{"id":12614,"date":"2026-02-24T14:38:29","date_gmt":"2026-02-24T14:38:29","guid":{"rendered":"https:\/\/withcode.tech\/media\/?p=12614"},"modified":"2026-07-01T15:29:14","modified_gmt":"2026-07-01T15:29:14","slug":"nextjs-server-components-state","status":"publish","type":"post","link":"https:\/\/withcode.tech\/media\/nextjs-server-components-state\/","title":{"rendered":"\u3010\u5b8c\u5168\u4fdd\u5b58\u7248\u3011Next.js\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u72b6\u614b\u7ba1\u7406\u3092\u5fb9\u5e95\u89e3\u8aac\uff01\u57fa\u672c\u304b\u3089\u5fdc\u7528\u307e\u3067\u5b9f\u88c5\u4f8b\u3092\u8e0f\u307e\u3048\u3066\u8a73\u3057\u304f\u89e3\u8aac"},"content":{"rendered":"\n<div class=\"wp-block-group swl-box\"><div class=\"wp-block-group__inner-container\">\n\n<h3 class=\"wp-block-heading\">\u3053\u306e\u8a18\u4e8b\u3067\u308f\u304b\u308b\u3053\u3068<\/h3>\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067 useState \u304c\u4f7f\u3048\u306a\u3044\u7406\u7531\u3068\u3001\u4ee3\u308f\u308a\u306e\u8a2d\u8a08\u601d\u60f3<\/li>\n<li>\u30c7\u30fc\u30bf\u30d5\u30a7\u30c3\u30c1\u30f3\u30b0\u30fbprops\u53d7\u3051\u6e21\u3057\u30fbServer Actions \u306b\u3088\u308b5\u3064\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3<\/li>\n<li>Context API\u30fbZustand \u306a\u3069\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u72b6\u614b\u7ba1\u7406\u306e\u6b63\u3057\u3044\u4f7f\u3044\u65b9<\/li>\n<li>\u4e26\u5217\u30d5\u30a7\u30c3\u30c1\u30f3\u30b0\u30fbSuspense \u306b\u3088\u308b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u65b9\u6cd5<\/li>\n<li>\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u3001\u305d\u306e\u5177\u4f53\u7684\u306a\u89e3\u6c7a\u7b56<\/li>\n<\/ul>\n\n<\/div><\/div>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.48.08.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>Next.js\u306e\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u72b6\u614b\u7ba1\u7406\u3063\u3066\u3069\u3046\u3084\u308b\u3093\u3067\u3059\u304b\uff1fuseState\u304c\u4f7f\u3048\u306a\u3044\u3063\u3066\u805e\u3044\u305f\u3093\u3067\u3059\u304c\u2026<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.11.23.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u3088\u30fc\u304f\u805e\u304f\u3093\u3060\u305e\uff01\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u306f\u72b6\u614b\u7ba1\u7406\u306e\u8003\u3048\u65b9\u304c\u5168\u304f\u9055\u3046\u3093\u3058\u3083\u3002\u4eca\u65e5\u306f\u305d\u306e\u9055\u3044\u304b\u3089\u5b9f\u8df5\u7684\u306a\u5b9f\u88c5\u65b9\u6cd5\u307e\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3059\u308b\u305e\u3044\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u7d50\u8ad6\u304b\u3089\u8a00\u3046\u3068\u3001Next.js \u306e\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u300c\u72b6\u614b\u7ba1\u7406\u300d\u306f\u5b58\u5728\u3057\u307e\u305b\u3093\u3002<\/strong>\u4ee3\u308f\u308a\u306b\u300c\u30c7\u30fc\u30bf\u30d5\u30a7\u30c3\u30c1\u30f3\u30b0\u300d\u3068\u300cprops \u306e\u53d7\u3051\u6e21\u3057\u300d\u3067\u30a2\u30d7\u30ea\u3092\u7d44\u307f\u7acb\u3066\u308b\u306e\u304c\u6b63\u89e3\u3067\u3059\u3002\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6\u306a\u64cd\u4f5c\u304c\u5fc5\u8981\u306a\u7b87\u6240\u3060\u3051\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u5207\u308a\u51fa\u3057\u3001Server Actions \u3067\u30c7\u30fc\u30bf\u3092\u5909\u66f4\u3059\u308b\u8a2d\u8a08\u304c\u3001App Router \u6642\u4ee3\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u672c\u8a18\u4e8b\u3067\u306f\u3001<strong><span class=\"swl-marker mark_yellow\">Next.js \u306e\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u304a\u3051\u308b\u72b6\u614b\u7ba1\u7406\u306e\u8003\u3048\u65b9\u304b\u3089\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068\u306e\u4f7f\u3044\u5206\u3051\u307e\u3067<\/span><\/strong>\u3001\u5b9f\u8df5\u7684\u306a\u5b9f\u88c5\u4f8b\u3092\u4ea4\u3048\u3066\u5fb9\u5e95\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Next.js \u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068\u306f\uff1f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u57fa\u672c\u6982\u5ff5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff08React Server Components\uff09\u306f\u3001<strong>\u30b5\u30fc\u30d0\u30fc\u5074\u3067\u306e\u307f\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u3001JavaScript \u30d0\u30f3\u30c9\u30eb\u306b\u542b\u307e\u308c\u306a\u3044 React \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/strong>\u3067\u3059\u3002\u5f93\u6765\u306e SSR \u3068\u306f\u7570\u306a\u308a\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5358\u4f4d\u3067\u30b5\u30fc\u30d0\u30fc\u30fb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3092\u5206\u3051\u3089\u308c\u308b\u306e\u304c\u7279\u5fb4\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Next.js 13 \u306e App Router \u3067\u306f\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u3059\u3079\u3066\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068\u3057\u3066\u6271\u308f\u308c\u307e\u3059\u3002\u4e3b\u306a\u30e1\u30ea\u30c3\u30c8\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u30d0\u30f3\u30c9\u30eb\u30b5\u30a4\u30ba\u306e\u524a\u6e1b<\/strong>\uff1a\u30b5\u30fc\u30d0\u30fc\u3067\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u308b\u305f\u3081\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u9001\u308b JavaScript \u304c\u5927\u5e45\u306b\u6e1b\u308b<\/li>\n<li><strong>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3078\u306e\u76f4\u63a5\u30a2\u30af\u30bb\u30b9<\/strong>\uff1aORM \u3084\u79d8\u5bc6\u60c5\u5831\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u9732\u51fa\u305b\u305a\u30b5\u30fc\u30d0\u30fc\u5074\u3067\u51e6\u7406\u3067\u304d\u308b<\/li>\n<li><strong>\u521d\u671f\u8868\u793a\u306e\u9ad8\u901f\u5316<\/strong>\uff1a\u5b8c\u5168\u306a HTML \u3092\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u8fd4\u3059\u305f\u3081 FCP \u304c\u5411\u4e0a\u3059\u308b<\/li>\n<li><strong>SEO \u6700\u9069\u5316<\/strong>\uff1a\u30af\u30ed\u30fc\u30e9\u30fc\u304c HTML \u5168\u4f53\u3092\u53d6\u5f97\u3067\u304d\u308b<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u9055\u3044<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u7279\u5fb4<\/th><th>\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/th><th>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/th><\/tr><\/thead><tbody><tr><td>\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u5834\u6240<\/td><td>\u30b5\u30fc\u30d0\u30fc\u5074\u306e\u307f<\/td><td>\u30b5\u30fc\u30d0\u30fc\uff0b\u30af\u30e9\u30a4\u30a2\u30f3\u30c8<\/td><\/tr><tr><td>\u72b6\u614b\u7ba1\u7406<\/td><td>useState\u30fbuseEffect \u7b49\u306f\u4f7f\u7528\u4e0d\u53ef<\/td><td>\u3059\u3079\u3066\u306e React Hooks \u304c\u4f7f\u7528\u53ef\u80fd<\/td><\/tr><tr><td>\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9<\/td><td>\u4f7f\u7528\u4e0d\u53ef<\/td><td>\u4f7f\u7528\u53ef\u80fd\uff08onClick \u7b49\uff09<\/td><\/tr><tr><td>\u30d0\u30f3\u30c9\u30eb\u30b5\u30a4\u30ba<\/td><td>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u542b\u307e\u308c\u306a\u3044<\/td><td>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u542b\u307e\u308c\u308b<\/td><\/tr><tr><td>\u30c7\u30fc\u30bf\u30a2\u30af\u30bb\u30b9<\/td><td>DB \u76f4\u63a5\u30a2\u30af\u30bb\u30b9\u53ef\u80fd<\/td><td>API \u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u7d4c\u7531<\/td><\/tr><tr><td>\u5ba3\u8a00\u65b9\u6cd5<\/td><td>\u30c7\u30d5\u30a9\u30eb\u30c8\uff08\u7279\u5225\u306a\u5ba3\u8a00\u4e0d\u8981\uff09<\/td><td>\u30d5\u30a1\u30a4\u30eb\u5148\u982d\u306b <code>'use client'<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u304a\u3051\u308b\u72b6\u614b\u7ba1\u7406\u306e\u8003\u3048\u65b9<\/h2>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.48.08.