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data-v-cb0dd5fc></iframe><div class="heroSpace-title" data-v-cb0dd5fc><header data-v-cb0dd5fc><p data-v-cb0dd5fc></p><h1 itemprop="name" data-v-cb0dd5fc></h1></header></div></div></div><div data-v-da421125><div class="eyecatch" data-v-da421125 style="--0e97d286:eyecatch-210224;" data-v-921b35f7><div class="eyecatch-blur-container" data-v-921b35f7><img class="eyecatch-blur" fetchpriority="high" src="/entry/210224/images/eyecatch.png" width="1280" height="512" alt="" data-v-921b35f7></div><div class="eyecatch-inner" data-v-921b35f7><img src="/entry/210224/images/eyecatch.png" alt="" width="1280" height="512" class="eyecatch-inner-img" fetchpriority="high" data-v-921b35f7></div></div><main class="wrap_960" data-v-da421125 data-v-49d92408><article data-v-49d92408><h2 class="article_title" data-v-49d92408 data-v-3469d367><span class="wbr">Reactの</span><span class="wbr">状態管理ライブラリ</span><span class="wbr">「Recoil」とは？</span><span class="wbr"> Reduxとの</span><span class="wbr">違いを</span><span class="wbr">解説</span></h2><div class="article-date" data-v-49d92408><meta itemProp="datePublished" content="2021-02-24" data-v-d384dd23><span class="article-date-item" data-v-d384dd23><time itemProp="dateModified" dateTime="2025-01-10" title="2021年2月24日に公開" data-v-d384dd23>1月10日</time> メンテナンス済み</span><span class="article-date-item article-date-slash" data-v-49d92408> / </span><a href="/entry/staff/ics/" class="article-date-item" data-v-49d92408>株式会社ICS</a></div><ul class="article-tag" data-v-49d92408><li data-v-49d92408><a href="/entry/tag/React/" class="" data-v-49d92408>React</a></li></ul><div class="sns-share" data-v-49d92408 data-v-694562d6><div data-v-694562d6><a href="https://twitter.com/intent/tweet?url=https://ics.media/entry/210224/&text=Reactの状態管理ライブラリ「Recoil」とは？ Reduxとの違いを解説 - ICS MEDIA" class="sns-share-btn _x" target="_blank" title="X（旧Twitter）でシェア" data-v-694562d6></a><span class="sns-share-badge" data-v-694562d6>118</span></div><div data-v-694562d6><a class="sns-share-btn _hatena" href="https://b.hatena.ne.jp/entry/s/ics.media/entry/210224/" target="_blank" title="はてなブックマークでブックマーク" data-v-694562d6></a><span class="sns-share-badge" data-v-694562d6>131</span></div></div><div class="entry" data-v-49d92408><div class="entry-article article" data-v-49d92408><section data-v-49d92408><p><a href="https://ja.reactjs.org/" target="_blank">React</a>の開発において、状態管理の方法は注意深く検討する必要があります。状態管理ライブラリ「<a href="https://redux.js.org/" target="_blank">Redux</a>」が大きい勢力ではありますが（参照：<a href="https://npmtrends.com/jotai-vs-mobx-vs-recoil-vs-redux" target="_blank">npm trends</a>）、記事『<a href="https://ics.media/entry/200409/">ベストな手法は？ Reactのステート管理方法まとめ</a>』でも紹介した通りさまざまな状態管理の手法が現在でも編み出されています。本記事では状態管理ライブラリ「<a href="https://recoiljs.org/" target="_blank">Recoil</a>」についての概要と簡単な使い方、Reduxとの思想の違いについて解説します。</p> <p>注意：Recoilは2025年1月にプロジェクトがアーカイブされました（参照：『<a href="https://zenn.dev/mk668a/articles/88685dfa915474" target="_blank">Recoil 終了のお知らせ</a>』）。本記事は2025年1月時点のRecoil 0.7.7で動作するように更新していますが、今後のメンテナンスはされない可能性があります。</p> <h3 id="redux%E3%81%AB%E3%82%88%E3%82%8B%E7%8A%B6%E6%85%8B%E7%AE%A1%E7%90%86%E3%81%AE%E6%87%B8%E5%BF%B5%E7%82%B9" tabindex="-1">Reduxによる状態管理の懸念点</h3> <p>Reduxでは状態管理を一か所にまとめられるというメリットがあります。これはメリットのように思えますが、小さな単位の状態管理もReduxに委ねるのか迷いどころです。</p> <p>また、Reduxは状態更新の作法的な書き方が複雑でした。