{"id":13760,"date":"2021-07-22T20:03:10","date_gmt":"2021-07-22T11:03:10","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=13760"},"modified":"2023-05-27T22:19:11","modified_gmt":"2023-05-27T13:19:11","slug":"%e3%80%90redux%e3%80%91","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=13760","title":{"rendered":"\u3010Redux\u3011\u65b0\u3057\u3044Store\u3068\u306e\u63a5\u7d9a\u65b9\u6cd5"},"content":{"rendered":"<p>2019\u5e74\u306bReact Hooks\u304c\u767b\u5834\u3057\u3066\u3001Redux\u3082v7.1.0\u306b\u306a\u308aReact Hooks\u306b\u5bfe\u5fdc\u3057\u305fRedux\u306eStore\u306b\u63a5\u7d9a\u3059\u308b\u65b9\u6cd5\u304c\u5897\u3048\u307e\u3057\u305f\u3002<\/p>\n<h2>\u5f93\u6765\u306e\u66f8\u304d\u65b9<\/h2>\n<p>connect\u95a2\u6570\u3092\u4f7f\u3046\u3002<\/p>\n<h2>\u65b0\u3057\u3044\u66f8\u304d\u65b9<\/h2>\n<p>useSelector\u3068useDispatch\u3092\u4f7f\u3046\u65b9\u6cd5\u3001\u306a\u304a\u3001\u3053\u306e\u65b9\u6cd5\u306f\u540c\u3058\u304f2019\u5e74\u306b\u767b\u5834\u3057\u305f<span style=\"color: #ff0000;\"><strong>\u300cRedux Tool Kit\u300d<\/strong><\/span>\u3092\u4f7f\u3046\u5834\u5408\u3067\u3082\u4e00\u822c\u7684\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>useSelector<\/h3>\n<ul>\n<li>store\u306estate\u3092presentational component\u3078\u6301\u3063\u3066\u304f\u308b\u3053\u3068\u304c\u3067\u304d\u308b<\/li>\n<li>connect\u3057\u3066\u306a\u3044\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u3082Store\u3092\u53c2\u7167\u3067\u304d\u308b\u3002<\/li>\n<li>connect\u3057\u306a\u304f\u3066\u3082Store\u3092\u53c2\u7167\u3067\u304d\u308b\u306e\u3067Container\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u4e0d\u8981\u306b\u306a\u3063\u305f\u3002<\/li>\n<li>action\u304cdispatch\u3055\u308c\u308b\u3068\u5b9f\u884c\u3055\u308c\u308b\u3002<\/li>\n<li>state\u306e\u5024\u304c\u524d\u56de\u3068\u540c\u3058\u3067\u3042\u308c\u3070\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u305f\u8a08\u7b97\u7d50\u679c\u3092\u8fd4\u3057\u3066\u304f\u308c\u308b\u3002<\/li>\n<\/ul>\n<h3>\u6ce8\u610f\u70b9<\/h3>\n<p>\u4ee5\u4e0b\u3092\u610f\u8b58\u3057\u306a\u3044\u3068connect\u3088\u308a\u3082\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u4f4e\u4e0b\u3057\u307e\u3059\u3002<\/p>\n<h4>1.useSelector\u3084\u914d\u5217\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3059\u969b\u306fshallowEqual\u3068\u4f75\u7528\u3059\u308b\u3002<\/h4>\n<p>connect\u3060\u3068\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e2d\u8eab\u307e\u3067\u6bd4\u8f03\u3057\u3066\u304f\u308c\u3066\u3044\u305f\u304c\u3001useSelector\u306e\u5834\u5408\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u540c\u58eb\u3092\u300c===\u300d\u3067\u6bd4\u8f03\u3057\u3066\u3057\u307e\u3046\u306e\u3067\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u305f\u5024\u304c\u7528\u3044\u3089\u308c\u306a\u3044\u3002<\/p>\n<p>\u5177\u4f53\u7684\u306b\u306f\u7b2c\u4e8c\u5f15\u6570\u306b<span style=\"color: #ff0000;\"><strong>shallowEqual<\/strong><\/span>\u3092\u4f7f\u3046\u3068\u5f93\u6765\u307e\u3067\u306e\u6bd4\u8f03\u3068\u540c\u3058\u3088\u3046\u306b\u3084\u3063\u3066\u304f\u308c\u308b\u306e\u3067\u697d\u3067\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true\">import { useSelector, shallowEqual } from 'react-redux'\r\nconst result = useSelector(state =&gt; state.hoge, shallowEqual)<\/pre>\n<p>\u306a\u304a\u3001<span style=\"color: #ff0000;\"><strong>shallowEqual\u3092\u4f7f\u308f\u306a\u304f\u3066\u3082<\/strong><strong>\u5f8c\u8ff0\u3059\u308b<\/strong><strong>\u300creselect\u300d<\/strong><\/span>\u3092\u4f7f\u3046\u3053\u3068\u3067\u3082\u3053\u306e\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u5bfe\u7b56\u306f\u3067\u304d\u308b\u307f\u305f\u3044\u3067\u3059\u3002\uff08\u30e1\u30e2\u5316\u3055\u308c\u305f\u5024\u3092\u4f7f\u3046\u305f\u3081\u3002\uff09<\/p>\n<h4>2.