{"id":9932,"date":"2025-10-23T18:54:47","date_gmt":"2025-10-23T09:54:47","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=9932"},"modified":"2025-11-27T17:48:33","modified_gmt":"2025-11-27T08:48:33","slug":"javascript-const","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/javascript-const\/","title":{"rendered":"\u3010JavaScript\u5165\u9580\u3011const\u3067\u5b9a\u6570\u3092\u5ba3\u8a00\u3059\u308b\uff01let\u3084var\u3068\u306e\u9055\u3044\u3082\u8a73\u3057\u304f\u89e3\u8aac"},"content":{"rendered":"\n<p>JavaScript\u3067\u306f\u3001\u5909\u6570\u306e\u5ba3\u8a00\u6642\u306b\u4f7f\u7528\u3067\u304d\u308b\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u3044\u304f\u3064\u304b\u5b58\u5728\u3057\u307e\u3059\u3002<br>\u305d\u306e\u3046\u3061\u306e\uff11\u3064\u304c\u3001const\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4eca\u56de\u306f\u3001const\u3092\u4f7f\u3063\u3066\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3001\u8a73\u3057\u304f\u89e3\u8aac\u3092\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__1\" class=\"wp-block-heading\">javascript\u306econst\u3068\u306f\uff1f<\/h2>\n\n\n\n<p>const\u306f\u3001JavaScript\u3067\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b\u969b\u306b\u4f7f\u7528\u3059\u308b\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u3046\u3061\u306e\uff11\u3064\u3067\u3059\u3002<\/p>\n\n\n\n<p>JavaScript\u306b\u306f\u3001\u5909\u6570\u306e\u5ba3\u8a00\u6642\u306b\u4f7f\u7528\u53ef\u80fd\u306a\u4ee5\u4e0b\u306e\uff13\u3064\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u5b58\u5728\u3057\u307e\u3059\u3002<br>\u4f7f\u7528\u3059\u308b\u30ad\u30fc\u30ef\u30fc\u30c9\u306b\u3088\u3063\u3066\u3001\u5909\u6570\u306e\u518d\u5ba3\u8a00\u3084\u518d\u4ee3\u5165\u306e\u53ef\u5426\u3068\u3001\u30b9\u30b3\u30fc\u30d7 (\u5909\u6570\u306e\u53c2\u7167\u7bc4\u56f2) \u304c\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>var \u2026 \u518d\u5ba3\u8a00\u30fb\u518d\u4ee3\u5165\u53ef\u80fd\u3001\u95a2\u6570\u30b9\u30b3\u30fc\u30d7<\/li>\n\n\n\n<li>let \u2026 \u518d\u5ba3\u8a00\u4e0d\u53ef\u3001\u518d\u4ee3\u5165\u53ef\u80fd\u3001\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7<\/li>\n\n\n\n<li>const \u2026 \u518d\u5ba3\u8a00\u30fb\u518d\u4ee3\u5165\u4e0d\u53ef\u3001\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7<\/li>\n<\/ul>\n\n\n\n<p>\u518d\u5ba3\u8a00\u3068\u518d\u4ee3\u5165\u306e\u3069\u3061\u3089\u3082\u4e0d\u53ef\u3068\u3059\u308b\u305f\u3081\u3001\u4f7f\u7528\u53ef\u80fd\u306a\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u4e2d\u3067\u6700\u3082\u4fdd\u5b88\u6027\u304c\u9ad8\u3044\u306e\u304cconst\u306e\u7279\u5fb4\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u4e0a\u8a18\u306e\u7279\u5fb4\u304b\u3089\u3001\u4ed6\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306b\u304a\u3051\u308b\u5b9a\u6570\u306b\u8fd1\u3044\u5f62\u3067\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\uff08JavaScript\u306econst\u306f\u914d\u5217\u306a\u3069\u306e\u4e2d\u8eab\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u305f\u3081\u3001\u53b3\u5bc6\u306b\u306f\u5b9a\u6570\u3068\u306f\u7570\u306a\u308a\u307e\u3059\uff09<\/p>\n\n\n\n<h2 id=\"outline__2\" class=\"wp-block-heading\">const\u3067\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b<\/h2>\n\n\n\n<p>const\u3092\u4f7f\u7528\u3057\u3066\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 