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u72b6\u614b\u7ba1\u7406\u304c\u3067\u304d\u306a\u3044\u306a\u3089\u3001\u3069\u3046\u3084\u3063\u3066\u30c7\u30fc\u30bf\u3092\u6271\u3048\u3070\u826f\u3044\u3093\u3067\u3059\u304b\uff1f<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.11.23.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u826f\u3044\u8cea\u554f\u3058\u3083\uff01\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u306f\u300c\u72b6\u614b\u300d\u3068\u3044\u3046\u6982\u5ff5\u3067\u306f\u306a\u304f\u3001\u300c\u30c7\u30fc\u30bf\u30d5\u30a7\u30c3\u30c1\u30f3\u30b0\u300d\u3068\u300cprops\u306e\u53d7\u3051\u6e21\u3057\u300d\u3067\u8003\u3048\u308b\u3093\u3058\u3083\u3088<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u306f\u300c\u72b6\u614b\u300d\u3067\u306f\u306a\u304f\u300c\u30c7\u30fc\u30bf\u300d\u3092\u6271\u3046<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u3082\u91cd\u8981\u306a\u8003\u3048\u65b9\u306e\u8ee2\u63db\u306f\u3001<strong><span class=\"swl-marker mark_yellow\">\u300c\u72b6\u614b\u7ba1\u7406\u300d\u304b\u3089\u300c\u30c7\u30fc\u30bf\u7ba1\u7406\u300d\u3078\u306e\u30b7\u30d5\u30c8<\/span><\/strong>\u3067\u3059\u3002\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u306f\u6b21\u306e3\u30b9\u30c6\u30c3\u30d7\u3067\u8003\u3048\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30c7\u30fc\u30bf\u306f\u30b5\u30fc\u30d0\u30fc\u3067\u53d6\u5f97\u3059\u308b<\/strong>\uff1aDB \u3084 API \u304b\u3089\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u3092\u30b5\u30fc\u30d0\u30fc\u5074\u3067\u53d6\u5f97<\/li>\n<li><strong>props \u3068\u3057\u3066\u5b50\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u6e21\u3059<\/strong>\uff1a\u53d6\u5f97\u3057\u305f\u30c7\u30fc\u30bf\u3092\u4e0b\u4f4d\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3078\u53d7\u3051\u6e21\u3059<\/li>\n<li><strong>\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6\u306a\u90e8\u5206\u306e\u307f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5316<\/strong>\uff1a\u30e6\u30fc\u30b6\u30fc\u64cd\u4f5c\u304c\u5fc5\u8981\u306a\u7b87\u6240\u3060\u3051\u3092\u5207\u308a\u51fa\u3059<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u3067\u304d\u308b\u3053\u3068\u30fb\u3067\u304d\u306a\u3044\u3053\u3068<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">\u2705 \u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u3067\u304d\u308b\u3053\u3068<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>async\/await \u3092\u4f7f\u3063\u305f\u975e\u540c\u671f\u30c7\u30fc\u30bf\u30d5\u30a7\u30c3\u30c1\u30f3\u30b0<\/li>\n<li>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3078\u306e\u76f4\u63a5\u30a2\u30af\u30bb\u30b9\uff08Prisma\u30fbDrizzle \u7b49\u306e ORM\uff09<\/li>\n<li>\u30b5\u30fc\u30d0\u30fc\u5074\u306e\u307f\u306e\u74b0\u5883\u5909\u6570\u30fb\u79d8\u5bc6\u60c5\u5831\u3078\u306e\u30a2\u30af\u30bb\u30b9<\/li>\n<li>fs\u30fbpath \u7b49\u306e Node.js \u6a19\u6e96\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u4f7f\u7528<\/li>\n<li>\u91cd\u3044\u8a08\u7b97\u51e6\u7406\uff08\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5f71\u97ff\u3057\u306a\u3044\uff09<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u274c \u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u3067\u304d\u306a\u3044\u3053\u3068<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>useState\u30fbuseReducer \u7b49\u306e\u72b6\u614b\u7ba1\u7406\u30d5\u30c3\u30af<\/li>\n<li>useEffect\u30fbuseLayoutEffect \u7b49\u306e\u526f\u4f5c\u7528\u30d5\u30c3\u30af<\/li>\n<li>onClick\u30fbonChange \u7b49\u306e\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9<\/li>\n<li>window\u30fbdocument\u30fblocalStorage \u7b49\u306e\u30d6\u30e9\u30a6\u30b6 API<\/li>\n<li>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5c02\u7528\u306e\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30e9\u30a4\u30d6\u30e9\u30ea<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u306e\u30c7\u30fc\u30bf\u7ba1\u7406\u30d1\u30bf\u30fc\u30f3<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f31\uff1a\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u306e\u30c7\u30fc\u30bf\u30d5\u30a7\u30c3\u30c1\u30f3\u30b0<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u3082\u57fa\u672c\u7684\u306a\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5185\u3067\u76f4\u63a5\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3057\u3001\u305d\u306e\u307e\u307e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ app\/posts\/page.tsx\uff08\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09\nimport { db } from '@\/lib\/database'\n\n\/\/ \u975e\u540c\u671f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068\u3057\u3066\u5b9a\u7fa9\nasync function PostsPage() {\n  \/\/ \u30b5\u30fc\u30d0\u30fc\u5074\u3067\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\n  const posts = await db.post.findMany({\n    orderBy: { createdAt: 'desc' },\n    take: 10\n  })\n\n  return (\n    &lt;div&gt;\n      &lt;h1&gt;\u6700\u65b0\u306e\u6295\u7a3f&lt;\/h1&gt;\n      &lt;ul&gt;\n        {posts.map((post) =&gt; (\n          &lt;li key={post.id}&gt;\n            &lt;h2&gt;{post.title}&lt;\/h2&gt;\n            &lt;p&gt;{post.excerpt}&lt;\/p&gt;\n          &lt;\/li&gt;\n        ))}\n      &lt;\/ul&gt;\n    &lt;\/div&gt;\n  )\n}\n\nexport default PostsPage<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u30dd\u30a4\u30f3\u30c8\u306f3\u70b9\u3067\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>async \u95a2\u6570\u3068\u3057\u3066\u5b9a\u7fa9<\/strong>\uff1a\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u975e\u540c\u671f\u95a2\u6570\u306b\u3067\u304d\u308b<\/li>\n<li><strong>await \u3067\u30c7\u30fc\u30bf\u53d6\u5f97<\/strong>\uff1aDB \u304b\u3089\u76f4\u63a5\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3057\u3066\u7d50\u679c\u3092\u5f85\u3064<\/li>\n<li><strong>\u53d6\u5f97\u3057\u305f\u30c7\u30fc\u30bf\u3092\u76f4\u63a5\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/strong>\uff1a\u72b6\u614b\u7ba1\u7406\u3092\u4ecb\u3055\u305a JSX \u3067\u305d\u306e\u307e\u307e\u4f7f\u3046<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f32\uff1aprops \u306b\u3088\u308b\u30c7\u30fc\u30bf\u306e\u53d7\u3051\u6e21\u3057<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u9593\u3067\u30c7\u30fc\u30bf\u3092\u5171\u6709\u3059\u308b\u5834\u5408\u306f\u3001props \u3092\u4f7f\u3063\u3066\u53d7\u3051\u6e21\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ app\/posts\/[id]\/page.tsx\uff08\u89aa\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09\nimport { db } from '@\/lib\/database'\nimport PostDetail from '@\/components\/PostDetail'\nimport RelatedPosts from '@\/components\/RelatedPosts'\n\nasync function PostPage({ params }: { params: { id: string } }) {\n  \/\/ \u6295\u7a3f\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\n  const post = await db.post.findUnique({\n    where: { id: params.id },\n    include: { author: true, category: true }\n  })\n\n  if (!post) {\n    return &lt;div&gt;\u6295\u7a3f\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093&lt;\/div&gt;\n  }\n\n  \/\/ \u95a2\u9023\u6295\u7a3f\u3082\u53d6\u5f97\n  const relatedPosts = await db.post.findMany({\n    where: {\n      categoryId: post.categoryId,\n      id: { not: post.id }\n    },\n    take: 5\n  })\n\n  return (\n    &lt;div&gt;\n      {\/* props\u3068\u3057\u3066\u30c7\u30fc\u30bf\u3092\u6e21\u3059 *\/}\n      &lt;PostDetail post={post} \/&gt;\n      &lt;RelatedPosts posts={relatedPosts} \/&gt;\n    &lt;\/div&gt;\n  )\n}\n\nexport default PostPage<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ components\/PostDetail.tsx\uff08\u5b50\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09\ntype Post = {\n  id: string\n  title: string\n  content: string\n  author: {\n    name: string\n    avatar: string\n  }\n  createdAt: Date\n}\n\nfunction PostDetail({ post }: { post: Post }) {\n  return (\n    &lt;article&gt;\n      &lt;h1&gt;{post.title}&lt;\/h1&gt;\n      &lt;div&gt;\n        &lt;img src={post.author.avatar} alt={post.author.name} \/&gt;\n        &lt;span&gt;{post.author.name}&lt;\/span&gt;\n        &lt;time&gt;{post.createdAt.toLocaleDateString()}&lt;\/time&gt;\n      &lt;\/div&gt;\n      &lt;div dangerouslySetInnerHTML={{ __html: post.content }} \/&gt;\n    &lt;\/article&gt;\n  )\n}\n\nexport default PostDetail<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u30d1\u30bf\u30fc\u30f3\u306b\u3088\u308a\u3001<strong>\u30c7\u30fc\u30bf\u53d6\u5f97\u306e\u30ed\u30b8\u30c3\u30af\u3068\u8868\u793a\u30ed\u30b8\u30c3\u30af\u3092\u5206\u96e2<\/strong>\u3067\u304d\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u518d\u5229\u7528\u6027\u304c\u9ad8\u307e\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f33\uff1aServer Actions \u3092\u4f7f\u3063\u305f\u30c7\u30fc\u30bf\u5909\u66f4<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30c7\u30fc\u30bf\u306e\u4f5c\u6210\u30fb\u66f4\u65b0\u30fb\u524a\u9664\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f Server Actions \u3092\u4f7f\u7528\u3057\u307e\u3059\u3002API \u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u3092\u5225\u9014\u4f5c\u6210\u305b\u305a\u306b\u3001\u578b\u5b89\u5168\u306b\u30b5\u30fc\u30d0\u30fc\u5074\u51e6\u7406\u3092\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ app\/actions\/post.ts\uff08Server Actions\uff09\n'use server'\n\nimport { db } from '@\/lib\/database'\nimport { revalidatePath } from 'next\/cache'\n\n\/\/ \u6295\u7a3f\u3092\u4f5c\u6210\u3059\u308b\u30a2\u30af\u30b7\u30e7\u30f3\nexport async function createPost(formData: FormData) {\n  const title = formData.get('title') as string\n  const content = formData.get('content') as string\n  const authorId = formData.get('authorId') as string\n\n  \/\/ \u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\n  if (!title || !content) {\n    return { error: '\u30bf\u30a4\u30c8\u30eb\u3068\u5185\u5bb9\u306f\u5fc5\u9808\u3067\u3059' }\n  }\n\n  try {\n    \/\/ \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u4fdd\u5b58\n    const post = await db.post.create({\n      data: {\n        title,\n        content,\n        authorId\n      }\n    })\n\n    \/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u66f4\u65b0\n    revalidatePath('\/posts')\n\n    return { success: true, post }\n  } catch (error) {\n    return { error: '\u6295\u7a3f\u306e\u4f5c\u6210\u306b\u5931\u6557\u3057\u307e\u3057\u305f' }\n  }\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ components\/PostForm.tsx\uff08\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09\n'use client'\n\nimport { createPost } from '@\/app\/actions\/post'\nimport { useState } from 'react'\n\nfunction PostForm({ authorId }: { authorId: string }) {\n  const [message, setMessage] = useState('')\n\n  async function handleSubmit(formData: FormData) {\n    const result = await createPost(formData)\n\n    if (result.error) {\n      setMessage(result.error)\n    } else {\n      setMessage('\u6295\u7a3f\u3092\u4f5c\u6210\u3057\u307e\u3057\u305f\uff01')\n    }\n  }\n\n  return (\n    &lt;form action={handleSubmit}&gt;\n      &lt;input type=\"hidden\" name=\"authorId\" value={authorId} \/&gt;\n\n      &lt;div&gt;\n        &lt;label htmlFor=\"title\"&gt;\u30bf\u30a4\u30c8\u30eb&lt;\/label&gt;\n        &lt;input type=\"text\" id=\"title\" name=\"title\" required \/&gt;\n      &lt;\/div&gt;\n\n      &lt;div&gt;\n        &lt;label htmlFor=\"content\"&gt;\u5185\u5bb9&lt;\/label&gt;\n        &lt;textarea id=\"content\" name=\"content\" required \/&gt;\n      &lt;\/div&gt;\n\n      &lt;button type=\"submit\"&gt;\u6295\u7a3f\u3059\u308b&lt;\/button&gt;\n\n      {message && &lt;p&gt;{message}&lt;\/p&gt;}\n    &lt;\/form&gt;\n  )\n}\n\nexport default PostForm<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Server Actions \u306e\u4ed5\u7d44\u307f\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>&#8216;use server&#8217; \u30c7\u30a3\u30ec\u30af\u30c6\u30a3\u30d6<\/strong>\uff1a\u30d5\u30a1\u30a4\u30eb\u5148\u982d\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u3001\u305d\u306e\u95a2\u6570\u304c\u30b5\u30fc\u30d0\u30fc\u3067\u306e\u307f\u5b9f\u884c\u3055\u308c\u308b\u3053\u3068\u3092\u793a\u3059<\/li>\n<li><strong>\u30d5\u30a9\u30fc\u30e0\u30c7\u30fc\u30bf\u306e\u51e6\u7406<\/strong>\uff1aFormData \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089\u5024\u3092\u53d6\u5f97\u3057\u3001\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u3092\u884c\u3046<\/li>\n<li><strong>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u64cd\u4f5c<\/strong>\uff1a\u30b5\u30fc\u30d0\u30fc\u5074\u3067 DB \u306b\u76f4\u63a5\u30a2\u30af\u30bb\u30b9\u3057\u3066\u64cd\u4f5c\u3092\u5b9f\u884c<\/li>\n<li><strong>revalidatePath<\/strong>\uff1a\u6307\u5b9a\u30d1\u30b9\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u7121\u52b9\u5316\u3057\u3001\u6700\u65b0\u30c7\u30fc\u30bf\u304c\u8868\u793a\u3055\u308c\u308b\u3088\u3046\u306b\u3059\u308b<\/li>\n<li><strong>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304b\u3089\u547c\u3073\u51fa\u3057<\/strong>\uff1a&#8217;use client&#8217; \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304b\u3089 Server Actions \u3092\u547c\u3073\u51fa\u3057\u3066\u7d50\u679c\u306b\u5fdc\u3058\u305f\u72b6\u614b\u7ba1\u7406\u3092\u884c\u3046<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u65b9\u6cd5\u306b\u3088\u308a\u3001<strong><span class=\"swl-marker mark_yellow\">API \u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u3092\u4f5c\u6210\u305b\u305a\u306b\u3001\u578b\u5b89\u5168\u306b\u30b5\u30fc\u30d0\u30fc\u5074\u306e\u51e6\u7406\u3092\u5b9f\u884c\u3067\u304d\u307e\u3059<\/span><\/strong>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068\u306e\u9023\u643a\u30d1\u30bf\u30fc\u30f3<\/h2>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.48.08.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u30e6\u30fc\u30b6\u30fc\u306e\u64cd\u4f5c\u306b\u5fdc\u3058\u3066\u8868\u793a\u3092\u5909\u3048\u305f\u3044\u5834\u5408\u306f\u3069\u3046\u3059\u308c\u3070\u826f\u3044\u3093\u3067\u3059\u304b\uff1f<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.11.23.