{"id":1336,"date":"2025-07-27T01:34:10","date_gmt":"2025-07-26T16:34:10","guid":{"rendered":"https:\/\/shinke1987.net\/?p=1336"},"modified":"2025-08-14T17:16:33","modified_gmt":"2025-08-14T08:16:33","slug":"react%e3%81%ae%e8%a8%ad%e8%a8%88%e3%83%bb%e5%ae%9f%e8%a3%85%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6%e5%80%8b%e4%ba%ba%e7%9a%84%e3%81%be%e3%81%a8%e3%82%81","status":"publish","type":"post","link":"https:\/\/shinke1987.net\/?p=1336","title":{"rendered":"React\u306e\u8a2d\u8a08\u30fb\u5b9f\u88c5\u306b\u3064\u3044\u3066\u500b\u4eba\u7684\u307e\u3068\u3081"},"content":{"rendered":"\n<h2 id=\"toc0\" class=\"wp-block-heading\">UI\u5b9f\u88c5\u306e\u30b9\u30c6\u30c3\u30d7\u307e\u3068\u3081<\/h2>\n\n\n\n<h3 id=\"toc1\" class=\"wp-block-heading\">\u53c2\u8003\u8cc7\u6599<\/h3>\n\n\n\n<p><a href=\"https:\/\/ja.react.dev\/learn\/thinking-in-react\">React\u516c\u5f0f\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\uff1aReact\u306e\u6d41\u5100<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/ja.react.dev\/learn\/you-might-not-need-an-effect\">React\u516c\u5f0f\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\uff1a\u305d\u306e\u30a8\u30d5\u30a7\u30af\u30c8\u306f\u4e0d\u8981\u304b\u3082<\/a><\/p>\n\n\n\n<h3 id=\"toc2\" class=\"wp-block-heading\">UI\u5b9f\u88c5\u6642\u306e5\u30b9\u30c6\u30c3\u30d7<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>UI\u3092\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u968e\u5c64\u306b\u5206\u5272\u3059\u308b\n<ul class=\"wp-block-list\">\n<li>\u5358\u4e00\u8cac\u4efb\u306e\u539f\u5247\u3092\u5229\u7528\u3059\u308b\u306e\u3082\u826f\u3044\u3002\n<ul class=\"wp-block-list\">\n<li>\u5358\u4e00\u8cac\u4efb\u306e\u539f\u5247\u306f\u3001\u30e2\u30b8\u30e5\u30fc\u30eb\u30fb\u30af\u30e9\u30b9\u30fb\u95a2\u6570\u306f\u5358\u4e00\u306e\u6a5f\u80fd\u306b\u3064\u3044\u3066\u8cac\u4efb\u3092\u6301\u3061\u3001\u305d\u306e\u6a5f\u80fd\u3092\u30ab\u30d7\u30bb\u30eb\u5316\u3059\u3079\u304d\u3068\u3044\u3046\u3082\u306e\u3002<\/li>\n\n\n\n<li>\u3064\u307e\u308a\u30011\u3064\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u7406\u60f3\u7684\u306b\u306f1\u3064\u306e\u3053\u3068\u3060\u3051\u3092\u884c\u3046\u3079\u304d\u3067\u3001\u3082\u3057\u5927\u304d\u304f\u306a\u3063\u305f\u3089\u3088\u308a\u5c0f\u3055\u306a\u30b5\u30d6\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u5206\u89e3\u3059\u3079\u304d\u3001\u3068\u3044\u3046\u8003\u3048\u3002<\/li>\n\n\n\n<li>JSON\u304c\u3046\u307e\u304f\u69cb\u9020\u5316\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u305d\u308c\u304cUI\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u69cb\u9020\u306b\u81ea\u7136\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308b\u3089\u3057\u3044\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>React\u3067\u9759\u7684\u306a\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u4f5c\u6210\u3059\u308b\n<ul