id=\"outline__2_1\" class=\"wp-block-heading\">\u57fa\u672c\u69cb\u6587<\/h3>\n\n\n\n<p>\u307e\u305a\u306f\u57fa\u672c\u69cb\u6587\u304b\u3089\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<br>const\u3092\u4f7f\u7528\u3057\u3066\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b\u969b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30b3\u30fc\u30c9\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const \u5909\u6570\u540d = \u5024;<\/code><\/pre><\/div>\n\n\n\n<p>const\u3067\u5ba3\u8a00\u3057\u305f\u5909\u6570\u306f\u5024\u306e\u518d\u4ee3\u5165\u304c\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u5ba3\u8a00\u6642\u306b\u5fc5\u305a\u5024\u3092\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__2_2\" class=\"wp-block-heading\">const\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>\u3010\u7df4\u7fd2\u3011<\/p>\n\n\n\n<p>\u4e0b\u306e\u67a0\u3067const\u3092\u4f7f\u7528\u3057\u305f\u969b\u306e\u5b9f\u969b\u306e\u52d5\u304d\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br>\u76f4\u5f84100\u306e\u5186\u306e\u5186\u5468\u3092\u6c42\u3081\u308b\u95a2\u6570\u3092\u4f5c\u6210\u3057\u3001\u5b9f\u884c\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br>\u203b\u7d9a\u3051\u3066\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<iframe loading=\"lazy\" src=\"https:\/\/paiza.io\/projects\/e\/sPVaxlxABukbEVq98KYDtw?theme=twilight\" width=\"100%\" height=\"500\"><\/iframe>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const Pi = 3.14\n\nfunction circumference(diameter){\n    return diameter * Pi\n}\n\nconsole.log(circumference(100));<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>314<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001\u4efb\u610f\u306e\u5024\u3067\u5186\u5468\u3092\u6c42\u3081\u308b\u95a2\u6570\u3092\u4f5c\u6210\u3057\u3001\u305d\u306e\u5b9f\u884c\u7d50\u679c\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u8868\u793a\u3057\u3066\u3044\u307e\u3059\u3002<br>\u8a08\u7b97\u3092\u884c\u3046\u4e0a\u3067\u5fc5\u8981\u306a\uff12\u3064\u306e\u5024\u306e\u3046\u3061\u3001\u5186\u5468\u7387\u306f\u6570\u5024\u304c\u56fa\u5b9a\u3068\u306a\u308b\u305f\u3081\u3001const\u3092\u4f7f\u3063\u3066\u5f8c\u304b\u3089\u5909\u66f4\u3055\u308c\u308b\u3053\u3068\u304c\u306a\u3044\u3088\u3046\u306b\u5ba3\u8a00\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5b9f\u969b\u306b\u3001const\u3067\u5ba3\u8a00\u3057\u305f\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306e\u5909\u6570\u306b\u518d\u4ee3\u5165\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const Pi = 3.14\n\nPi = 3;<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>TypeError: Assignment to constant variable.<\/code><\/pre><\/div>\n\n\n\n<p>\u8a18\u8ff0\u30df\u30b9\u306a\u3069\u306b\u3088\u3063\u3066\u5fc5\u8981\u306e\u306a\u3044\u5909\u66f4\u3092\u52a0\u3048\u3089\u308c\u3066\u3057\u307e\u3046\u30ea\u30b9\u30af\u304c\u4e0b\u304c\u308b\u305f\u3081\u3001\u57fa\u672c\u7684\u306b\u306f const\u3067\u5ba3\u8a00\u3059\u308b\u3053\u3068\u3092\u30aa\u30b9\u30b9\u30e1\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u306a\u304a\u3001\u914d\u5217\u306a\u3069\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u578b\u306e\u5834\u5408\u306f\u3001\u53c2\u7167\u306e\u95a2\u4fc2\u306b\u3088\u308a\u8981\u7d20\u306e\u5024\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u306f\u53ef\u80fd\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<br>\u305f\u3060\u3057\u3001\u5225\u306e\u914d\u5217\u3067\u4e0a\u66f8\u304d\u3059\u308b\u3068\u3044\u3063\u305f\u3088\u3046\u306a\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u305d\u306e\u3082\u306e\u3092\u518d\u4ee3\u5165\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const