<a href="https://redux-toolkit.js.org/" target="_blank">Redux Toolkit</a>というReduxのアドオンとしてのJSライブラリもありますが、基本的には作法的な書き方はあまり軽減しません。</p> <p><img srcset="/entry/210224/images/20210224_recoil_redux.png 1920w, /entry/210224/images/20210224_recoil_redux__960.png 960w" src="/entry/210224/images/20210224_recoil_redux.png" sizes="(max-width:720px) 100vw, 720px" width="1920" height="1080" alt="Reduxの懸念点" loading="lazy"></img></p> <h3 id="recoil%E3%81%A8%E3%81%AF%EF%BC%9F" tabindex="-1">Recoilとは？</h3> <p>Recoilは、Meta（当時はFacebook）によって提唱された状態管理ライブラリです。「<strong>Atom</strong>」「<strong>Selector</strong>」と呼ばれる単位を使用してアプリケーションデータを管理します。Hooks APIで使うことを前提に作られています。</p> <ul> <li>Atomとは：データの保存場所。</li> <li>Selectorとは：Atomをもとにデータの派生状態を取得する関数。</li> </ul> <p><img srcset="/entry/210224/images/20210224_recoil_top.png 1920w, /entry/210224/images/20210224_recoil_top__960.png 960w" src="/entry/210224/images/20210224_recoil_top.png" sizes="(max-width:720px) 100vw, 720px" width="1920" height="941" alt="Recoilトップページ" loading="lazy"></img></p> <h3 id="recoil%E3%81%AE%E4%BD%BF%E7%94%A8%E6%96%B9%E6%B3%95" tabindex="-1">Recoilの使用方法</h3> <p>Recoilを利用するには、npmもしくはyarnで<code>recoil</code>をプロジェクトに導入します。</p> <pre><code class="hljs language-bash">npm install recoil </code></pre> <p>※TypeScriptの型定義ファイルも<a href="https://www.npmjs.com/package/recoil" target="_blank">recoilモジュール</a>に同梱されています。</p> <h3 id="recoil%E3%81%A7%E3%83%A1%E3%83%A2%E5%B8%B3%E3%82%A2%E3%83%97%E3%83%AA%E3%82%B1%E3%83%BC%E3%82%B7%E3%83%A7%E3%83%B3%E3%82%92%E4%BD%9C%E3%81%A3%E3%81%A6%E3%81%BF%E3%82%8B" tabindex="-1">Recoilでメモ帳アプリケーションを作ってみる</h3> <p>サンプルとして、Recoil＋TypeScriptでメモ帳のアプリケーションを作成しました。</p> <iframe loading="lazy" width="960" height="540" sandbox="allow-scripts" src="https://ics-creative.github.io/210224_recoil_notepad_demo"></iframe> <ul> <li><a href="https://ics-creative.github.io/210224_recoil_notepad_demo" target="_blank">サンプルを別ウインドウで開く</a></li> <li><a href="https://github.com/ics-creative/210224_recoil_notepad_demo" target="_blank">コードを確認する</a></li> </ul> <p>公式の<a href="https://recoiljs.org/docs/basic-tutorial/intro" target="_blank">Todoリストのチュートリアル</a>をTypeScriptとして改良したものとなっています。</p> <p>以下の説明は、上記のデモを抜粋して解説し8ます。</p> <h4 id="recoilroot%E3%81%AE%E4%BD%9C%E6%88%90" tabindex="-1">RecoilRootの作成</h4> <p>Recoilによる状態管理をアプリケーションで使用するには、RecoilRootというコンポーネントで囲む必要があります。</p> <p>▼App.tsx</p> <pre><code class="hljs language-jsx"><span class="hljs-keyword">import</span> <span class="hljs-title class_">React</span> <span class="hljs-keyword">from</span> <span class="hljs-string">"react"</span>; <span class="hljs-keyword">import</span> { <span class="hljs-title class_">RecoilRoot</span> } <span class="hljs-keyword">from</span> <span class="hljs-string">"recoil"</span>; <span class="hljs-keyword">import</span> { <span class="hljs-title class_">NoteApp</span> } <span class="hljs-keyword">from</span> <span class="hljs-string">"./components/NoteApp"</span>; <span class="hljs-keyword">export</span> <span class="hljs-keyword">const</span> <span class="hljs-title function_">App</span> = (<span class="hljs-params"></span>) => { <span class="hljs-keyword">return</span> ( <span class="language-xml"><span class="hljs-tag"><<span class="hljs-name">div</span> <span class="hljs-attr">className</span>=<span class="hljs-string">"App"</span>></span> <span class="hljs-tag"><<span class="hljs-name">h1</span>></span>NotePad App<span class="hljs-tag"></<span class="hljs-name">h1</span>></span> {/* Recoilのコンポーネントで囲う */} <span class="hljs-tag"><<span class="hljs-name">RecoilRoot</span>></span> <span class="hljs-tag"><<span class="hljs-name">NoteApp</span> /></span> <span class="hljs-tag"></<span class="hljs-name">RecoilRoot</span>></span> <span class="hljs-tag"></<span class="hljs-name">div</span>></span></span> ); }; </code></pre> <p>※<code><NoteApp /></code>は任意のコンポーネントです。