\u91cd\u3044\u51e6\u7406\u306b\u306freselect\u3092\u4f7f\u3046\u3002<\/h4>\n<p>\u3053\u3053\u307e\u3067\u306f\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u304c\u767a\u751f\u3057\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u306e\u5bfe\u7b56\u3067\u3057\u305f\u3002<\/p>\n<p>\u6b21\u306f\u3001selector\u305d\u306e\u3082\u306e\u306e\u8a08\u7b97\u91cf\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3067\u3059\u306d\u3002<\/p>\n<p>\u57fa\u672c\u7684\u306buseSelector\u306fselector\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u5909\u308f\u3089\u306a\u3044\u9650\u308a\u306f\u518d\u8a08\u7b97\u306f\u884c\u308f\u306a\u3044\u3067\u3059\u3002\u305f\u3060\u3001<span style=\"color: #ff0000;\"><strong>store\u306e\u95a2\u4fc2\u306a\u3044slice\u306e\u95a2\u6570\u51e6\u7406\u3092\u547c\u3093\u3060\u5834\u5408\u3067\u3082\u3001\u518d\u8a08\u7b97\u306f\u547c\u3070\u308c\u307e\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u3053\u308c\u306f<\/strong><strong>selector\u95a2\u6570\u304c\u65b0\u3057\u3044\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3068\u306a\u308b\u305f\u3081\u306b\u518d\u8a08\u7b97\u304c\u884c\u308f\u308c\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/strong><\/span>\u305d\u306e\u3088\u3046\u306a\u51e6\u7406\u3092\u6271\u3046\u5834\u5408\u306freselect\u3092\u4f7f\u3063\u3066\u30e1\u30e2\u5316\u3057\u3066\u518d\u8a08\u7b97\u304c\u884c\u308f\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>useDispatch<\/h3>\n<ul>\n<li>action\u3092dispatch\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b<\/li>\n<li>connect\u3057\u306a\u304f\u3066\u3082Action\u3092\u547c\u3073\u51fa\u305b\u308b\u306e\u3067\u3001Container\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u4e0d\u8981\u306b\u306a\u3063\u305f\u3002<\/li>\n<li>store\u3092\u5909\u66f4\u3057\u306a\u3044\u9650\u308a\u3001\u8fd4\u308a\u5024\u306edispatch\u95a2\u6570\u306f\u5909\u66f4\u3055\u308c\u306a\u3044<\/li>\n<\/ul>\n<h2>connect\u3068useSelector\u306e\u9055\u3044<\/h2>\n<h3>connect<\/h3>\n<p>HOC\u3067\u3059\u3002\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u6e21\u3059\u3068\u4ee5\u4e0b\u306e\u4f5c\u696d\u3092\u3059\u3079\u3066\u884c\u3046\u30e9\u30c3\u30d1\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>store\u3078\u306e\u30b5\u30d6\u30b9\u30af\u30e9\u30a4\u30d6<\/li>\n<li>mapState\u3068mapDispatch\u306e\u5b9f\u884c<\/li>\n<li>\u7d50\u5408\u3055\u308c\u305fprops\u3092\u305d\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u6e21\u3059\u3002<\/li>\n<\/ul>\n<p>\u5e38\u306b\u3001PureComponent\u3084React.memo\u3068\u540c\u3058\u3088\u3046\u306b\u52d5\u4f5c\u3057\u307e\u3059\u304c\u3001connect\u306f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u6e21\u3059\u6700\u7d42\u7684\u306b\u7d50\u5408\u3055\u308c\u305fprops\u304c\u5909\u66f4\u3055\u308c\u305f\u5834\u5408\u306e\u307f\u306b\u81ea\u5206\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3059\u308b\u3002<\/p>\n<p>\u306a\u306e\u3067\u3001connect\u3092\u4f7f\u3063\u3066\u3044\u308b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u5f71\u97ff\u3092\u304b\u306a\u308a\u5c0f\u3055\u3044\u90e8\u5206\u306b\u6b62\u3081\u308b\u3053\u3068\u304c\u53ef\u80fd\u3002<\/p>\n<h3>useSelector<\/h3>\n<p>\u95a2\u6570\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u5185\u90e8\u3067\u547c\u3073\u51fa\u3055\u308c\u308b\u30d5\u30c3\u30af\u3002\u306a\u306e\u3067\u3001\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u3055\u308c\u308b\u969b\u306b\u3001useSelector\u306f\u5b50\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u6b62\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u3002<\/p>\n<p>\u306a\u306e\u3067\u3001\u91cd\u3044\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u5834\u5408\u306f\u3001React.memo\u3068\u4f75\u7528\u3059\u308b\u3053\u3068\u304c\u5fc5\u8981\u306b\u306a\u308b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"2019\u5e74\u306bReact Hooks\u304c\u767b\u5834\u3057\u3066\u3001Redux\u3082v7.1.0\u306b\u306a\u308aReact Hooks\u306b\u5bfe\u5fdc\u3057\u305fRedux\u306eStore\u306b\u63a5\u7d9a\u3059\u308b\u65b9\u6cd5\u304c\u5897\u3048\u307e\u3057\u305f\u3002 \u5f93\u6765\u306e\u66f8\u304d\u65b9 connect\u95a2\u6570\u3092\u4f7f\u3046\u3002 \u65b0\u3057\u3044\u66f8\u304d\u65b9 us [&hellip;]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[117],"tags":[],"_links":{"self":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/13760"}],"collection":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=13760"}],"version-history":[{"count":14,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/13760\/revisions"}],"predecessor-version":[{"id":20452,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/13760\/revisions\/20452"}],"wp:attachment":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=13760"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=13760"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=13760"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}