sampleArray = [1, 2, 3];\n\n\/\/ \u8981\u7d20\u306e\u5024\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u306f\u53ef\u80fd\nsampleArray[0] = 3;\n\n\/\/ \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5358\u4f4d\u3067\u306e\u518d\u4ee3\u5165\u306f\u4e0d\u53ef\nsampleArray = [3, 2, 3];<\/code><\/pre><\/div>\n\n\n\n<h2 id=\"outline__3\" class=\"wp-block-heading\">\u4ed6\u306e\u5909\u6570\u5ba3\u8a00\u306e\u65b9\u6cd5\u3068const\u3068\u306e\u9055\u3044<\/h2>\n\n\n\n<p>\u5909\u6570\u5ba3\u8a00\u306b\u4f7f\u7528\u3067\u304d\u308b\u30ad\u30fc\u30ef\u30fc\u30c9\u306fconst\u3092\u542b\u3081\u3066\u5168\u90e8\u3067\uff13\u3064\u3042\u308b\u3068\u5192\u982d\u3067\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<br>\u3053\u306e\u3046\u3061\u3001let\u3068var\u306e\u305d\u308c\u305e\u308c\u306b\u3064\u3044\u3066\u3001const\u3068\u306e\u9055\u3044\u3092\u5177\u4f53\u7684\u306b\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 id=\"outline__3_1\" class=\"wp-block-heading\">let\u3067\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b<\/h3>\n\n\n\n<p>let\u3067\u5909\u6570\u3092\u5ba3\u8a00\u3057\u305f\u5834\u5408\u3068\u3001const\u3067\u5909\u6570\u3092\u5ba3\u8a00\u3057\u305f\u5834\u5408\u306e\u9055\u3044\u306f\u3001\u518d\u4ee3\u5165\u304b\u53ef\u80fd\u3067\u3042\u308b\u304b\u5426\u304b\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>let\u3068 const\u306f\u3069\u3061\u3089\u3082\u518d\u5ba3\u8a00\u4e0d\u53ef\u3001\u304b\u3064\u5909\u6570\u306e\u30b9\u30b3\u30fc\u30d7\u304c\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7\u3068\u306a\u308b\u30ad\u30fc\u30ef\u30fc\u30c9\u3067\u3059\u3002<br>\u305d\u306e\u305f\u3081\u3001\u4f7f\u3044\u5206\u3051\u3092\u884c\u3046\u969b\u306f\u3001\u518d\u4ee3\u5165\u3092\u53ef\u80fd\u3068\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u306b\u6761\u4ef6\u3092\u7d5e\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>let\u3092\u4f7f\u7528\u3059\u308b\u30b1\u30fc\u30b9\u3067\u7279\u306b\u591a\u3044\u306e\u306f\u3001for\u6587\u306e\u30ab\u30a6\u30f3\u30bf\u30fc\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<br>\u30ab\u30a6\u30f3\u30bf\u30fc\u5909\u6570\u306f\u30eb\u30fc\u30d7\u3054\u3068\u306b\u5024\u304c\u518d\u4ee3\u5165\u3055\u308c\u308b\u305f\u3081\u3001const\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>\u3010\u7df4\u7fd2\u3011<\/p>\n\n\n\n<p>\u4e0b\u306e\u67a0\u306blet\u3067\u5909\u6570\u3092\u5ba3\u8a00\u3057\u3001\u6a2a\u4e26\u3073\u306e\u914d\u5217\u300c1, 2, 3\u300d\u3092\u3001\u7e26\u4e26\u3073\u306e\u914d\u5217\u306b\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br>\u203b\u7d9a\u3051\u3066\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<iframe loading=\"lazy\" src=\"https:\/\/paiza.io\/projects\/e\/vD-OjxDeBR6vIsvinO8PGg?theme=twilight\" width=\"100%\" height=\"500\"><\/iframe>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const sampleArray = [1, 2, 3];\n\n\/\/ const\u306f\u4f7f\u3048\u306a\u3044\u305f\u3081\u3001let\u3092\u4f7f\u7528\u3059\u308b\nfor(let i = 0; i &lt; 3; i++){\n    console.log(sampleArray[i]);\n}<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>1\n2\n3<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8a18\u306e\u3088\u3046\u306a const\u304c\u4f7f\u7528\u3067\u304d\u306a\u3044\u30b1\u30fc\u30b9\u3067\u306f