詳しくはサンプルのコードを確認ください。</p> <p>このコンポーネントは、ReactのContext APIのようにルート直下のコンポーネントの状態管理を担当します。</p> <h4 id="atoms%E3%81%AE%E4%BD%9C%E6%88%90" tabindex="-1">Atomsの作成</h4> <p>Atomsは、Reduxでいうところのストアに相当します。明確な違いとしては、Reduxはアプリケーション単位での状態管理であるのに対し、Atomsは一つひとつが状態を保持しているという点です。</p> <p>▼notesAtom.ts</p> <pre><code class="hljs language-ts"><span class="hljs-keyword">import</span> { atom } <span class="hljs-keyword">from</span> <span class="hljs-string">"recoil"</span>; <span class="hljs-comment">/** * ノートのデータ管理場所です。 */</span> <span class="hljs-keyword">export</span> <span class="hljs-keyword">const</span> notesAtom = <span class="hljs-title function_">atom</span>({ <span class="hljs-attr">key</span>: <span class="hljs-string">"Notepad"</span>, <span class="hljs-comment">// 任意のユニークな名前</span> <span class="hljs-comment">// 初期値</span> <span class="hljs-attr">default</span>: [ { <span class="hljs-attr">id</span>: <span class="hljs-string">"1"</span>, <span class="hljs-attr">value</span>: <span class="hljs-string">""</span>, <span class="hljs-attr">isComplete</span>: <span class="hljs-literal">false</span>, }, { <span class="hljs-attr">id</span>: <span class="hljs-string">"2"</span>, <span class="hljs-attr">value</span>: <span class="hljs-string">""</span>, <span class="hljs-attr">isComplete</span>: <span class="hljs-literal">false</span>, }, ], }); </code></pre> <p>▼NoteApp.tsx</p> <pre><code class="hljs language-tsx"><span class="hljs-keyword">import</span> <span class="hljs-title class_">React</span>, { useCallback } <span class="hljs-keyword">from</span> <span class="hljs-string">"react"</span>; <span class="hljs-keyword">import</span> { useRecoilState, useSetRecoilState } <span class="hljs-keyword">from</span> <span class="hljs-string">"recoil"</span>; <span class="hljs-keyword">import</span> { notesAtom } <span class="hljs-keyword">from</span> <span class="hljs-string">"../atoms/notesAtom"</span>; <span class="hljs-keyword">import</span> { <span class="hljs-title class_">NoteStats</span> } <span class="hljs-keyword">from</span> <span class="hljs-string">"./NoteStats"</span>; <span class="hljs-keyword">import</span> { <span class="hljs-title class_">NoteItem</span> } <span class="hljs-keyword">from</span> <span class="hljs-string">"./NoteItem"</span>; <span class="hljs-comment">/** * メモ帳のアプリケーションです。 */</span> <span class="hljs-keyword">export</span> <span class="hljs-keyword">const</span> <span class="hljs-title class_">NoteApp</span>: <span class="hljs-title class_">React</span>.<span class="hljs-property">FC</span> = <span class="hljs-function">() =></span> { <span class="hljs-comment">// Recoilの Atoms を呼び出して定義</span> <span class="hljs-keyword">const</span> setNotepad = <span class="hljs-title function_">useSetRecoilState</span>(notesAtom); <span class="hljs-comment">// ステートとして利用する</span> <span class="hljs-keyword">const</span> [notes] = <span class="hljs-title function_">useRecoilState</span>(notesAtom); <span class="hljs-comment">/** * メモ帳を新しく作成するコールバックです。 */</span> <span class="hljs-keyword">const</span> handleCreate = <span class="hljs-title function_">useCallback</span>(<span class="hljs-function">() =></span> { <span class="hljs-title function_">setNotepad</span>(<span class="hljs-function">(<span class="hljs-params">state</span>) =></span> [ ...state, { <span class="hljs-attr">id</span>: <span class="hljs-title class_">String</span>(state.<span class="hljs-property">length</span> + <span class="hljs-number">1</span>), <span class="hljs-attr">value</span>: <span class="hljs-string">""</span>, <span class="hljs-attr">isComplete</span>: <span class="hljs-literal">false</span> }, ].<span class="hljs-title function_">sort</span>(<span class="hljs-function">(<span class="hljs-params">a, b</span>) =></span> a.<span class="hljs-property">id</span>.<span class="hljs-title function_">localeCompare</span>(b.<span class="hljs-property">id</span>)) ); }, [setNotepad]); <span class="hljs-keyword">return</span> ( <span class="language-xml"><span class="hljs-tag"><<span class="hljs-name">div</span>></span> <span class="hljs-tag"><<span class="hljs-name">NoteStats</span> /></span> <span class="hljs-tag"><<span class="hljs-name">div</span> <span class="hljs-attr">className</span>=<span class="hljs-string">"noteList"</span>></span> {notes.map((note) => ( <span class="hljs-tag"><<span class="hljs-name">NoteItem</span> <span class="hljs-attr">key</span>=<span class="hljs-string">{note.id}</span> <span class="hljs-attr">item</span>=<span class="hljs-string">{note}</span> /></span> ))} <span class="hljs-tag"></<span class="hljs-name">div</span>></span> <span class="hljs-tag"><<span class="hljs-name">div</span> <span class="hljs-attr">className</span>=<span class="hljs-string">"button_area"</span>></span> <span class="hljs-tag"><<span class="hljs-name">button</span> <span class="hljs-attr">onClick</span>=<span class="hljs-string">{handleCreate}</span>></span>追加<span class="hljs-tag"></<span class="hljs-name">button</span>></span> <span class="hljs-tag"></<span class="hljs-name">div</span>></span> <span class="hljs-tag"></<span class="hljs-name">div</span>></span></span> ); }; </code></pre> <p>Atomsは一意のキーを持っており、Hooks APIの<code>useRecoilState()</code>で状態を共有できます。</p> <h4 id="selectors%E3%81%AE%E4%BD%9C%E6%88%90" tabindex="-1">Selectorsの作成</h4> <p>セレクターはAtomからデータを加工する関数として定義します。<code>get()</code>メソッドにAtomのデータをもとに加工計算を行っています。</p> <p>以下の例では、Todoリスト的な完了状態の数値を計算して、「完了した数」「未完了の数」「割合」等を計算しています。</p> <p>▼notesSelector.ts</p> <pre><code class="hljs language-tsx"><span class="hljs-keyword">import</span> { selector } <span class="hljs-keyword">from</span> <span class="hljs-string">"recoil"</span>; <span class="hljs-keyword">import</span> { notesAtom } <span class="hljs-keyword">from</span> <span class="hljs-string">"./notesAtom"</span>; <span class="hljs-comment">/** * このセレクターは、メモ帳リストの統計を計算するために使用されます。 */</span> <span class="hljs-keyword">export</span> <span class="hljs-keyword">const</span> notesSelector = <span class="hljs-title function_">selector</span>({ <span class="hljs-attr">key</span>: <span class="hljs-string">"notepadStats"</span>, <span class="hljs-attr">get</span>: <span class="hljs-function">(<span class="hljs-params">{ get }</span>) =></span> { <span class="hljs-keyword">const</span> notepadList = <span class="hljs-title function_">get</span>(notesAtom); <span class="hljs-keyword">const</span> totalNum = notepadList.