class=\"wp-block-list\">\n<li>\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6\u306a\u8981\u7d20\u306f\u307e\u3060\u52a0\u3048\u306a\u3044\u3002\uff08JSX\u3092\u8fd4\u3059\u4ee5\u5916\u306e\u3053\u3068\u306f\u3057\u306a\u3044\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09<\/li>\n\n\n\n<li>\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u304b\u3089UI\u3092\u63cf\u753b\u3059\u308b\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u4f5c\u6210\u3059\u308b\u3002<\/li>\n\n\n\n<li>\u5358\u7d14\u306a\u3082\u306e\u306a\u3089\u30c8\u30c3\u30d7\u30c0\u30a6\u30f3\u304c\u7c21\u5358\u3002<\/li>\n\n\n\n<li>\u5927\u898f\u6a21\u306a\u3082\u306e\u306a\u3089\u30dc\u30c8\u30e0\u30a2\u30c3\u30d7\u304c\u826f\u3044\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>UI\u306e\u72b6\u614b\u3092\u6700\u5c0f\u9650\u304b\u3064\u5b8c\u5168\u306b\u8868\u73fe\u3059\u308b\u65b9\u6cd5\u3092\u898b\u3064\u3051\u308b\n<ul class=\"wp-block-list\">\n<li>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u5fc5\u8981\u3068\u3059\u308b\u72b6\u614b\u306b\u95a2\u3059\u308b\u5fc5\u8981\u6700\u5c0f\u9650\u306e\u8868\u73fe\u3092\u898b\u3064\u3051\u51fa\u3057\u3001\u4ed6\u306e\u5168\u3066\u306e\u3082\u306e\u306f\u5fc5\u8981\u306b\u306a\u3063\u305f\u3089\u305d\u306e\u5834\u3067\u8a08\u7b97\u3059\u308b\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>state\u3092\u4fdd\u6301\u3059\u3079\u304d\u5834\u6240\u3092\u7279\u5b9a\u3059\u308b\n<ul class=\"wp-block-list\">\n<li>\u6b21\u306e\u624b\u9806\u306b\u5f93\u3063\u3066\u89e3\u6c7a\u3067\u304d\u308b\u3002\n<ul class=\"wp-block-list\">\n<li>\u305d\u306estate\u306b\u57fa\u3065\u3044\u3066\u4f55\u304b\u3092\u30ec\u30f3\u30c0\u30fc\u3059\u308b\u5168\u3066\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u7279\u5b9a\u3059\u308b\u3002<\/li>\n\n\n\n<li>\u305d\u308c\u3089\u306e\u6700\u3082\u8fd1\u3044\u5171\u901a\u306e\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u898b\u3064\u3051\u308b\u3002<\/li>\n\n\n\n<li>state\u3092\u3069\u3053\u306b\u3042\u308b\u3079\u304d\u304b\u3092\u6c7a\u5b9a\u3059\u308b\u3002\n<ul class=\"wp-block-list\">\n<li>\u591a\u304f\u306e\u5834\u5408\u3001state\u3092\u305d\u306e\u5171\u901a\u306e\u89aa\u306b\u7f6e\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/li>\n\n\n\n<li>\u305d\u306e\u5171\u901a\u306e\u89aa\u306e\u66f4\u306b\u4e0a\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u7f6e\u304f\u3053\u3068\u3082\u3067\u304d\u308b\u3002<\/li>\n\n\n\n<li>state\u3092\u4fdd\u6301\u3059\u308b\u306e\u306b\u9069\u5207\u306a\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u898b\u3064\u304b\u3089\u306a\u3044\u5834\u5408\u3001state\u3092\u4fdd\u6301\u3059\u308b\u305f\u3081\u3060\u3051\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u4f5c\u6210\u3057\u3001\u5171\u901a\u306e\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u968e\u5c64\u306e\u4e0a\u306e\u3069\u3053\u304b\u306b\u8ffd\u52a0\u3059\u308b\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u9006\u65b9\u5411\u306e\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u3092\u8ffd\u52a0\u3059\u308b\n<ul class=\"wp-block-list\">\n<li>props\u3068state\u304c\u968e\u5c64\u69cb\u9020\u306e\u4e0b\u65b9\u5411\u306b\u5411\u304b\u3063\u3066\u8868\u793a\u3055\u308c\u308b\u304c\u3001\u30e6\u30fc\u30b6\u306e\u5165\u529b\u7b49\u3092\u53d7\u3051\u53d6\u308astate\u3092\u5909\u66f4\u3059\u308b\u5834\u5408\u306f\u3001\u9006\u65b9\u5411\u306e\u30c7\u30fc\u30bf\u306e\u6d41\u308c\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 