let\u3092\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306f const\u3068\u4f7f\u3044\u5206\u3051\u308b\u3068\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\u306a\u304a\u4f59\u8ac7\u3067\u3059\u304c\u3001for\u2026in\u6587\u3084 for\u2026of\u6587\u306e\u5834\u5408\u306f\u30eb\u30fc\u30d7\u3054\u3068\u306b\u65b0\u305f\u306b\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7\u304c\u4f5c\u3089\u308c\u308b\u305f\u3081\u3001const\u3067\u306e\u5909\u6570\u5ba3\u8a00\u304c\u53ef\u80fd\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const sampleArray = [1, 2, 3];\n\n\/\/ \u3053\u306e\u5834\u5408\u306fconst\u304c\u4f7f\u3048\u308b\nfor(const num of sampleArray){\n    console.log(num);\n}<\/code><\/pre><\/div>\n\n\n\n<h3 id=\"outline__3_2\" class=\"wp-block-heading\">var\u3067\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b<\/h3>\n\n\n\n<p>var\u306f\u3001\uff13\u3064\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u4e2d\u3067\u6700\u3082\u5236\u9650\u304c\u7de9\u3044\u30ad\u30fc\u30ef\u30fc\u30c9\u3068\u306a\u308a\u307e\u3059\u3002<br>\u5909\u6570\u3078\u306e\u518d\u4ee3\u5165\u3060\u3051\u3067\u306a\u304f\u3001const\u3084let\u3067\u306f\u4e0d\u53ef\u80fd\u306a\u5909\u6570\u306e\u518d\u5ba3\u8a00\u3082\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const sampleConst = 0;\n\/\/ \u518d\u5ba3\u8a00\u4e0d\u53ef\u306e\u305f\u3081\u30a8\u30e9\u30fc\u306b\u306a\u308b\nconst sampleConst = 1;\n\nvar sampleVar = 0;\n\/\/ \u518d\u5ba3\u8a00\u3057\u3066\u3082\u30a8\u30e9\u30fc\u306b\u306a\u3089\u306a\u3044\nvar sampleVar = 1;<\/code><\/pre><\/div>\n\n\n\n<p>\u307e\u305f\u3001\u5909\u6570\u306e\u30b9\u30b3\u30fc\u30d7\u304c const\u3084 let\u3068\u306f\u7570\u306a\u308a\u3001\u95a2\u6570\u30b9\u30b3\u30fc\u30d7\u3068\u306a\u3063\u3066\u3044\u308b\u306e\u3082\u7279\u5fb4\u306e\uff11\u3064\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u5909\u6570\u306e\u30b9\u30b3\u30fc\u30d7\u306f\u5927\u307e\u304b\u306b\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u30b9\u30b3\u30fc\u30d7\u3068\u30ed\u30fc\u30ab\u30eb\u30b9\u30b3\u30fc\u30d7\u306e\uff12\u7a2e\u985e\u306b\u5206\u3051\u3089\u308c\u3001\u305d\u306e\u5185\u306e\u30ed\u30fc\u30ab\u30eb\u30b9\u30b3\u30fc\u30d7\u5074\u306b\u5206\u985e\u3055\u308c\u308b\u306e\u304c\u95a2\u6570\u30b9\u30b3\u30fc\u30d7\u3068\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7\u3067\u3059\u3002<br>\u30ed\u30fc\u30ab\u30eb\u30b9\u30b3\u30fc\u30d7\u306f\u3001\u5bfe\u5fdc\u3059\u308b\u30b9\u30b3\u30fc\u30d7\u5185\u3067\u5ba3\u8a00\u3057\u305f\u5909\u6570\u3092\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3068\u3057\u3001\u30b9\u30b3\u30fc\u30d7\u5916\u304b\u3089\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7\u304c\u9069\u7528\u3055\u308c\u308b const\u3068 let\u306f\u3001\u95a2\u6570\u5185\u3067\u5909\u6570\u3092\u5ba3\u8a00\u3057\u305f\u5834\u5408\u3068\u3001if\u6587\u306a\u3069\u306e\u30d6\u30ed\u30c3\u30af\u5185\u3067\u5909\u6570\u3092\u5ba3\u8a00\u3057\u305f\u5834\u5408\u306e\u3069\u3061\u3089\u3082\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3068\u3057\u3066\u6271\u308f\u308c\u308b\u305f\u3081\u3001\u30d6\u30ed\u30c3\u30af\u5916\u3067\u5ba3\u8a00\u3057\u305f\u5909\u6570\u3092\u547c\u3073\u51fa\u305d\u3046\u3068\u3059\u308b\u3068\u30a8\u30e9\u30fc\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const sampleConst = 10;\n\nfor(let i = 0; i &lt; 3; i++){\n    \/\/ \u30d6\u30ed\u30c3\u30af\u5185\u306e\u307f\u6709\u52b9\u306e\u305f\u3081\u3001\u65e2\u5b58\u306e\u5909\u6570\u540d\u3068\u540c\u3058\u540d\u524d\u3067\u5ba3\u8a00\u3067\u304d\u308b\n    const sampleConst = i;\n    const blockVal = i;\n}\n\n\/\/ \u30d6\u30ed\u30c3\u30af\u5185\u3067\u5ba3\u8a00\u3057\u305f\u5909\u6570\u306f\u5916\u3067\u306e\u547c\u3073\u51fa\u3057\u306f\u3067\u304d\u306a\u3044\nconsole.log(blockVal);<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>ReferenceError: blockVal is not defined<\/code><\/pre><\/div>\n\n\n\n<p>\u4e00\u65b9\u3001var\u306f\u95a2\u6570\u30b9\u30b3\u30fc\u30d7\u3067\u3042\u308b\u305f\u3081\u3001\u95a2\u6570\u3067\u306f\u306a\u3044 if\u6587\u306a\u3069\u306e\u30d6\u30ed\u30c3\u30af\u5185\u3067\u5909\u6570\u3092\u5ba3\u8a00\u3057\u305f\u5834\u5408\u3001\u30b9\u30b3\u30fc\u30d7\u306f\u9069\u7528\u3055\u308c\u305a\u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\u3068\u540c\u3058\u6271\u3044\u3068\u306a\u308a\u307e\u3059\u3002<br>\u30d6\u30ed\u30c3\u30af\u5916\u304b\u3089\u3082\u5909\u6570\u306e\u547c\u3073\u51fa\u3057\u304c\u53ef\u80fd\u3067\u3042\u308b\u4ed6\u3001\u65e2\u5b58\u306e\u5909\u6570\u3068\u540c\u540d\u306e\u5909\u6570\u3092\u5ba3\u8a00\u3057\u305f\u5834\u5408\u306f\u518d\u5ba3\u8a00\u3057\u305f\u3082\u306e\u3068\u898b\u306a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>var sampleConst = 10;\n\nfor(let i = 0; i &lt; 3; i++){\n    \/\/ \u65e2\u5b58\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u540c\u540d\u306e\u5834\u5408\u3001\u518d\u5ba3\u8a00\u6271\u3044\u3068\u306a\u308b\n    var sampleConst = i;\n    var blockVal = i;\n}\n\nconsole.log(sampleConst);\n\/\/ \u30d6\u30ed\u30c3\u30af\u5185\u3067\u5ba3\u8a00\u3057\u305f\u5909\u6570\u3082\u547c\u3073\u51fa\u3057\u53ef\u80fd\nconsole.log(blockVal);<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>2\n2<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8a18\u306e\u4ed5\u69d8\u4e0a\u3001var\u306f\u30b3\u30fc\u30c9\u30df\u30b9\u304c\u3042\u3063\u3066\u3082\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u306a\u3044\u5834\u5408\u304c\u307b\u3068\u3093\u3069\u306e\u305f\u3081\u3001\u9593\u9055\u3044\u306b\u6c17\u4ed8\u304b\u306a\u3044\u307e\u307e\u306b\u60f3\u5b9a\u5916\u306e\u52d5\u4f5c\u3092\u5f15\u304d\u8d77\u3053\u3059\u30ea\u30b9\u30af\u304c\u6700\u3082\u9ad8\u3044\u30ad\u30fc\u30ef\u30fc\u30c9\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<br>\u305d\u306e\u305f\u3081\u3001\u5909\u6570\u306e\u5ba3\u8a00\u306f const\u3068 let\u306e\uff12\u3064\u306e\u307f\u3067\u4f7f\u3044\u5206\u3051\u308b\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u3092\u30aa\u30b9\u30b9\u30e1\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__4\" class=\"wp-block-heading\">const\u3068\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u3067\u95a2\u6570\u3092\u5ba3\u8a00\u3059\u308b<\/h2>\n\n\n\n<p>\u5909\u6570\u306b\u306f\u3001\u6570\u5024\u3084\u6587\u5b57\u5217\u306a\u3069\u306e\u5024\u3060\u3051\u3067\u306a\u304f\u3001\u95a2\u6570\u3092\u4ee3\u5165\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<br>\u305d\u306e\u969b\u306b\u4fbf\u5229\u306a\u306e\u304c\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u3068\u306f\u3001\u95a2\u6570\u306e\u8a18\u8ff0\u3092\u7c21\u6f54\u306b\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u8a18\u6cd5\u306e\u3053\u3068\u3092\u8a00\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const sampleFunc = () =&gt; console.log(&quot;Hello World!&quot;);<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u306e\u3046\u3061\u3001\u300c() =&gt; console.log(&#8220;Hello World!