<span class="hljs-property">length</span>; <span class="hljs-keyword">const</span> totalCompletedNum = notepadList.<span class="hljs-title function_">filter</span>( <span class="hljs-function">(<span class="hljs-params">item</span>) =></span> item.<span class="hljs-property">isComplete</span> ).<span class="hljs-property">length</span>; <span class="hljs-keyword">const</span> totalUncompletedNum = totalNum - totalCompletedNum; <span class="hljs-keyword">const</span> percentCompleted = totalNum === <span class="hljs-number">0</span> ? <span class="hljs-number">0</span> : (totalCompletedNum / totalNum) * <span class="hljs-number">100</span>; <span class="hljs-keyword">return</span> { totalNum, totalCompletedNum, totalUncompletedNum, percentCompleted, }; }, }); </code></pre> <p>コンポーネント側では<code>useRecoilValue()</code>メソッドを使って、セレクターからの値を連動しています。</p> <p>▼NoteStats.tsx</p> <pre><code class="hljs language-tsx"><span class="hljs-keyword">import</span> { useRecoilValue } <span class="hljs-keyword">from</span> <span class="hljs-string">"recoil"</span>; <span class="hljs-keyword">import</span> { notesSelector } <span class="hljs-keyword">from</span> <span class="hljs-string">"../atoms/notesSelector"</span>; <span class="hljs-keyword">import</span> <span class="hljs-title class_">React</span> <span class="hljs-keyword">from</span> <span class="hljs-string">"react"</span>; <span class="hljs-comment">/** * メモ帳の統計情報を表示するコンポーネントです。 */</span> <span class="hljs-keyword">export</span> <span class="hljs-keyword">const</span> <span class="hljs-title class_">NoteStats</span>: <span class="hljs-title class_">React</span>.<span class="hljs-property">FC</span> = <span class="hljs-function">() =></span> { <span class="hljs-keyword">const</span> { totalNum, totalCompletedNum, totalUncompletedNum, percentCompleted } = <span class="hljs-title function_">useRecoilValue</span>(notesSelector); <span class="hljs-keyword">const</span> formattedPercentCompleted = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">round</span>(percentCompleted); <span class="hljs-keyword">return</span> ( <span class="language-xml"><span class="hljs-tag"><<span class="hljs-name">ul</span>></span> <span class="hljs-tag"><<span class="hljs-name">li</span>></span>すべての個数: {totalNum}<span class="hljs-tag"></<span class="hljs-name">li</span>></span> <span class="hljs-tag"><<span class="hljs-name">li</span>></span>完了したアイテム: {totalCompletedNum}<span class="hljs-tag"></<span class="hljs-name">li</span>></span> <span class="hljs-tag"><<span class="hljs-name">li</span>></span>未完了のアイテム: {totalUncompletedNum}<span class="hljs-tag"></<span class="hljs-name">li</span>></span> <span class="hljs-tag"><<span class="hljs-name">li</span>></span>完了した割合: {formattedPercentCompleted}%<span class="hljs-tag"></<span class="hljs-name">li</span>></span> <span class="hljs-tag"></<span class="hljs-name">ul</span>></span></span> ); }; </code></pre> <h4 id="recoil%E3%81%A7%E9%9D%9E%E5%90%8C%E6%9C%9F%E3%82%A2%E3%82%AF%E3%82%B7%E3%83%A7%E3%83%B3%E3%82%92%E5%8F%96%E3%82%8A%E6%89%B1%E3%81%86" tabindex="-1">Recoilで非同期アクションを取り扱う</h4> <p>Reduxなどで非同期の状態変更アクションを呼び出す際には、Redux-thunkやRedux-sagaなどといった別のミドルウェアを通して管理する必要があります。