id=\"toc3\" class=\"wp-block-heading\">state\u3068\u306f<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30a2\u30d7\u30ea\u304c\u8a18\u61b6\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3001\u5909\u5316\u3059\u308b\u30c7\u30fc\u30bf\u306e\u6700\u5c0f\u9650\u306e\u30bb\u30c3\u30c8\u3002<\/li>\n\n\n\n<li>\u6642\u9593\u304c\u7d4c\u3066\u3070\u5909\u308f\u308b\u3082\u306e\u3002<\/li>\n\n\n\n<li>\u89aa\u304b\u3089props\u7d4c\u7531\u3067\u6e21\u3055\u308c\u306a\u3044\u3082\u306e\u3002<\/li>\n\n\n\n<li>\u65e2\u5b58\u306estate\u3084props\u306b\u57fa\u3065\u3044\u3066\u8a08\u7b97\u53ef\u80fd\u3067\u306a\u3044\u3082\u306e\u3002<\/li>\n\n\n\n<li>state\u306e\u69cb\u9020\u3092\u8003\u3048\u308b\u4e0a\u3067\u6700\u3082\u91cd\u8981\u306a\u539f\u5247\u304cDRY(Dont&#8217;t Repeat Yourself)\u3002<\/li>\n\n\n\n<li>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306bstate\u3092\u8ffd\u52a0\u3059\u308b\u306b\u306fuseState\u30d5\u30c3\u30af\u3092\u4f7f\u7528\u3059\u308b\u3002<\/li>\n\n\n\n<li>\u540c\u3058\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u540c\u3058\u5834\u6240\u3067\u30ec\u30f3\u30c0\u30fc\u3055\u308c\u308b\u6642\u306b\u3001state\u3092\u4fdd\u6301\u3059\u308b\u3002<\/li>\n\n\n\n<li>\u540c\u3058\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u540c\u3058\u5834\u6240\u3067\u30ec\u30f3\u30c0\u30fc\u3055\u308c\u308b\u6642\u306b\u3001key\u3092\u6e21\u3059\u3053\u3068\u3067state\u3092\u5171\u6709\u3059\u3079\u304d\u3067\u306a\u3044\u7570\u306a\u308b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068\u3057\u3066React\u306b\u6271\u308f\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/li>\n<\/ul>\n\n\n\n<h3 id=\"toc4\" class=\"wp-block-heading\">\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u30ec\u30f3\u30c0\u30fc\u3055\u308c\u308b2\u3064\u306e\u8981\u56e0<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u521d\u56de\u30ec\u30f3\u30c0\u30fc<\/li>\n\n\n\n<li>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff08\u307e\u305f\u306f\u305d\u306e\u7956\u5148\u306e\u3044\u305a\u308c\u304b\uff09\u306estate\u306e\u66f4\u65b0<\/li>\n<\/ul>\n\n\n\n<h2 id=\"toc5\" class=\"wp-block-heading\">props\u3068\u306f<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u89aa\u304b\u3089\u5b50\u3078\u30c7\u30fc\u30bf\u3092\u6e21\u3059\u305f\u3081\u306e\u624b\u6bb5\u3002<\/li>\n\n\n\n<li>\u5e38\u306bprops\u306e\u5024\u304c\u56fa\u5b9a\u3068\u306f\u9650\u3089\u306a\u3044\u3002<\/li>\n\n\n\n<li>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306eprops\u304c\u5909\u308f\u3089\u306a\u3044\u3068\u3044\u3051\u306a\u3044\u5834\u5408\u3001\u89aa\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u5225\u306eprops\u3001\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6e21\u3057\u3066\u3082\u3089\u3046\u5fc5\u8981\u304c\u3042\u308b\u3002<\/li>\n\n\n\n<li>\u30ec\u30f3\u30c0\u30fc\u6bce\u306b\u65b0\u3057\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u306eprops\u3092\u53d7\u3051\u53d6\u308b\u3002<\/li>\n\n\n\n<li>props\u306f\u5b50\u304b\u3089\u66f8\u304d\u63db\u3048\u4e0d\u53ef\uff1f<\/li>\n<\/ul>\n\n\n\n<h2 