github.com/JedWatson/classnames" rel="noopener noreferrer" target="_blank">документацией</a>.</p></div><div class=""><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:space-between;--group-wrap:wrap;margin-bottom:var(--mantine-spacing-lg)" class="m_4081bf90 mantine-Group-root"><div 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:var(--mantine-spacing-xs);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-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></div><p style="margin-inline-end:var(--mantine-spacing-xl)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Artyom Ganev</p><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root">6 лет назад</p></div><div style="align-items:center" class="m_8bffd616 mantine-Flex-root __m__-_R_5dirddmiub_"><a style="display:inline-flex" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/blog/posts/uproschyonnoe-ispolzovanie-biblioteki-classnames/votes"><div style="--ti-size:var(--ti-size-sm);--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;margin-inline-end:var(--mantine-spacing-xs);color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent" data-size="sm"><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><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root">3</p></div></div></div><div style="background-color:var(--mantine-color-indigo-light);border:calc(0.0625rem * var(--mantine-scale)) solid transparent;padding:var(--mantine-spacing-xl)" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root"><p style="margin-bottom:var(--mantine-spacing-sm);font-size:var(--mantine-font-size-h4)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Читайте также:</p><ul style="margin-inline-start:var(--mantine-spacing-lg)" class="m_abbac491 mantine-List-root"><li style="margin-bottom:var(--mantine-spacing-sm)" class="m_abb6bec2 mantine-List-item" data-with-icon="true"><div class="m_75cd9f71 mantine-List-itemWrapper"><span class="m_60f83e5b mantine-List-itemIcon"><div class="m_4451eb3a mantine-Center-root"><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;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-chevron-compact-right "><path d="M11 4l3 8l-3 8"></path></svg></div></div></span><span class="mantine-List-itemLabel"><a style="color:inherit" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/blog/posts/frontend-na-pol-puti-k-pervomu-proektu">Frontend. На пол пути к первому проекту</a></span></div></li><li style="margin-bottom:var(--mantine-spacing-sm)" class="m_abb6bec2 mantine-List-item" data-with-icon="true"><div class="m_75cd9f71 mantine-List-itemWrapper"><span class="m_60f83e5b mantine-List-itemIcon"><div class="m_4451eb3a mantine-Center-root"><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;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-chevron-compact-right "><path d="M11 4l3 8l-3 8"></path></svg></div></div></span><span class="mantine-List-itemLabel"><a style="color:inherit" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/blog/posts/novichki-ne-platite-za-kursy">Новички, не платите за курсы</a></span></div></li><li style="margin-bottom:var(--mantine-spacing-sm)" class="m_abb6bec2 mantine-List-item" data-with-icon="true"><div class="m_75cd9f71 mantine-List-itemWrapper"><span class="m_60f83e5b mantine-List-itemIcon"><div class="m_4451eb3a mantine-Center-root"><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;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-chevron-compact-right "><path d="M11 4l3 8l-3 8"></path></svg></div></div></span><span class="mantine-List-itemLabel"><a style="color:inherit" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/blog/posts/frontend-nachalo-puti">Frontend. 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