</p> <p>Recoilには非同期通信用のAPIが提供されているため、Reactのバージョン16.6から提供されたPromiseをキャッチできる<code>Suspense</code>コンポーネントを使って実現できます。これにより、スマートな実装が可能です。</p> <p><code>Suspense</code>コンポーネントについては、『<a href="https://ics.media/entry/200310/">React今昔物語</a>』で詳しく解説していますのでこちらも合わせてお読みください。</p> <pre><code class="hljs language-jsx"><span class="hljs-comment">// ユーザーIDをDBから非同期で取得する Selector 関数</span> <span class="hljs-keyword">const</span> currentUserNameQuery = <span class="hljs-title function_">selector</span>({ <span class="hljs-attr">key</span>: <span class="hljs-string">"CurrentUserName"</span>, <span class="hljs-attr">get</span>: <span class="hljs-title function_">async</span> ({ get }) => {no <span class="hljs-comment">// 架空の非同期取得の処理です。 </span> <span class="hljs-keyword">const</span> response = <span class="hljs-keyword">await</span> <span class="hljs-title function_">myDBQuery</span>({ <span class="hljs-attr">userID</span>: <span class="hljs-title function_">get</span>(currentUserIDState), }); <span class="hljs-keyword">return</span> response.<span class="hljs-property">name</span>; }, }); <span class="hljs-keyword">const</span> <span class="hljs-title function_">CurrentUserInfo</span> = (<span class="hljs-params"></span>) => { <span class="hljs-keyword">const</span> userName = <span class="hljs-title function_">useRecoilValue</span>(currentUserNameQuery); <span class="hljs-keyword">return</span> <span class="language-xml"><span class="hljs-tag"><<span class="hljs-name">div</span>></span>{userName}<span class="hljs-tag"></<span class="hljs-name">div</span>></span></span>; }; <span class="hljs-comment">// Suspenseを使って、</span> <span class="hljs-comment">// Promiseが返却されるまでフォールバックを表示する</span> <span class="hljs-keyword">export</span> <span class="hljs-keyword">const</span> <span class="hljs-title function_">User</span> = (<span class="hljs-params"></span>) => { <span class="language-xml"><span class="hljs-tag"><<span class="hljs-name">RecoilRoot</span>></span> <span class="hljs-tag"><<span class="hljs-name">Suspense</span> <span class="hljs-attr">fallback</span>=<span class="hljs-string">"読み込み中"</span>></span> <span class="hljs-tag"><<span class="hljs-name">CurrentUserInfo</span> /></span> <span class="hljs-tag"></<span class="hljs-name">Suspense</span>></span> <span class="hljs-tag"></<span class="hljs-name">RecoilRoot</span>></span></span>; }; </code></pre> <h3 id="%E3%81%BE%E3%81%A8%E3%82%81" tabindex="-1">まとめ</h3> <p>Reactの状態管理はさまざまな手法が存在しており、設計時に頭を悩ませる要因のひとつです。Reduxは定番の状態管理ライブラリとして根強い人気がありますが、スコープがグローバルになってしまうことが難点です。</p> <p>Recoilは2025年1月にアーカイブ化となりましたが、Recoilの類似のライブラリとしては「<a href="https://jotai.org/" target="_blank">Jotai</a>」があります。JotaiはICSでも積極的に利用しています。あわせて検討するといいでしょう。</p> </section><p data-v-49d92408> ※この記事が公開されたのは<strong>4年前</strong>ですが、<strong>2か月前の1月</strong>に内容をメンテナンスしています。 </p></div><div class="entry-sidebar" data-v-49d92408><div class="sidebar" data-v-49d92408><ol class="sidebarList"><li class="sidebarList_item"><a href="#top">冒頭</a></li><li data-index="0" class="sidebarList_item"><a href="#redux%E3%81%AB%E3%82%88%E3%82%8B%E7%8A%B6%E6%85%8B%E7%AE%A1%E7%90%86%E3%81%AE%E6%87%B8%E5%BF%B5%E7%82%B9">Reduxによる状態管理の懸念点</a></li><li data-index="1" class="sidebarList_item"><a href="#recoil%E3%81%A8%E3%81%AF%EF%BC%9F">Recoilとは？