id=\"toc6\" class=\"wp-block-heading\">\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u8a2d\u8a08\u30fb\u5b9f\u88c5<\/h2>\n\n\n\n<h3 id=\"toc7\" class=\"wp-block-heading\">\u53c2\u8003\u8cc7\u6599<\/h3>\n\n\n\n<p><a href=\"https:\/\/ja.react.dev\/learn\/reacting-to-input-with-state\">React\u516c\u5f0f\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\uff1astate \u3092\u4f7f\u3063\u3066\u5165\u529b\u306b\u53cd\u5fdc\u3059\u308b<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/ja.react.dev\/learn\/choosing-the-state-structure\">React\u516c\u5f0f\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\uff1astate\u69cb\u9020\u306e\u9078\u629e<\/a><\/p>\n\n\n\n<h3 id=\"toc8\" class=\"wp-block-heading\">\u5ba3\u8a00\u578bUI\u3068\u547d\u4ee4\u578bUI<\/h3>\n\n\n\n<p>\u7d50\u8ad6\uff1a\u5ba3\u8a00\u578bUI\u306e\u8003\u3048\u65b9\u3067\u7d44\u3080\u305f\u3081\u306bReact\u306f\u4f5c\u3089\u308c\u305f\u3002<\/p>\n\n\n\n<p>\u547d\u4ee4\u578bUI\u3068\u306f\u8a2d\u8a08\u30fb\u5b9f\u88c5\u304c\u3001\u6b21\u306e\u3088\u3046\u306a\u8003\u3048\u306b\u57fa\u3065\u3044\u305f\u3082\u306e\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6\u306aUI\u3092\u8a2d\u8a08\u3059\u308b\u969b\u3001\u30e6\u30fc\u30b6\u306e\u30a2\u30af\u30b7\u30e7\u30f3\u306b\u5fdc\u3058\u3066UI\u304c\u3069\u306e\u3088\u3046\u306b\u5909\u5316\u3059\u308b\u304b\u3092\u8003\u3048\u308b\u3053\u3068\u304c\u591a\u3044\u3002<\/li>\n\n\n\n<li>\u8d77\u3053\u3063\u305f\u3053\u3068\u306b\u5fdc\u3058\u3066UI\u3092\u64cd\u4f5c\u3059\u308b\u305f\u3081\u306e\u547d\u4ee4\u305d\u306e\u3082\u306e\u3092\u66f8\u304b\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u5ba3\u8a00\u578bUI\u3068\u306f\u8a2d\u8a08\u30fb\u5b9f\u88c5\u304c\u3001\u6b21\u306e\u3088\u3046\u306a\u8003\u3048\u306b\u57fa\u3065\u3044\u305f\u3082\u306e\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8868\u793a\u3057\u305f\u3044\u3082\u306e\u3092\u5ba3\u8a00\u3059\u308b\u3002\uff08\u8996\u899a\u72b6\u614b\u3054\u3068\u306bUI\u3092\u8a18\u8ff0\u3059\u308b\uff09<\/li>\n<\/ul>\n\n\n\n<h4 id=\"toc9\" class=\"wp-block-heading\">\u5ba3\u8a00\u578bUI\u5b9f\u88c5\u6642\u306e5\u30b9\u30c6\u30c3\u30d7<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u69d8\u3005\u306a\u8996\u899a\u72b6\u614b\u3092\u7279\u5b9a\u3059\u308b\n<ul class=\"wp-block-list\">\n<li>\u4f8b\uff1a\u6709\u52b9\u5316\u30fb\u7121\u52b9\u5316\u30fb\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u8868\u3059\u30b9\u30d4\u30ca\u304c\u8868\u793a\u30fb\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u8868\u793a\u7b49\u3002<\/li>\n\n\n\n<li>\u30b9\u30c6\u30fc\u30c8\u30de\u30b7\u30f3\u306e\u8003\u3048\u65b9\uff08\u72b6\u614b\u9077\u79fb\u56f3\uff09\u304c\u5f79\u7acb\u3064\u3002<\/li>\n\n\n\n<li>\u591a\u304f\u306e\u8996\u899a\u72b6\u614b\u3092\u30ea\u30b9\u30c8\u5f62\u5f0f\u3067\u8868\u793a\u3059\u308b\u3068\u308f\u304b\u308a\u3084\u3059\u304f\u306a\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u305d\u308c\u3089\u306e\u72b6\u614b\u5909\u66f4\u3092\u5f15\u304d\u8d77\u3053\u3059\u30c8\u30ea\u30ac\u3092\u6c7a\u5b9a\u3059\u308b\n<ul