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u305d\u3046\u3044\u3046\u6642\u306f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u51fa\u756a\u3058\u3083\uff01\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u306e\u304c\u30dd\u30a4\u30f3\u30c8\u306a\u3093\u3058\u3083\u3088<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f34\uff1a\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304b\u3089\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3078\u306e props \u6e21\u3057<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6\u306a\u6a5f\u80fd\u304c\u5fc5\u8981\u306a\u90e8\u5206\u3060\u3051\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5316\u3057\u3001\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304b\u3089 props \u3067\u30c7\u30fc\u30bf\u3092\u6e21\u3059\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ app\/dashboard\/page.tsx\uff08\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09\nimport { db } from '@\/lib\/database'\nimport { auth } from '@\/lib\/auth'\nimport StatisticsChart from '@\/components\/StatisticsChart'\nimport TodoList from '@\/components\/TodoList'\n\nasync function DashboardPage() {\n  \/\/ \u8a8d\u8a3c\u60c5\u5831\u3092\u53d6\u5f97\n  const session = await auth()\n\n  if (!session?.user) {\n    redirect('\/login')\n  }\n\n  \/\/ \u30b5\u30fc\u30d0\u30fc\u5074\u3067\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\n  const [statistics, todos] = await Promise.all([\n    db.statistics.findMany({\n      where: { userId: session.user.id },\n      orderBy: { date: 'desc' },\n      take: 30\n    }),\n    db.todo.findMany({\n      where: { userId: session.user.id, completed: false },\n      orderBy: { priority: 'desc' }\n    })\n  ])\n\n  return (\n    &lt;div&gt;\n      &lt;h1&gt;\u30c0\u30c3\u30b7\u30e5\u30dc\u30fc\u30c9&lt;\/h1&gt;\n\n      {\/* \u30b5\u30fc\u30d0\u30fc\u3067\u53d6\u5f97\u3057\u305f\u30c7\u30fc\u30bf\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u6e21\u3059 *\/}\n      &lt;StatisticsChart data={statistics} \/&gt;\n      &lt;TodoList initialTodos={todos} userId={session.user.id} \/&gt;\n    &lt;\/div&gt;\n  )\n}\n\nexport default DashboardPage<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ components\/StatisticsChart.tsx\uff08\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09\n'use client'\n\nimport { useState } from 'react'\nimport { Line } from 'react-chartjs-2'\n\ntype Statistics = {\n  date: Date\n  value: number\n}\n\nfunction StatisticsChart({ data }: { data: Statistics[] }) {\n  const [period, setPeriod] = useState&lt;'week' | 'month'&gt;('week')\n\n  \/\/ \u30c7\u30fc\u30bf\u3092\u671f\u9593\u3067\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\n  const filteredData = data.filter((item) =&gt; {\n    const daysDiff = Math.floor(\n      (Date.now() - item.date.getTime()) \/ (1000 * 60 * 60 * 24)\n    )\n    return period === 'week' ? daysDiff &lt;= 7 : daysDiff &lt;= 30\n  })\n\n  \/\/ \u30c1\u30e3\u30fc\u30c8\u7528\u306e\u30c7\u30fc\u30bf\u5f62\u5f0f\u306b\u5909\u63db\n  const chartData = {\n    labels: filteredData.map((item) =&gt;\n      item.date.toLocaleDateString('ja-JP')\n    ),\n    datasets: [\n      {\n        label: '\u7d71\u8a08\u30c7\u30fc\u30bf',\n        data: filteredData.map((item) =&gt; item.value),\n        borderColor: 'rgb(75, 192, 192)',\n        tension: 0.1\n      }\n    ]\n  }\n\n  return (\n    &lt;div&gt;\n      &lt;div&gt;\n        &lt;button\n          onClick={() =&gt; setPeriod('week')}\n          className={period === 'week' ? 'active' : ''}\n        &gt;\n          \u9031\u9593\n        &lt;\/button&gt;\n        &lt;button\n          onClick={() =&gt; setPeriod('month')}\n          className={period === 'month' ? 'active' : ''}\n        &gt;\n          \u6708\u9593\n        &lt;\/button&gt;\n      &lt;\/div&gt;\n\n      &lt;Line data={chartData} \/&gt;\n    &lt;\/div&gt;\n  )\n}\n\nexport default StatisticsChart<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u8a2d\u8a08\u306b\u3088\u308a\u3001<strong>\u521d\u671f\u30c7\u30fc\u30bf\u306e\u53d6\u5f97\u306f\u30b5\u30fc\u30d0\u30fc\u5074\u3067\u9ad8\u901f\u306b\u884c\u3044\u3001\u30e6\u30fc\u30b6\u30fc\u64cd\u4f5c\u306b\u3088\u308b\u8868\u793a\u5909\u66f4\u306f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\u3067\u30b9\u30e0\u30fc\u30ba\u306b\u51e6\u7406<\/strong>\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f35\uff1a\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u306e\u72b6\u614b\u7ba1\u7406\u3068 Server Actions \u306e\u7d44\u307f\u5408\u308f\u305b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u3088\u308a\u8907\u96d1\u306a\u72b6\u614b\u7ba1\u7406\u306b\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067 useState\u30fbuseReducer \u3092\u4f7f\u3044\u3064\u3064\u3001\u30c7\u30fc\u30bf\u306e\u6c38\u7d9a\u5316\u306f Server Actions \u3067\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ components\/TodoList.tsx\uff08\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09\n'use client'\n\nimport { useState, useOptimistic } from 'react'\nimport { toggleTodo, deleteTodo } from '@\/app\/actions\/todo'\n\ntype Todo = {\n  id: string\n  title: string\n  completed: boolean\n}\n\nfunction TodoList({\n  initialTodos,\n  userId\n}: {\n  initialTodos: Todo[]\n  userId: string\n}) {\n  \/\/ \u30ed\u30fc\u30ab\u30eb\u72b6\u614b\u3067TODO\u30ea\u30b9\u30c8\u3092\u7ba1\u7406\n  const [todos, setTodos] = useState(initialTodos)\n\n  \/\/ \u697d\u89b3\u7684\u66f4\u65b0\u306e\u305f\u3081\u306e\u72b6\u614b\n  const [optimisticTodos, addOptimisticTodo] = useOptimistic(\n    todos,\n    (state, newTodo: Todo) =&gt; [...state, newTodo]\n  )\n\n  \/\/ TODO\u5b8c\u4e86\/\u672a\u5b8c\u4e86\u306e\u5207\u308a\u66ff\u3048\n  async function handleToggle(id: string) {\n    \/\/ \u697d\u89b3\u7684\u306bUI\u3092\u66f4\u65b0\n    setTodos((prev) =&gt;\n      prev.map((todo) =&gt;\n        todo.id === id ? { ...todo, completed: !todo.completed } : todo\n      )\n    )\n\n    \/\/ \u30b5\u30fc\u30d0\u30fc\u306b\u5909\u66f4\u3092\u4fdd\u5b58\n    const result = await toggleTodo(id)\n\n    if (result.error) {\n      \/\/ \u30a8\u30e9\u30fc\u306e\u5834\u5408\u306f\u5143\u306b\u623b\u3059\n      setTodos((prev) =&gt;\n        prev.map((todo) =&gt;\n          todo.id === id ? { ...todo, completed: !todo.completed } : todo\n        )\n      )\n      alert(result.error)\n    }\n  }\n\n  \/\/ TODO\u524a\u9664\n  async function handleDelete(id: string) {\n    \/\/ \u697d\u89b3\u7684\u306bUI\u304b\u3089\u524a\u9664\n    setTodos((prev) =&gt; prev.filter((todo) =&gt; todo.id !== id))\n\n    \/\/ \u30b5\u30fc\u30d0\u30fc\u3067\u524a\u9664\n    const result = await deleteTodo(id)\n\n    if (result.error) {\n      \/\/ \u30a8\u30e9\u30fc\u306e\u5834\u5408\u306f\u5143\u306b\u623b\u3059\uff08\u672c\u6765\u306f\u524a\u9664\u524d\u306e\u72b6\u614b\u3092\u4fdd\u6301\u3059\u3079\u304d\uff09\n      alert(result.error)\n    }\n  }\n\n  return (\n    &lt;div&gt;\n      &lt;h2&gt;TODO\u30ea\u30b9\u30c8&lt;\/h2&gt;\n      &lt;ul&gt;\n        {optimisticTodos.map((todo) =&gt; (\n          &lt;li key={todo.id}&gt;\n            &lt;input\n              type=\"checkbox\"\n              checked={todo.completed}\n              onChange={() =&gt; handleToggle(todo.id)}\n            \/&gt;\n            &lt;span style={{\n              textDecoration: todo.completed ? 