&#8221;)\u300d \u3068\u8a18\u8ff0\u3055\u308c\u3066\u3044\u308b\u90e8\u5206\u304c\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u3067\u3059\u3002<br>\u8907\u96d1\u306a\u51e6\u7406\u3092\u884c\u3046\u95a2\u6570\u306e\u8a18\u8ff0\u306b\u306f\u5411\u3044\u3066\u3044\u307e\u305b\u3093\u304c\u3001\u5185\u5bb9\u306b\u5fdc\u3058\u3066\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u7c21\u6f54\u3067\u898b\u3084\u3059\u3044\u30b3\u30fc\u30c9\u306b\u307e\u3068\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305f\u3060\u3057\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001\u30db\u30a4\u30b9\u30c6\u30a3\u30f3\u30b0\uff08\u5dfb\u304d\u4e0a\u3052\uff09\u304c\u884c\u308f\u308c\u306a\u3044\u70b9\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u30db\u30a4\u30b9\u30c6\u30a3\u30f3\u30b0\u3068\u306f\u3001\u5909\u6570\u3084\u95a2\u6570\u304c\u5b9a\u7fa9\u3055\u308c\u308b\u3088\u308a\u524d\u306b\u3001\u30e1\u30e2\u30ea\u306b\u914d\u7f6e\u3055\u308c\u308b\u6319\u52d5\u306e\u3053\u3068\u3092\u8a00\u3044\u307e\u3059\u3002<br>\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b1\u30fc\u30b9\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>sampleFunc();\n\nfunction sampleFunc(){\n    console.log(&quot;Hello World!&quot;);\n}<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>Hello World!<\/code><\/pre><\/div>\n\n\n\n<p>\u95a2\u6570\u306e\u5ba3\u8a00\u3088\u308a\u3082\u5148\u306b\u547c\u3073\u51fa\u3057\u304c\u884c\u308f\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u30db\u30a4\u30b9\u30c6\u30a3\u30f3\u30b0\u306b\u3088\u3063\u3066\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u3053\u3068\u306a\u304f\u5b9f\u884c\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4e00\u65b9\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u306f\u95a2\u6570\u306e\u5ba3\u8a00\u3067\u306f\u306a\u304f\u3001\u5909\u6570\u306b\u4ee3\u5165\u3059\u308b\u5024\u3068\u3057\u3066\u6271\u308f\u308c\u308b\u305f\u3081\u3001\u30db\u30a4\u30b9\u30c6\u30a3\u30f3\u30b0\u306f\u9069\u7528\u3055\u308c\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>console.log(sampleFunc);\n\nconst sampleFunc = () =&gt; &quot;Hello World!&quot;;<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>ReferenceError: Cannot access &#39;sampleFunc&#39; before initialization<\/code><\/pre><\/div>\n\n\n\n<p>\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001\u30b1\u30fc\u30b9\u306b\u3088\u308a\u901a\u5e38\u306e\u95a2\u6570\u5ba3\u8a00\u3068\u6319\u52d5\u304c\u7570\u306a\u308b\u5834\u5408\u304c\u3042\u308b\u70b9\u306b\u6c17\u3092\u4ed8\u3051\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 id=\"outline__5\" class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u4eca\u56de\u306f\u3001const\u3092\u4f7f\u3063\u3066\u5909\u6570\u5ba3\u8a00\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<br>\u4f7f\u3046\u30ad\u30fc\u30ef\u30fc\u30c9\u306b\u3088\u3063\u3066\u5909\u6570\u306e\u6319\u52d5\u304c\u5909\u308f\u308b\u305f\u3081\u3001\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u4e0a\u624b\u304f\u4f7f\u3044\u5206\u3051\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 id=\"outline__6\" class=\"wp-block-heading\">JavaScript\u306e\u52c9\u5f37\u65b9\u6cd5\u306f\uff1f<\/h2>\n\n\n<p>\u66f8\u7c4d\u3084\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3067\u5b66\u7fd2\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002\u6628\u4eca\u3067\u306f\u3001YouTube\u306a\u3069\u306e\u52d5\u753b\u30b5\u30a4\u30c8\u3084\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u30b5\u30a4\u30c8\u306a\u3069\u3082\u5145\u5b9f\u3057\u3066\u3044\u3066\u591a\u304f\u306e\u60c5\u5831\u304c\u624b\u306b\u5165\u308a\u307e\u3059\u3002<br \/>\u305d\u3057\u3066\u3001\u3088\u308a\u52b9\u7387\u7684\u306b\u77e5\u8b58\u30fb\u30b9\u30ad\u30eb\u3092\u7fd2\u5f97\u3059\u308b\u306b\u306f\u3001\u77e5\u8b58\u3092\u3064\u3051\u306a\u304c\u3089\u5b9f\u969b\u306b\u624b\u3092\u52d5\u304b\u3057\u3066\u307f\u308b\u306a\u3069\u3001\u30a4\u30f3\u30d7\u30c3\u30c8\u3068\u30a2\u30a6\u30c8\u30d7\u30c3\u30c8\u3092\u7e70\u308a\u8fd4\u3057\u3066\u3044\u304f\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u7279\u306b\u72ec\u5b66\u306e\u5834\u5408\u306f\u3001\u6709\u8b58\u8005\u306b\u8cea\u554f\u304c\u3067\u304d\u305f\u308a\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u3092\u3082\u3089\u3048\u308b\u3088\u3046\u306a\u74b0\u5883\u304c\u3042\u308b\u3068\u3001\u7406\u89e3\u5ea6\u304c\u6df1\u307e\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u305f\u3060\u3001JavaScript\u306b\u9650\u3089\u305a\u3001IT\u30b9\u30ad\u30eb\u3092\u8eab\u306b\u3064\u3051\u308b\u969b\u3001\u3069\u3046\u3057\u3066\u3082\u8ab2\u984c\u306b\u3076\u3064\u304b\u3063\u3066\u3057\u307e\u3046\u3053\u3068\u306f\u3042\u308a\u307e\u3059\u3088\u306d\u3002\u7279\u306b\u72ec\u5b66\u3060\u3068\u3001\u308f\u304b\u3089\u306a\u3044\u90e8\u5206\u3092\u30d7\u30ed\u306b\u8cea\u554f\u3067\u304d\u308b\u6a5f\u4f1a\u3092\u78ba\u4fdd\u3057\u306b\u304f\u304f\u3001\u30e2\u30c1\u30d9\u30fc\u30b7\u30e7\u30f3\u304c\u7d9a\u304d\u306b\u304f\u3044\u3068\u3044\u3046\u5074\u9762\u304c\u3042\u308a\u307e\u3059\u3002\u72ec\u5b66\u3067\u30e2\u30c1\u30d9\u30fc\u30b7\u30e7\u30f3\u3092\u7dad\u6301\u3059\u308b\u81ea\u4fe1\u304c\u306a\u3044\u4eba\u306b\u306f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u3068\u3044\u3046\u624b\u3082\u3042\u308a\u307e\u3059\u3002\u8cbb\u7528\u306f\u639b\u304b\u308a\u307e\u3059\u304c\u3001\u305d\u306e\u5206\u30b9\u30ad\u30eb\u3092\u8eab\u306b\u3064\u3051\u3084\u3059\u3044\u3067\u3059\u3002\u3057\u3063\u304b\u308a\u3068\u77e5\u8b58\u30fb\u30b9\u30ad\u30eb\u3092\u7fd2\u5f97\u3057\u3066\u5b9f\u8df5\u306b\u6d3b\u304b\u3057\u305f\u3044\u3068\u3044\u3046\u4eba\u306f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002<\/p>\n<p><span class=\"markerYellow\"><strong>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u306a\u3089\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u304c\u304a\u3059\u3059\u3081\uff01<\/strong><\/span><\/p>\n\n\n<img decoding=\"async\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/yuudou.png\" alt=\"\" class=\"post-img\" loading=\"lazy\">\n\n\n<p>IT\u30b9\u30ad\u30eb\u9700\u8981\u306e\u9ad8\u307e\u308a\u3068\u3068\u3082\u306b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u3082\u5897\u3048\u307e\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u3069\u306e\u30b9\u30af\u30fc\u30eb\u306b\u901a\u3046\u3079\u304d\u304b\u8ff7\u3063\u3066\u3057\u307e\u3046\u4eba\u3082\u3044\u308b\u3067\u3057\u3087\u3046\u3002\u305d\u3093\u306a\u65b9\u306b\u306f\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\uff01\u3053\u308c\u307e\u3067\u591a\u304f\u306eIT\u30a8\u30f3\u30b8\u30cb\u30a2\u3092\u80b2\u6210\u30fb\u8f29\u51fa\u3057\u3066\u304d\u305f\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u3067\u3082\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u3092\u958b\u8b1b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<div