class=\"wp-block-list\">\n<li>\u4f8b\uff1a\u30af\u30ea\u30c3\u30af\u3055\u308c\u308b\u30fb\u5165\u529b\u3055\u308c\u308b\u30fb\u30b5\u30fc\u30d0\u304b\u3089\u306e\u30ec\u30b9\u30dd\u30f3\u30b9\u7b49\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>useState\u3092\u4f7f\u7528\u3057\u3066\u30e1\u30e2\u30ea\u4e0a\u306bstate\u3092\u8868\u73fe\u3059\u308b\n<ul class=\"wp-block-list\">\n<li>\u8003\u3048\u3089\u308c\u308b\u5168\u3066\u306e\u8996\u899a\u72b6\u614b\u3092\u78ba\u5b9f\u306b\u30ab\u30d0\u30fc\u3067\u304d\u308b\u5341\u5206\u306a\u6570\u306estate\u3092\u8ffd\u52a0\u3059\u308b\u3002<\/li>\n\n\n\n<li>state\u306e\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u306f\u30d7\u30ed\u30bb\u30b9\u306e\u4e00\u90e8\u306a\u306e\u3067\u3001\u3053\u306e\u6642\u70b9\u3067\u5b8c\u5168\u3067\u306a\u304f\u3066\u3082\u826f\u3044\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u5fc5\u8981\u4e0d\u53ef\u6b20\u3067\u306a\u3044state\u5909\u6570\u3092\u5168\u3066\u524a\u9664\u3059\u308b\uff08\u30d0\u30b0\u3084\u77db\u76fe\u3092\u907f\u3051\u308b\u305f\u3081\uff09\n<ul class=\"wp-block-list\">\n<li>\u76ee\u6a19\u306f\u3001\u30e1\u30e2\u30ea\u4e0a\u306estate\u304c\u30e6\u30fc\u30b6\u306b\u898b\u305b\u305f\u3044\u6709\u52b9\u306aUI\u3092\u8868\u73fe\u3057\u306a\u3044\u3068\u3044\u3046\u72b6\u6cc1\u3092\u9632\u3050\u3053\u3068\u3002<\/li>\n\n\n\n<li>\u6b21\u306e\u78ba\u8a8d\u3092\u3059\u308b\u3068\u826f\u3044\u3002\uff08useReducer\u306e\u5229\u7528\u3082\u691c\u8a0e\u3059\u308b\u3068\u826f\u3044\uff09\n<ul class=\"wp-block-list\">\n<li>state\u3067\u77db\u76fe\u306f\u751f\u3058\u306a\u3044\u304b\uff1f\u4f8b\uff1astateA\u3068stateB\u306e\u4e21\u65b9\u304ctrue\u3068\u306a\u308b\u3053\u3068\u306f\u3042\u308a\u3048\u306a\u3044\u306a\u3089\u3001\u305d\u308c\u3089\u306estate\u3092\u307e\u3068\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u3002<\/li>\n\n\n\n<li>\u540c\u3058\u60c5\u5831\u304c\u5225\u306estate\u304b\u3089\u5165\u624b\u3067\u304d\u306a\u3044\u304b\uff1f\u4f8b\uff1a\u30ea\u30b9\u30c8\u306e\u500b\u6570\u3092state\u306b\u4fdd\u5b58\u305b\u305a\u306b\u3001length\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u53d6\u5f97\u3059\u308b\u7b49\u3002<\/li>\n\n\n\n<li>\u5225\u306estate\u5909\u6570\u306e\u9006\u3092\u3068\u3063\u3066\u540c\u3058\u60c5\u5831\u3092\u5f97\u3089\u308c\u306a\u3044\u304b\uff1f<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u3092\u63a5\u7d9a\u3057\u3066state\u3092\u8a2d\u5b9a\u3059\u308b\u4f8b\uff1a\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u305f\u3089\u7279\u5b9a\u306estate\u304c\u66f4\u65b0\u3055\u308c\u308b\u7b49\u3002<\/li>\n<\/ul>\n\n\n\n<h3 