</a></li><li data-index="2" class="sidebarList_item"><a href="#recoil%E3%81%AE%E4%BD%BF%E7%94%A8%E6%96%B9%E6%B3%95">Recoilの使用方法</a></li><li data-index="3" class="sidebarList_item"><a href="#recoil%E3%81%A7%E3%83%A1%E3%83%A2%E5%B8%B3%E3%82%A2%E3%83%97%E3%83%AA%E3%82%B1%E3%83%BC%E3%82%B7%E3%83%A7%E3%83%B3%E3%82%92%E4%BD%9C%E3%81%A3%E3%81%A6%E3%81%BF%E3%82%8B">Recoilでメモ帳アプリケーションを作ってみる</a></li><li data-index="4" class="sidebarList_item sidebarList_item__sub"><a href="#recoilroot%E3%81%AE%E4%BD%9C%E6%88%90">RecoilRootの作成</a></li><li data-index="5" class="sidebarList_item sidebarList_item__sub"><a href="#atoms%E3%81%AE%E4%BD%9C%E6%88%90">Atomsの作成</a></li><li data-index="6" class="sidebarList_item sidebarList_item__sub"><a href="#selectors%E3%81%AE%E4%BD%9C%E6%88%90">Selectorsの作成</a></li><li data-index="7" class="sidebarList_item sidebarList_item__sub"><a href="#recoil%E3%81%A7%E9%9D%9E%E5%90%8C%E6%9C%9F%E3%82%A2%E3%82%AF%E3%82%B7%E3%83%A7%E3%83%B3%E3%82%92%E5%8F%96%E3%82%8A%E6%89%B1%E3%81%86">Recoilで非同期アクションを取り扱う</a></li><li data-index="8" class="sidebarList_item"><a href="#%E3%81%BE%E3%81%A8%E3%82%81">まとめ</a></li></ol></div></div></div></article></main><div class="wrap_960" data-v-da421125><div class="SnsButtons" data-v-da421125 data-v-b5cbd36c><p class="SnsButtons-head" data-v-b5cbd36c>\ SNSでシェアしよう /</p><div class="SnsButtons-sns" data-v-b5cbd36c><a href="https://twitter.com/intent/tweet?url=https://ics.media/entry/210224/&text=React%E3%81%AE%E7%8A%B6%E6%85%8B%E7%AE%A1%E7%90%86%E3%83%A9%E3%82%A4%E3%83%96%E3%83%A9%E3%83%AA%E3%80%8CRecoil%E3%80%8D%E3%81%A8%E3%81%AF%EF%BC%9F%20Redux%E3%81%A8%E3%81%AE%E9%81%95%E3%81%84%E3%82%92%E8%A7%A3%E8%AA%AC%20-%20ICS%20MEDIA" target="_blank" class="btn btn-secondary btn-sm share-x" data-v-b5cbd36c><span data-v-b5cbd36c>X（旧Twitter）でポストする</span></a><a href="https://b.hatena.ne.jp/entry/s/ics.media/entry/210224/" target="_blank" class="btn btn-secondary btn-sm share-facebook" data-v-b5cbd36c><span data-v-b5cbd36c>はてなブックマーク</span></a></div></div><div class="author-info" data-v-da421125 style="--475ed944:staff-ics;" data-v-9742c4dd><div class="author-avatar" data-v-9742c4dd><img src="/_assets/top/staff/ics-staff.png" width="64" height="64" alt="" loading="lazy" data-v-9742c4dd></div><div class="author-desc" data-v-9742c4dd><div class="author-desc-name" data-v-9742c4dd><div data-v-9742c4dd>編集部</div><div data-v-9742c4dd><a class="btn btn-secondary btn-x" target="_blank" href="https://twitter.com/icsweb" data-v-9742c4dd><svg width="16" height="16" viewbox="0 0 240 240" fill="none" xmlns="http://www.w3.org/2000/svg" data-v-9742c4dd><path d="M240 0H0V240H240V0Z" fill="black"></path><path d="M88.2 60.6602L169.46 178.81H151.42L70.16 60.6602H88.2ZM92.93 51.6602H53.04L146.68 187.81H186.57L92.93 51.6602Z" fill="white"></path><path d="M132.54 109.25L182.24 51.6602H170.99L127.55 101.99L132.54 109.25Z" fill="white"></path><path d="M105.36 127.72L53.04 188.34H64.3L110.35 134.98L105.36 127.72Z" fill="white"></path></svg>フォロー </a></div></div><p class="author-desc-script" data-v-9742c4dd>ICS MEDIAは株式会社ICSが運営するオウンドメディアです。ICSはインタラクションデザイン専門のプロダクション。最先端のウェブテクノロジーを駆使し、オンスクリーンメディアの表現分野で活動しています。</p><a href="/entry/staff/ics/" class="btn btn-secondary" data-v-9742c4dd> この担当の記事一覧 </a></div></div></div><aside class="wrap_960 banners" data-v-da421125 data-v-84d78e6a><ul 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