class=\"bgBox\">\n<p><strong>\uff1c\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u306e\u7279\u5fb4\uff1e<\/strong><br \/><strong>\u30fb\u305f\u3057\u304b\u306a\u80b2\u6210\u5b9f\u7e3e\u3068\u89aa\u8eab\u306a\u6559\u80b2\u3000\uff5e\u30bb\u30ab\u30f3\u30c9\u30ad\u30e3\u30ea\u30a2\u3092\u5168\u529b\u652f\u63f4\uff5e<\/strong><br \/><strong>\u30fb\u8b1b\u5e2b\u304c\u73fe\u5f79\u30a8\u30f3\u30b8\u30cb\u30a2\u3000\uff5e\u201c\u672c\u5f53\u201d\u306e\u958b\u767a\u30ce\u30a6\u30cf\u30a6\u3092\u76f4\u306b\u5b66\u3079\u308b\uff5e<\/strong><br \/><strong>\u30fb\u5c02\u5c5e\u8b1b\u5e2b\u304c\u5b66\u7fd2\u3092\u5fb9\u5e95\u30b5\u30dd\u30fc\u30c8\u3000\uff5e\u300c\u308f\u304b\u3089\u306a\u3044\u300d\u3092\u5fb9\u5e95\u89e3\u6c7a\uff5e<\/strong><br \/><strong>\u30fb\u5b9f\u52d9\u30d9\u30fc\u30b9\u3067\u30b9\u30ad\u30eb\u3092\u7fd2\u5f97\u3000\uff5e\u5b9f\u8df5\u7684\u306a\u51dd\u7e2e\u30ab\u30ea\u30ad\u30e5\u30e9\u30e0\uff5e<\/strong><\/p>\n<\/div>\n<p>\u3053\u306e\u3088\u3046\u306a\u7279\u5fb4\u3092\u6301\u3064\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u306fIT\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u30b9\u30bf\u30fc\u30c8\u30e9\u30a4\u30f3\u3068\u3057\u3066\u6700\u9069\u3067\u3059\u3002<br \/>\u8a71\u3092\u805e\u304d\u305f\u3044\u30fb\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u3068\u3044\u3046\u65b9\u306f<a href=\"https:\/\/techmania.jp\/lp\/2\" target=\"_blank\" rel=\"noopener\">\u3053\u3061\u3089<\/a>\u304b\u3089\u304a\u6c17\u8efd\u306b\u304a\u554f\u3044\u5408\u308f\u305b\u304f\u3060\u3055\u3044\u3002<\/p>","protected":false},"excerpt":{"rendered":"JavaScript\u3067\u306f\u3001\u5909\u6570\u306e\u5ba3\u8a00\u6642\u306b\u4f7f\u7528\u3067\u304d\u308b\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u3044\u304f\u3064\u304b\u5b58\u5728\u3057\u307e\u3059\u3002\u305d\u306e\u3046\u3061\u306e\uff11\u3064\u304c\u3001const\u3067\u3059\u3002 \u4eca\u56de\u306f\u3001const\u3092\u4f7f\u3063\u3066\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3001\u8a73\u3057\u304f\u89e3\u8aac\u3092\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002 javascript\u306econst\u3068\u306f\uff1f const\u306f\u3001JavaScript\u3067\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b\u969b\u306b\u4f7f\u7528\u3059\u308b\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u3046\u3061\u306e\uff11\u3064\u3067\u3059\u3002 JavaScript\u306b\u306f\u3001\u5909\u6570\u306e\u5ba3\u8a00\u6642\u306b\u4f7f\u7528\u53ef\u80fd\u306a\u4ee5\u4e0b\u306e\uff13 [&hellip;]","protected":false},"author":11,"featured_media":9934,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-9932","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-programming"],"_links":{"self":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts\/9932","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/comments?post=9932"}],"version-history":[{"count":4,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts\/9932\/revisions"}],"predecessor-version":[{"id":10077,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts\/9932\/revisions\/10077"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/media\/9934"}],"wp:attachment":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/media?parent=9932"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/categories?post=9932"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/tags?post=9932"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}