id=\"toc10\" class=\"wp-block-heading\">state\u69cb\u9020<\/h3>\n\n\n\n<p>\u3088\u308a\u826f\u3044\u9078\u629e\u3092\u3059\u308b\u305f\u3081\u3001\u6b21\u306e5\u3064\u306e\u539f\u5247\u304c\u3042\u308b\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u539f\u5247\u306f\u30df\u30b9\u3092\u5165\u308a\u8fbc\u307e\u305b\u305a\u306b\u5bb9\u6613\u306bstate\u3092\u66f4\u65b0\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u3092\u76ee\u6a19\u3068\u3057\u3066\u3044\u308b\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u95a2\u9023\u3059\u308bstate\u3092\u30b0\u30eb\u30fc\u30d7\u5316\u3059\u308b2\u3064\u4ee5\u4e0a\u306e\u5909\u6570\u3092\u5e38\u306b\u540c\u6642\u306b\u66f4\u65b0\u3059\u308b\u5834\u5408\u3001\u305d\u308c\u3089\u3092\u5358\u4e00\u306estate\u306b\u307e\u3068\u3081\u308b\u3053\u3068\u3092\u691c\u8a0e\u3059\u308b\u3002<\/li>\n\n\n\n<li>state\u306e\u77db\u76fe\u3092\u907f\u3051\u308b\u4f8b\uff1astateA\u3068stateB\u306e\u4e21\u65b9\u304ctrue\u3068\u306a\u308b\u3053\u3068\u306f\u3042\u308a\u3048\u306a\u3044\u306a\u3089\u3001\u305d\u308c\u3089\u306estate\u3092\u307e\u3068\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u3002<\/li>\n\n\n\n<li>\u5197\u9577\u306astate\u3092\u907f\u3051\u308bprops\u3084\u4ed6\u306estate\u304b\u3089\u8a08\u7b97\u3067\u304d\u308b\u5834\u5408\u3001\u305d\u306estate\u306f\u4e0d\u8981\u3002<\/li>\n\n\n\n<li>state\u5185\u306e\u91cd\u8907\u3092\u907f\u3051\u308b\u540c\u4e00\u30c7\u30fc\u30bf\u304c\u8907\u6570\u306estate\u3084\u4ed6\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u91cd\u8907\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u305d\u308c\u3089\u3092\u540c\u671f\u3055\u305b\u308b\u306e\u306f\u56f0\u96e3\u306a\u306e\u3067\u3001\u3067\u304d\u308b\u9650\u308a\u91cd\u8907\u3092\u6e1b\u3089\u3059\u3002<\/li>\n\n\n\n<li>\u6df1\u304f\u30cd\u30b9\u30c8\u3055\u308c\u305fstate\u3092\u907f\u3051\u308b\u6df1\u3044\u968e\u5c64\u69cb\u9020\u3068\u306a\u3063\u3066\u3044\u308bstate\u306f\u66f4\u65b0\u3057\u3084\u3059\u304f\u306a\u3044\u3002\u3067\u304d\u308b\u9650\u308a\u30d5\u30e9\u30c3\u30c8\u306b\u69cb\u9020\u5316\u3059\u308b\u65b9\u6cd5\u3092\u9078\u3076\u3068\u826f\u3044\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u8ffd\u52a0\u3067\u3001\u57fa\u672c\u7684\u306bprops\u3092state\u306b\u30b3\u30d4\u30fc\u3057\u306a\u3044\u3001\u3068\u3044\u3046\u3053\u3068\u3082\u5927\u4e8b\u3067\u3001\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304b\u3089\u6e21\u3055\u308c\u305fprops\u3068\u540c\u671f\u3055\u308c\u306a\u3044\u72b6\u614b\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n\n\n\n<p>\u65b0\u3057\u3044\u5024\u304c\u6765\u3066\u3082\u7121\u8996\u3055\u308c\u308b\u3068\u3044\u3046\u3053\u3068\u3092\u660e\u793a\u3057\u305f\u3044\u5834\u5408\u3001props\u306e\u540d\u524d\u3092initial\u3084default\u3067\u59cb\u3081\u308b\u3068\u308f\u304b\u308a\u3084\u3059\u304f\u3066\u826f\u3044\u3002<\/p>\n\n\n\n<h2 id=\"toc11\" class=\"wp-block-heading\">\u30ab\u30b9\u30bf\u30e0\u30d5\u30c3\u30af<\/h2>\n\n\n\n<h3 id=\"toc12\" class=\"wp-block-heading\">\u53c2\u8003\u8cc7\u6599<\/h3>\n\n\n\n<p><a href=\"https:\/\/ja.react.dev\/learn\/reusing-logic-with-custom-hooks\">React\u516c\u5f0f\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\uff1a\u30ab\u30b9\u30bf\u30e0\u30d5\u30c3\u30af\u3067\u30ed\u30b8\u30c3\u30af\u3092\u518d\u5229\u7528\u3059\u308b<\/a><\/p>\n\n\n\n<h3 