'line-through' : 'none'\n            }}&gt;\n              {todo.title}\n            &lt;\/span&gt;\n            &lt;button onClick={() =&gt; handleDelete(todo.id)}&gt;\n              \u524a\u9664\n            &lt;\/button&gt;\n          &lt;\/li&gt;\n        ))}\n      &lt;\/ul&gt;\n    &lt;\/div&gt;\n  )\n}\n\nexport default TodoList<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ app\/actions\/todo.ts\uff08Server Actions\uff09\n'use server'\n\nimport { db } from '@\/lib\/database'\nimport { revalidatePath } from 'next\/cache'\n\nexport async function toggleTodo(id: string) {\n  try {\n    const todo = await db.todo.findUnique({ where: { id } })\n\n    if (!todo) {\n      return { error: 'TODO\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093' }\n    }\n\n    await db.todo.update({\n      where: { id },\n      data: { completed: !todo.completed }\n    })\n\n    revalidatePath('\/dashboard')\n    return { success: true }\n  } catch (error) {\n    return { error: '\u66f4\u65b0\u306b\u5931\u6557\u3057\u307e\u3057\u305f' }\n  }\n}\n\nexport async function deleteTodo(id: string) {\n  try {\n    await db.todo.delete({ where: { id } })\n    revalidatePath('\/dashboard')\n    return { success: true }\n  } catch (error) {\n    return { error: '\u524a\u9664\u306b\u5931\u6557\u3057\u307e\u3057\u305f' }\n  }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u9ad8\u5ea6\u306a\u30c6\u30af\u30cb\u30c3\u30af\u306e\u30dd\u30a4\u30f3\u30c8\u3067\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>useOptimistic \u30d5\u30c3\u30af<\/strong>\uff1aReact 19 \u3067\u5c0e\u5165\u3055\u308c\u305f\u697d\u89b3\u7684\u66f4\u65b0\u3092\u5b9f\u73fe\u3059\u308b\u30d5\u30c3\u30af\u3002\u30b5\u30fc\u30d0\u30fc\u306e\u5fdc\u7b54\u3092\u5f85\u305f\u305a\u306b UI \u3092\u5373\u5ea7\u306b\u66f4\u65b0\u3067\u304d\u308b<\/li>\n<li><strong>\u697d\u89b3\u7684\u66f4\u65b0\u306e\u5b9f\u88c5<\/strong>\uff1a\u30c1\u30a7\u30c3\u30af\u30dc\u30c3\u30af\u30b9\u3092\u30af\u30ea\u30c3\u30af\u3057\u305f\u77ac\u9593\u306b UI \u3092\u66f4\u65b0\u3057\u3001\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u3067\u30b5\u30fc\u30d0\u30fc\u306b\u4fdd\u5b58<\/li>\n<li><strong>\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0<\/strong>\uff1a\u30b5\u30fc\u30d0\u30fc\u5074\u3067\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306f UI \u3092\u5143\u306e\u72b6\u614b\u306b\u623b\u3059<\/li>\n<li><strong>Server Actions \u3068\u306e\u9023\u643a<\/strong>\uff1a\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\u306e\u72b6\u614b\u7ba1\u7406\u3068\u30b5\u30fc\u30d0\u30fc\u5074\u306e\u30c7\u30fc\u30bf\u6c38\u7d9a\u5316\u3092\u30b7\u30fc\u30e0\u30ec\u30b9\u306b\u9023\u643a<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u65b9\u6cd5\u306b\u3088\u308a\u3001<strong><span class=\"swl-marker mark_yellow\">\u30e6\u30fc\u30b6\u30fc\u306b\u3068\u3063\u3066\u5feb\u9069\u306a\u64cd\u4f5c\u611f\u3092\u4fdd\u3061\u306a\u304c\u3089\u3001\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u3082\u62c5\u4fdd<\/span><\/strong>\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u30b0\u30ed\u30fc\u30d0\u30eb\u72b6\u614b\u7ba1\u7406\u306e\u6226\u7565<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u6df7\u5728\u3059\u308b\u74b0\u5883\u3067\u306f\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u72b6\u614b\u7ba1\u7406\u306e\u6226\u7565\u3082\u5909\u308f\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f36\uff1aContext API \u306e\u4f7f\u7528\uff08\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5c02\u7528\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Context API \u306f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u9593\u3067\u306e\u307f\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ contexts\/ThemeContext.tsx\uff08\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09\n'use client'\n\nimport { createContext, useContext, useState, ReactNode } from 'react'\n\ntype Theme = 'light' | 'dark'\n\ntype ThemeContextType = {\n  theme: Theme\n  toggleTheme: () =&gt; void\n}\n\nconst ThemeContext = createContext&lt;ThemeContextType | undefined&gt;(undefined)\n\nexport function ThemeProvider({ children }: { children: ReactNode }) {\n  const [theme, setTheme] = useState&lt;Theme&gt;('light')\n\n  const toggleTheme = () =&gt; {\n    setTheme((prev) =&gt; (prev === 'light' ? 'dark' : 'light'))\n  }\n\n  return (\n    &lt;ThemeContext.Provider value={{ theme, toggleTheme }}&gt;\n      {children}\n    &lt;\/ThemeContext.Provider&gt;\n  )\n}\n\nexport function useTheme() {\n  const context = useContext(ThemeContext)\n  if (context === undefined) {\n    throw new Error('useTheme must be used within a ThemeProvider')\n  }\n  return context\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ app\/layout.tsx\uff08\u30eb\u30fc\u30c8\u30ec\u30a4\u30a2\u30a6\u30c8\uff09\nimport { ThemeProvider } from '@\/contexts\/ThemeContext'\n\nexport default function RootLayout({\n  children,\n}: {\n  children: React.ReactNode\n}) {\n  return (\n    &lt;html&gt;\n      &lt;body&gt;\n        &lt;ThemeProvider&gt;\n          {children}\n        &lt;\/ThemeProvider&gt;\n      &lt;\/body&gt;\n    &lt;\/html&gt;\n  )\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ components\/ThemeToggle.tsx\uff08\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09\n'use client'\n\nimport { useTheme } from '@\/contexts\/ThemeContext'\n\nfunction ThemeToggle() {\n  const { theme, toggleTheme } = useTheme()\n\n  return (\n    &lt;button onClick={toggleTheme}&gt;\n      {theme === 'light' ? '\ud83c\udf19 \u30c0\u30fc\u30af\u30e2\u30fc\u30c9' : '\u2600\ufe0f \u30e9\u30a4\u30c8\u30e2\u30fc\u30c9'}\n    &lt;\/button&gt;\n  )\n}\n\nexport default ThemeToggle<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Context API \u3092\u4f7f\u3046\u969b\u306e\u6ce8\u610f\u70b9\u3067\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Provider \u306f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/strong>\uff1aThemeProvider \u306f &#8216;use client&#8217; \u3092\u4f7f\u3063\u305f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/li>\n<li><strong>\u30eb\u30fc\u30c8\u30ec\u30a4\u30a2\u30a6\u30c8\u306b\u914d\u7f6e<\/strong>\uff1a\u30a2\u30d7\u30ea\u5168\u4f53\u3067\u4f7f\u7528\u3067\u304d\u308b\u3088\u3046\u3001\u30eb\u30fc\u30c8\u30ec\u30a4\u30a2\u30a6\u30c8\u306b\u914d\u7f6e\u3059\u308b<\/li>\n<li><strong>children \u306f\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u3082\u53ef<\/strong>\uff1aProvider \u306e\u5b50\u8981\u7d20\u306b\u306f\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3082\u914d\u7f6e\u3067\u304d\u308b<\/li>\n<li><strong>useContext \u306f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u307f<\/strong>\uff1auseTheme \u30d5\u30c3\u30af\u306f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5185\u3067\u306e\u307f\u4f7f\u7528\u53ef\u80fd<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f37\uff1aZustand \u3092\u4f7f\u3063\u305f\u72b6\u614b\u7ba1\u7406<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u3088\u308a\u8907\u96d1\u306a\u72b6\u614b\u7ba1\u7406\u306b\u306f\u3001Zustand \u306e\u3088\u3046\u306a\u8efd\u91cf\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u4fbf\u5229\u3067\u3059\u3002Provider \u306e\u8a2d\u5b9a\u304c\u4e0d\u8981\u3067\u3001\u30b7\u30f3\u30d7\u30eb\u306a API \u304c\u7279\u5fb4\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ stores\/useCartStore.ts\nimport { create } from 'zustand'\n\ntype CartItem = {\n  id: string\n  name: string\n  price: number\n  quantity: number\n}\n\ntype CartStore = {\n  items: CartItem[]\n  addItem: (item: Omit&lt;CartItem, 'quantity'&gt;) =&gt; void\n  removeItem: (id: string) =&gt; void\n  updateQuantity: (id: string, quantity: number) =&gt; void\n  clearCart: () =&gt; void\n  total: number\n}\n\nexport const useCartStore = create&lt;CartStore&gt;((set, get) =&gt; ({\n  items: [],\n\n  addItem: (item) =&gt;\n    set((state) =&gt; {\n      const existingItem = state.items.find((i) =&gt; i.id === item.id)\n\n      if (existingItem) {\n        return {\n          items: state.items.map((i) =&gt;\n            i.id === item.id ? { ...i, quantity: i.quantity + 1 } : i\n          ),\n        }\n      }\n\n      return {\n        items: [...state.items, { ...item, quantity: 1 }],\n      }\n    }),\n\n  removeItem: (id) =&gt;\n    set((state) =&gt; ({\n      items: state.items.filter((item) =&gt; item.id !== id),\n    })),\n\n  updateQuantity: (id, quantity) =&gt;\n    set((state) =&gt; ({\n      items: state.items.map((item) =&gt;\n        item.id === id ? { ...item, quantity } : item\n      ),\n    })),\n\n  clearCart: () =&gt; set({ items: [] }),\n\n  get total() {\n    return get().items.reduce(\n      (sum, item) =&gt; sum + item.price * item.quantity,\n      0\n    )\n  },\n}))<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ components\/Cart.tsx\uff08\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09\n'use client'\n\nimport { useCartStore } from '@\/stores\/useCartStore'\n\nfunction Cart() {\n  const { items, removeItem, updateQuantity, total } = useCartStore()\n\n  return (\n    &lt;div&gt;\n      &lt;h2&gt;\u30b7\u30e7\u30c3\u30d4\u30f3\u30b0\u30ab\u30fc\u30c8&lt;\/h2&gt;\n\n      {items.length === 0 ? (\n        &lt;p&gt;\u30ab\u30fc\u30c8\u306f\u7a7a\u3067\u3059&lt;\/p&gt;\n      ) : (\n        &lt;&gt;\n          &lt;ul&gt;\n            {items.map((item) =&gt; (\n              &lt;li key={item.id}&gt;\n                &lt;h3&gt;{item.name}&lt;\/h3&gt;\n                &lt;p&gt;\u00a5{item.price.toLocaleString()}&lt;\/p&gt;\n\n                &lt;input\n                  type=\"number\"\n                  value={item.quantity}\n                  onChange={(e) =&gt;\n                    updateQuantity(item.id, parseInt(e.target.value))\n                  }\n                  min=\"1\"\n                \/&gt;\n\n                &lt;button onClick={() =&gt; removeItem(item.id)}&gt;\n                  \u524a\u9664\n                &lt;\/button&gt;\n              &lt;\/li&gt;\n            ))}\n          &lt;\/ul&gt;\n\n          &lt;div&gt;\n            &lt;strong&gt;\u5408\u8a08: \u00a5{total.toLocaleString()}&lt;\/strong&gt;\n          &lt;\/div&gt;\n        &lt;\/&gt;\n      )}\n    &lt;\/div&gt;\n  )\n}\n\nexport default Cart<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Zustand \u306e\u30e1\u30ea\u30c3\u30c8\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u30b7\u30f3\u30d7\u30eb\u306a API<\/strong>\uff1aProvider \u306e\u8a2d\u5b9a\u304c\u4e0d\u8981\u3067\u3001\u30d5\u30c3\u30af\u3092\u76f4\u63a5\u4f7f\u3048\u308b<\/li>\n<li><strong>TypeScript \u5b8c\u5168\u5bfe\u5fdc<\/strong>\uff1a\u578b\u5b89\u5168\u306a\u72b6\u614b\u7ba1\u7406\u304c\u53ef\u80fd<\/li>\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/strong>\uff1a\u5fc5\u8981\u306a\u90e8\u5206\u3060\u3051\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u308b<\/li>\n<li><strong>DevTools \u5bfe\u5fdc<\/strong>\uff1a\u30c7\u30d0\u30c3\u30b0\u304c\u5bb9\u6613<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u305f\u3060\u3057\u3001Zustand \u3082\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5c02\u7528\u3067\u3042\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u30c7\u30fc\u30bf\u30d5\u30a7\u30c3\u30c1\u30f3\u30b0\u306e\u6700\u9069\u5316<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">\u4e26\u5217\u30c7\u30fc\u30bf\u30d5\u30a7\u30c3\u30c1\u30f3\u30b0<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u274c \u60aa\u3044\u4f8b\uff1a\u76f4\u5217\u3067\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\nasync function BadExample() {\n  const user = await fetchUser()\n  const posts = await fetchPosts() \/\/ user\u306e\u53d6\u5f97\u3092\u5f85\u3063\u3066\u304b\u3089\u5b9f\u884c\n  const comments = await fetchComments() \/\/ posts\u306e\u53d6\u5f97\u3092\u5f85\u3063\u3066\u304b\u3089\u5b9f\u884c\n\n  return &lt;div&gt;...&lt;\/div&gt;\n}\n\n\/\/ \u2705 \u826f\u3044\u4f8b\uff1a\u4e26\u5217\u3067\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\nasync function GoodExample() {\n  const [user, posts, comments] = await Promise.all([\n    fetchUser(),\n    fetchPosts(),\n    fetchComments()\n  ])\n\n  return &lt;div&gt;...&lt;\/div&gt;\n}<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6d3b\u7528<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ Next.js 13\u4ee5\u964d\u306efetch API\u306f\u81ea\u52d5\u7684\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u308b\nasync function fetchData() {\n  const res = await fetch('https:\/\/api.example.com\/data', {\n    \/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u52d5\u4f5c\u3092\u6307\u5b9a\n    next: { revalidate: 3600 } \/\/ 1\u6642\u9593\u3054\u3068\u306b\u518d\u691c\u8a3c\n  })\n  return res.json()\n}\n\n\/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u7121\u52b9\u306b\u3059\u308b\u5834\u5408\nasync function fetchFreshData() {\n  const res = await fetch('https:\/\/api.example.com\/data', {\n    cache: 'no-store' \/\/ \u5e38\u306b\u6700\u65b0\u306e\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\n  })\n  return res.json()\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5206\u5272\u306e\u6700\u9069\u5316<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u3067\u304d\u308b\u3060\u3051\u591a\u304f\u306e\u90e8\u5206\u3092\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068\u3057\u3066\u4fdd\u3061\u3001\u5fc5\u8981\u6700\u5c0f\u9650\u306e\u90e8\u5206\u3060\u3051\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5316\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u274c \u60aa\u3044\u4f8b\uff1a\u30da\u30fc\u30b8\u5168\u4f53\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5316\n'use client'\n\nexport default function Page() {\n  const [count, setCount] = useState(0)\n\n  return (\n    &lt;div&gt;\n      &lt;Header \/&gt; {\/* \u9759\u7684\u306a\u306e\u306b\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u306a\u308b *\/}\n      &lt;Article \/&gt; {\/* \u9759\u7684\u306a\u306e\u306b\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u306a\u308b *\/}\n      &lt;button onClick={() =&gt; setCount(count + 1)}&gt;{count}&lt;\/button&gt;\n      &lt;Footer \/&gt; {\/* \u9759\u7684\u306a\u306e\u306b\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u306a\u308b *\/}\n    &lt;\/div&gt;\n  )\n}\n\n\/\/ \u2705 \u826f\u3044\u4f8b\uff1a\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6\u306a\u90e8\u5206\u3060\u3051\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5316\n\/\/ page.tsx\uff08\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09\nexport default function Page() {\n  return (\n    &lt;div&gt;\n      &lt;Header \/&gt; {\/* \u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8 *\/}\n      &lt;Article \/&gt; {\/* \u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8 *\/}\n      &lt;Counter \/&gt; {\/* \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8 *\/}\n      &lt;Footer \/&gt; {\/* \u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8 *\/}\n    &lt;\/div&gt;\n  )\n}\n\n\/\/ Counter.tsx\uff08\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09\n'use client'\n\nexport default function Counter() {\n  const [count, setCount] = useState(0)\n  return &lt;button onClick={() =&gt; setCount(count + 1)}&gt;{count}&lt;\/button&gt;\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3. Suspense \u3068\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u306e\u6d3b\u7528<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Suspense \u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u30c7\u30fc\u30bf\u306e\u8aad\u307f\u8fbc\u307f\u4e2d\u3082\u30da\u30fc\u30b8\u306e\u4e00\u90e8\u3092\u5148\u306b\u8868\u793a\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ app\/dashboard\/page.tsx\nimport { Suspense } from 'react'\nimport UserProfile from '@\/components\/UserProfile'\nimport RecentActivity from '@\/components\/RecentActivity'\nimport Statistics from '@\/components\/Statistics'\n\nexport default function Dashboard() {\n  return (\n    &lt;div&gt;\n      {\/* \u9ad8\u901f\u306b\u8868\u793a\u3067\u304d\u308b\u90e8\u5206 *\/}\n      &lt;h1&gt;\u30c0\u30c3\u30b7\u30e5\u30dc\u30fc\u30c9&lt;\/h1&gt;\n\n      {\/* \u5404\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u500b\u5225\u306bSuspense\u3067\u56f2\u3080 *\/}\n      &lt;Suspense fallback={&lt;UserProfileSkeleton \/&gt;}&gt;\n        &lt;UserProfile \/&gt;\n      &lt;\/Suspense&gt;\n\n      &lt;Suspense fallback={&lt;ActivitySkeleton \/&gt;}&gt;\n        &lt;RecentActivity \/&gt;\n      &lt;\/Suspense&gt;\n\n      &lt;Suspense fallback={&lt;StatisticsSkeleton \/&gt;}&gt;\n        &lt;Statistics \/&gt;\n      &lt;\/Suspense&gt;\n    &lt;\/div&gt;\n  )\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u65b9\u6cd5\u306b\u3088\u308a\u3001<strong>\u5404\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u72ec\u7acb\u3057\u3066\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u3055\u308c\u3001\u30e6\u30fc\u30b6\u30fc\u306f\u5f85\u3061\u6642\u9593\u3092\u611f\u3058\u306b\u304f\u304f\u306a\u308a\u307e\u3059<\/strong>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5b9f\u8df5\u7684\u306a\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u8a2d\u8a08<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u63a8\u5968\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u69cb\u9020<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>src\/\n\u251c\u2500\u2500 app\/                    # App Router\n\u2502   \u251c\u2500\u2500 layout.tsx         # \u30eb\u30fc\u30c8\u30ec\u30a4\u30a2\u30a6\u30c8\n\u2502   \u251c\u2500\u2500 page.tsx           # \u30db\u30fc\u30e0\u30da\u30fc\u30b8\uff08\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09\n\u2502   \u251c\u2500\u2500 dashboard\/\n\u2502   \u2502   \u251c\u2500\u2500 page.tsx       # \u30c0\u30c3\u30b7\u30e5\u30dc\u30fc\u30c9\uff08\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09\n\u2502   \u2502   \u2514\u2500\u2500 loading.tsx    # \u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u72b6\u614b\n\u2502   \u2514\u2500\u2500 actions\/           # Server Actions\n\u2502       \u251c\u2500\u2500 post.ts\n\u2502       \u2514\u2500\u2500 user.ts\n\u251c\u2500\u2500 components\/\n\u2502   \u251c\u2500\u2500 server\/            # \u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5c02\u7528\n\u2502   \u2502   \u251c\u2500\u2500 Header.tsx\n\u2502   \u2502   \u2514\u2500\u2500 Footer.tsx\n\u2502   \u251c\u2500\u2500 client\/            # \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5c02\u7528\n\u2502   \u2502   \u251c\u2500\u2500 Counter.tsx\n\u2502   \u2502   \u2514\u2500\u2500 Form.tsx\n\u2502   \u2514\u2500\u2500 shared\/            # \u4e21\u65b9\u3067\u4f7f\u3048\u308b\n\u2502       \u2514\u2500\u2500 Button.tsx\n\u251c\u2500\u2500 lib\/\n\u2502   \u251c\u2500\u2500 database.ts        # \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u63a5\u7d9a\n\u2502   \u2514\u2500\u2500 utils.ts           # \u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u95a2\u6570\n\u2514\u2500\u2500 stores\/                # \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\u72b6\u614b\u7ba1\u7406\n    \u2514\u2500\u2500 useCartStore.ts<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u8a2d\u8a08\u539f\u5247<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30c7\u30d5\u30a9\u30eb\u30c8\u306f\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/strong>\uff1a\u7279\u5225\u306a\u7406\u7531\u304c\u306a\u3044\u9650\u308a\u3001\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068\u3057\u3066\u5b9f\u88c5\u3059\u308b<\/li>\n<li><strong>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u6700\u5c0f\u9650<\/strong>\uff1a\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6\u306a\u6a5f\u80fd\u304c\u5fc5\u8981\u306a\u90e8\u5206\u306e\u307f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5316\u3059\u308b<\/li>\n<li><strong>\u30c7\u30fc\u30bf\u53d6\u5f97\u306f\u30b5\u30fc\u30d0\u30fc\u3067<\/strong>\uff1aDB \u3084 API \u3078\u306e\u30a2\u30af\u30bb\u30b9\u306f\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u884c\u3046<\/li>\n<li><strong>Server Actions \u3067\u30c7\u30fc\u30bf\u5909\u66f4<\/strong>\uff1a\u4f5c\u6210\u30fb\u66f4\u65b0\u30fb\u524a\u9664\u306f Server Actions \u3092\u4f7f\u7528\u3059\u308b<\/li>\n<li><strong>\u72b6\u614b\u306f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3067<\/strong>\uff1a\u30e6\u30fc\u30b6\u30fc\u64cd\u4f5c\u306b\u5fdc\u3058\u305f\u4e00\u6642\u7684\u306a\u72b6\u614b\u306f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u7ba1\u7406\u3059\u308b<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u3088\u304f\u3042\u308b\u30c8\u30e9\u30d6\u30eb\u3068\u89e3\u6c7a\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u30c8\u30e9\u30d6\u30eb1\uff1a\u300cuseState can only be used in Client Components\u300d\u30a8\u30e9\u30fc<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u539f\u56e0<\/strong>\uff1a\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067 useState \u7b49\u306e React Hooks \u3092\u4f7f\u7528\u3057\u3088\u3046\u3068\u3057\u3066\u3044\u308b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u89e3\u6c7a\u6cd5<\/strong>\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u30d5\u30a1\u30a4\u30eb\u306e\u5148\u982d\u306b &#8216;use