{"id":1930,"date":"2022-05-25T08:37:51","date_gmt":"2022-05-24T23:37:51","guid":{"rendered":"http:\/\/www.agile-software.site\/?p=1930"},"modified":"2022-05-25T08:44:12","modified_gmt":"2022-05-24T23:44:12","slug":"useselector","status":"publish","type":"post","link":"https:\/\/agile-software.net\/?p=1930","title":{"rendered":"useSelector"},"content":{"rendered":"\n<p>React Hooks\u304c\u767b\u5834\u3057\u3001redux-react\u306euseSelector Hooks\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002useSelector\u3092\u5229\u7528\u3059\u308b\u3068mapStateToProps\u3068connect\u95a2\u6570\u3092useSelector\u306b\u7f6e\u304d\u63db\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u30b3\u30fc\u30c9\u304c\u3059\u3063\u304d\u308a\u3057\u307e\u3059\u3002connect\u95a2\u6570\u3067\u306fprops\u3067state\u306e\u5024\u3092\u6e21\u3057\u3066\u3044\u307e\u3057\u305f\u304c<strong>useSelector\u3067\u306fprops\u3092\u5229\u7528\u3057\u307e\u305b\u3093\u3002<\/strong>select\u3068\u3044\u3046\u5358\u8a9e\u304cuseSelector\u306b\u306f\u542b\u307e\u308c\u3066\u3044\u308b\u3068\u304a\u308astore\u306b\u4fdd\u5b58\u3055\u308c\u3066\u3044\u308bstate\u30c7\u30fc\u30bf\u306e\u4e2d\u304b\u3089\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u3092\u9078\u629e\u3057\u3066\u53d6\u308a\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>Count\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u307f\u3067useSelector\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">connect\u3068useSelector\u306e\u9055\u3044<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">connect<\/h3>\n\n\n\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\n\n\n<ul class=\"wp-block-list\"><li>store\u3078\u306e\u30b5\u30d6\u30b9\u30af\u30e9\u30a4\u30d6<\/li><li>mapState\u3068mapDispatch\u306e\u5b9f\u884c<\/li><li>\u7d50\u5408\u3055\u308c\u305fprops\u3092\u305d\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u6e21\u3059\u3002<\/li><\/ul>\n\n\n\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\n\n\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\n\n\n<h3 class=\"wp-block-heading\">useSelector<\/h3>\n\n\n\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\n\n\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\n\n\nhttps:\/\/qiita.com\/rh_\/items\/f3ad6037c13b4c9f33e1\n","protected":false},"excerpt":{"rendered":"<p>React Hooks\u304c\u767b\u5834\u3057\u3001redux-react\u306euseSelector Hooks\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002useSelector\u3092\u5229\u7528\u3059\u308b\u3068mapStateToProps\u3068connect\u95a2\u6570\u3092useSelect<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jin_ogp_image_url":"","_jin_last_featured_id":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1930","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/agile-software.net\/index.php?rest_route=\/wp\/v2\/posts\/1930","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agile-software.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agile-software.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agile-software.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/agile-software.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1930"}],"version-history":[{"count":2,"href":"https:\/\/agile-software.net\/index.php?rest_route=\/wp\/v2\/posts\/1930\/revisions"}],"predecessor-version":[{"id":1933,"href":"https:\/\/agile-software.net\/index.php?rest_route=\/wp\/v2\/posts\/1930\/revisions\/1933"}],"wp:attachment":[{"href":"https:\/\/agile-software.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1930"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agile-software.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1930"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agile-software.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1930"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}