id=\"toc13\" class=\"wp-block-heading\">\u8981\u70b9<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30d5\u30c3\u30af\u306e\u540d\u524d\u306f\u5e38\u306buse\u3067\u59cb\u307e\u308b\u30ed\u30fc\u30ef\u30fc\u30ad\u30e3\u30e1\u30eb\u30b1\u30fc\u30b9\u3002<\/li>\n\n\n\n<li>\u30d5\u30c3\u30af\u3092\u547c\u3073\u51fa\u3055\u306a\u3044\u95a2\u6570\u306e\u540d\u524d\u306f\u3001use\u3067\u59cb\u3081\u306a\u3044\u3002<\/li>\n\n\n\n<li>state\u3092\u5171\u6709\u3059\u308b\u305f\u3081\u3067\u306f\u306a\u304f\u3001state\u306e\u30ed\u30b8\u30c3\u30af\u3092\u5171\u6709\u3059\u308b\u3082\u306e\u3002<\/li>\n\n\n\n<li>\u30ab\u30b9\u30bf\u30e0\u30d5\u30c3\u30af\u5185\u306e\u30b3\u30fc\u30c9\u306f\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u518d\u30ec\u30f3\u30c0\u30fc\u3054\u3068\u306b\u5b9f\u884c\u3055\u308c\u308b\u3002<\/li>\n\n\n\n<li>useEffect\u3092\u5229\u7528\u3059\u308b\u5834\u5408\u3001\u30ab\u30b9\u30bf\u30e0\u30d5\u30c3\u30af\u306b\u30e9\u30c3\u30d7\u3059\u308b\u3068\u308f\u304b\u308a\u3084\u3059\u304f\u306a\u3089\u306a\u3044\u304b\u691c\u8a0e\u3059\u308b\u3068\u826f\u3044\u3002<\/li>\n\n\n\n<li>\u30ab\u30b9\u30bf\u30e0\u30d5\u30c3\u30af\u304c\u53d7\u3051\u53d6\u308b\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u306fuseEffect\u306b\u30e9\u30c3\u30d7\u3059\u308b\u3002<\/li>\n\n\n\n<li>\u30ab\u30b9\u30bf\u30e0\u30d5\u30c3\u30af\u306e\u540d\u524d\u306f\u3001\u4f55\u3092\u3059\u308b\u306e\u304b\u3001\u4f55\u3092\u53d7\u3051\u53d6\u308b\u306e\u304b\u3001\u4f55\u3092\u8fd4\u3059\u306e\u304b\u3092\u63a8\u6e2c\u3067\u304d\u308b\u307b\u3069\u306b\u660e\u78ba\u3067\u3042\u308b\u3079\u304d\u3002<\/li>\n\n\n\n<li>\u826f\u3044\u30ab\u30b9\u30bf\u30e0\u30d5\u30c3\u30af\u306f\u3001\u52d5\u4f5c\u3092\u5236\u7d04\u3059\u308b\u3053\u3068\u3067\u547c\u3073\u51fa\u3059\u5074\u306e\u30b3\u30fc\u30c9\u3092\u3088\u308a\u5ba3\u8a00\u7684\u306b\u3059\u308b\u3082\u306e\u3002<\/li>\n<\/ul>\n\n\n\n<h2 id=\"toc14\" class=\"wp-block-heading\">\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u3068useEffect\u306e\u4f7f\u3044\u5206\u3051<\/h2>\n\n\n\n<h3 id=\"toc15\" class=\"wp-block-heading\">\u53c2\u8003\u8cc7\u6599<\/h3>\n\n\n\n<p><a href=\"https:\/\/ja.react.dev\/learn\/separating-events-from-effects\">React\u516c\u5f0f\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\uff1a\u30a8\u30d5\u30a7\u30af\u30c8\u304b\u3089\u30a4\u30d9\u30f3\u30c8\u3092\u5206\u96e2\u3059\u308b<\/a><\/p>\n\n\n\n<h3 id=\"toc16\" class=\"wp-block-heading\">\u7279\u5fb4<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\n<ul class=\"wp-block-list\">\n<li>\u30e6\u30fc\u30b6\u304c\u540c\u3058\u64cd\u4f5c\u3092\u7e70\u308a\u8fd4\u3057\u305f\u5834\u5408\u306b\u306e\u307f\u518d\u5b9f\u884c\u3055\u308c\u308b\u3002<\/li>\n\n\n\n<li>\u5177\u4f53\u7684\u306a\u30e6\u30fc\u30b6\u64cd\u4f5c\u306b\u53cd\u5fdc\u3057\u3066\u5b9f\u884c\u3055\u308c\u308b\u3002<\/li>\n\n\n\n<li>\u624b\u52d5\u3067\u30c8\u30ea\u30ac\u3055\u308c\u308b\u3082\u306e\u3002<\/li>\n\n\n\n<li>\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u5185\u306e\u30ed\u30b8\u30c3\u30af\u306f\u30ea\u30a2\u30af\u30c6\u30a3\u30d6\u3067\u306a\u3044\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u30a8\u30d5\u30a7\u30af\u30c8\n<ul