client&#8217; \u3092\u8ffd\u52a0\u3059\u308b<\/li>\n<li>\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6\u306a\u90e8\u5206\u3092\u5225\u306e\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068\u3057\u3066\u5207\u308a\u51fa\u3059<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">\u30c8\u30e9\u30d6\u30eb2\uff1a\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304b\u3089\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u95a2\u6570\u3092\u6e21\u305b\u306a\u3044<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u539f\u56e0<\/strong>\uff1a\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u5b9a\u7fa9\u3057\u305f\u95a2\u6570\u3092 props \u3068\u3057\u3066\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u6e21\u305d\u3046\u3068\u3057\u3066\u3044\u308b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u89e3\u6c7a\u6cd5<\/strong>\uff1aServer Actions \u3092\u4f7f\u7528\u3059\u308b\u304b\u3001\u95a2\u6570\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5185\u3067\u5b9a\u7fa9\u3059\u308b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u274c \u60aa\u3044\u4f8b\n\/\/ page.tsx\uff08\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09\nexport default function Page() {\n  const handleClick = () =&gt; {\n    console.log('clicked')\n  }\n\n  return &lt;ClientButton onClick={handleClick} \/&gt; \/\/ \u30a8\u30e9\u30fc\n}\n\n\/\/ \u2705 \u826f\u3044\u4f8b\uff1aServer Actions\u3092\u4f7f\u7528\n\/\/ page.tsx\uff08\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09\nimport { myAction } from '@\/app\/actions'\nimport ClientButton from '@\/components\/ClientButton'\n\nexport default function Page() {\n  return &lt;ClientButton action={myAction} \/&gt;\n}\n\n\/\/ ClientButton.tsx\n'use client'\n\nexport default function ClientButton({ action }: { action: () =&gt; Promise&lt;void&gt; }) {\n  return &lt;button onClick={() =&gt; action()}&gt;\u30af\u30ea\u30c3\u30af&lt;\/button&gt;\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u30c8\u30e9\u30d6\u30eb3\uff1a\u30c7\u30fc\u30bf\u304c\u66f4\u65b0\u3055\u308c\u306a\u3044<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u539f\u56e0<\/strong>\uff1aNext.js \u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u539f\u56e0\u3067\u30c7\u30fc\u30bf\u304c\u66f4\u65b0\u3055\u308c\u306a\u3044<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u89e3\u6c7a\u6cd5<\/strong>\uff1arevalidatePath \u3084 revalidateTag \u3092\u4f7f\u3063\u3066\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u7121\u52b9\u5316\u3059\u308b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ Server Action\u5185\u3067\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u7121\u52b9\u5316\n'use server'\n\nimport { revalidatePath, revalidateTag } from 'next\/cache'\n\nexport async function updatePost(id: string, data: PostData) {\n  await db.post.update({ where: { id }, data })\n\n  \/\/ \u7279\u5b9a\u306e\u30d1\u30b9\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u7121\u52b9\u5316\n  revalidatePath('\/posts')\n  revalidatePath(`\/posts\/${id}`)\n\n  \/\/ \u307e\u305f\u306f\u3001\u30bf\u30b0\u3092\u4f7f\u3063\u3066\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u7121\u52b9\u5316\n  revalidateTag('posts')\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.48.08.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u4f7f\u3044\u5206\u3051\u3001\u3060\u3093\u3060\u3093\u308f\u304b\u3063\u3066\u304d\u307e\u3057\u305f\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.11.23.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u305d\u306e\u8abf\u5b50\u3058\u3083\uff01\u8981\u306f\u300c\u30c7\u30fc\u30bf\u306e\u53d6\u5f97\u306f\u30b5\u30fc\u30d0\u30fc\u3001\u30e6\u30fc\u30b6\u30fc\u64cd\u4f5c\u3078\u306e\u53cd\u5fdc\u306f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u300d\u3068\u899a\u3048\u3066\u304a\u3051\u3070\u826f\u3044\u3093\u3058\u3083\u3088<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067 useEffect \u3092\u4f7f\u3046\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3044\u3044\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">useEffect \u306f\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u4f7f\u7528\u3067\u304d\u307e\u305b\u3093\u3002\u526f\u4f5c\u7528\u51e6\u7406\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001\u305d\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff08&#8217;use client&#8217;\uff09\u306b\u5909\u66f4\u3059\u308b\u304b\u3001\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6\u306a\u90e8\u5206\u306e\u307f\u3092\u5207\u308a\u51fa\u3057\u305f\u5b50\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u4f5c\u6210\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30b5\u30fc\u30d0\u30fc\u5074\u3067\u306e\u521d\u671f\u5316\u51e6\u7406\u306f async \u95a2\u6570\u3068\u3057\u3066\u76f4\u63a5\u8a18\u8ff0\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Server Actions \u3068 API Routes \u306f\u3069\u3046\u4f7f\u3044\u5206\u3051\u307e\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Next.js \u30a2\u30d7\u30ea\u5185\u306e\u64cd\u4f5c\u306b\u306f Server Actions \u3092\u4f7f\u3046\u306e\u304c\u73fe\u5728\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3067\u3059\u3002API Routes \u306f\u5916\u90e8\u30b5\u30fc\u30d3\u30b9\u3084\u5225\u30c9\u30e1\u30a4\u30f3\u306e\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u30a2\u30af\u30bb\u30b9\u3055\u308c\u308b\u5834\u5408\u3001\u307e\u305f\u306f WebSocket\u30fbSSE \u3092\u4f7f\u3046\u30b1\u30fc\u30b9\u3067\u5f15\u304d\u7d9a\u304d\u6709\u52b9\u3067\u3059\u3002App Router \u5c02\u7528\u306e\u30a2\u30d7\u30ea\u3067\u3042\u308c\u3070\u3001\u57fa\u672c\u7684\u306b Server Actions \u3067\u5b8c\u7d50\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Zustand \u306e\u72b6\u614b\u3092\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304b\u3089\u521d\u671f\u5316\u3067\u304d\u307e\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u76f4\u63a5\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u30b5\u30fc\u30d0\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u53d6\u5f97\u3057\u305f\u30c7\u30fc\u30bf\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b props \u3068\u3057\u3066\u6e21\u3057\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u521d\u671f\u5316\u51e6\u7406\uff08useEffect \u3084 initialState\uff09\u3067 Zustand \u30b9\u30c8\u30a2\u306b\u30bb\u30c3\u30c8\u3059\u308b\u65b9\u6cd5\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">useOptimistic \u306f React \u4f55\u30d0\u30fc\u30b8\u30e7\u30f3\u4ee5\u964d\u3067\u4f7f\u3048\u307e\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">useOptimistic \u306f React 19 \u3067\u5b89\u5b9a\u7248\u3068\u3057\u3066\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u3002Next.js 15 \u4ee5\u964d\u3067\u306f\u6a19\u6e96\u3067\u4f7f\u7528\u53ef\u80fd\u3067\u3059\u3002React 18 \u3067\u306f\u5b9f\u9a13\u7684\u30d5\u30e9\u30b0\u304c\u5fc5\u8981\u306a\u305f\u3081\u3001\u672c\u756a\u74b0\u5883\u3067\u306f Next.js \u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Context API \u3068 Zustand \u306f\u3069\u3061\u3089\u3092\u9078\u3076\u3079\u304d\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30c6\u30fc\u30de\u30fb\u30ed\u30b1\u30fc\u30eb\u30fb\u8a8d\u8a3c\u60c5\u5831\u306a\u3069\u66f4\u65b0\u983b\u5ea6\u304c\u4f4e\u3044\u30b0\u30ed\u30fc\u30d0\u30eb\u8a2d\u5b9a\u306b\u306f Context API \u304c\u9069\u3057\u3066\u3044\u307e\u3059\u3002\u30ab\u30fc\u30c8\u3084\u8907\u96d1\u306a UI 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