class=\"wp-block-list\">\n<li>props\u3084state\u306e\u3088\u3046\u306a\u3001\u8aad\u307f\u53d6\u308b\u5024\u304c\u524d\u56de\u306e\u30ec\u30f3\u30c0\u30fc\u6642\u3068\u7570\u306a\u308b\u5834\u5408\u306b\u518d\u540c\u671f\u3092\u884c\u3044\u3001\u305d\u306e\u7d50\u679c\u518d\u63cf\u753b\u3055\u308c\u308b\u3002<\/li>\n\n\n\n<li>\u30a8\u30d5\u30a7\u30af\u30c8\u5185\u306e\u30ed\u30b8\u30c3\u30af\u306f\u30ea\u30a2\u30af\u30c6\u30a3\u30d6\u3067\u3042\u308b\u3002<\/li>\n\n\n\n<li>\u81ea\u52d5\u3067\u30c8\u30ea\u30ac\u3055\u308c\u308b\u3082\u306e\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 id=\"toc17\" class=\"wp-block-heading\">\u30a8\u30d5\u30a7\u30af\u30c8\u306b\u3064\u3044\u3066\uff08useEffect\uff09<\/h2>\n\n\n\n<h3 id=\"toc18\" class=\"wp-block-heading\">\u53c2\u8003\u8cc7\u6599<\/h3>\n\n\n\n<p><a href=\"https:\/\/ja.react.dev\/learn\/you-might-not-need-an-effect\">React\u516c\u5f0f\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\uff1a\u305d\u306e\u30a8\u30d5\u30a7\u30af\u30c8\u306f\u4e0d\u8981\u304b\u3082<\/a><\/p>\n\n\n\n<h3 id=\"toc19\" class=\"wp-block-heading\">\u4e00\u822c\u7684\u306b\u30a8\u30d5\u30a7\u30af\u30c8\u304c\u4e0d\u8981\u306a\u5834\u5408<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30ec\u30f3\u30c0\u30fc\u306e\u305f\u3081\u306e\u30c7\u30fc\u30bf\u5909\u63db\u3002<\/li>\n\n\n\n<li>\u30e6\u30fc\u30b6\u30a4\u30d9\u30f3\u30c8\u306e\u51e6\u7406\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>UI\u5b9f\u88c5\u306e\u30b9\u30c6\u30c3\u30d7\u307e\u3068\u3081 \u53c2\u8003\u8cc7\u6599 React\u516c\u5f0f\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\uff1aReact\u306e\u6d41\u5100 React\u516c\u5f0f\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\uff1a\u305d\u306e\u30a8\u30d5\u30a7\u30af\u30c8\u306f\u4e0d\u8981\u304b\u3082 UI\u5b9f\u88c5\u6642\u306e5\u30b9\u30c6\u30c3\u30d7 state\u3068\u306f \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u30ec\u30f3\u30c0\u30fc\u3055\u308c\u308b2\u3064\u306e\u8981\u56e0 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[104],"tags":[],"class_list":["post-1336","post","type-post","status-publish","format-standard","hentry","category-react"],"_links":{"self":[{"href":"https:\/\/shinke1987.net\/index.php?rest_route=\/wp\/v2\/posts\/1336","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/shinke1987.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/shinke1987.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/shinke1987.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/shinke1987.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1336"}],"version-history":[{"count":7,"href":"https:\/\/shinke1987.net\/index.php?rest_route=\/wp\/v2\/posts\/1336\/revisions"}],"predecessor-version":[{"id":1343,"href":"https:\/\/shinke1987.net\/index.php?rest_route=\/wp\/v2\/posts\/1336\/revisions\/1343"}],"wp:attachment":[{"href":"https:\/\/shinke1987.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1336"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/shinke1987.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1336"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/shinke1987.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1336"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}