{"id":9929,"date":"2025-10-23T18:21:09","date_gmt":"2025-10-23T09:21:09","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=9929"},"modified":"2025-11-27T17:46:47","modified_gmt":"2025-11-27T08:46:47","slug":"javascript-includes","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/javascript-includes\/","title":{"rendered":"\u3010JavaScript\u5165\u9580\u3011includes\u30e1\u30bd\u30c3\u30c9\u3067\u7279\u5b9a\u306e\u6587\u5b57\u5217\u304c\u542b\u307e\u308c\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b"},"content":{"rendered":"\n<p>JavaScript\u3067\u914d\u5217\u3084\u6587\u5b57\u5217\u3092\u6271\u3046\u969b\u306b\u3001\u7279\u5b9a\u306e\u5024\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3057\u305f\u3044\u6642\u304c\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002<br>\u305d\u306e\u969b\u306b\u6d3b\u7528\u3067\u304d\u308b\u306e\u304c\u3001includes\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4eca\u56de\u306e\u8a18\u4e8b\u3067\u306f\u3001includes\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<br>includes\u30e1\u30bd\u30c3\u30c9\u306b\u4f3c\u305f\u50cd\u304d\u3092\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u306e\u52d5\u4f5c\u306b\u3064\u3044\u3066\u3084\u3001\u305d\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u3068 includes\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u5206\u3051\u308b\u30dd\u30a4\u30f3\u30c8\u306b\u3064\u3044\u3066\u3082\u89e3\u8aac\u3059\u308b\u306e\u3067\u3001\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 id=\"outline__1\" class=\"wp-block-heading\">JavaScript\u306eincludes\u30e1\u30bd\u30c3\u30c9\u3068\u306f\uff1f<\/h2>\n\n\n\n<p>includes\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u7279\u5b9a\u306e\u5024\u304c\u914d\u5217\u306e\u8981\u7d20\u3084\u6587\u5b57\u5217\u306b\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u969b\u306b\u4f7f\u7528\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<br>\u5024\u306e\u6709\u7121\u306b\u3088\u3063\u3066\u771f\u507d\u5024\u304c\u8fd4\u3055\u308c\u308b\u305f\u3081\u3001if\u6587\u306e\u6761\u4ef6\u5f0f\u306a\u3069\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__2\" class=\"wp-block-heading\">\u914d\u5217\uff08Array\uff09\u306eincludes\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<p>includes\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u914d\u5217\u306e\u65e2\u5b58\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308b includes\u3068\u3001\u6587\u5b57\u5217 (String) \u306e\u65e2\u5b58\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308b includes\u306e\uff12\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305a\u306f\u3001\u914d\u5217\u306e\u65e2\u5b58\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308b includes\u304b\u3089\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>\u914d\u5217\u306e includes\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u306f\u3001\u4ee5\u4e0b\u306e\u901a\u308a\u3067\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>\u914d\u5217\u540d.includes(\u691c\u7d22\u5024, \u691c\u7d22\u958b\u59cb\u4f4d\u7f6e)<\/code><\/pre><\/div>\n\n\n\n<p>\u30e1\u30bd\u30c3\u30c9\u306e\u7b2c\uff11\u5f15\u6570\u306b\u306f\u3001\u691c\u7d22\u3057\u305f\u3044\u8981\u7d20\u306e\u5024\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<br>\u6307\u5b9a\u3057\u305f\u5024\u304c\u914d\u5217\u5185\u306b\u542b\u307e\u308c\u3066\u3044\u308b\u5834\u5408\u306f true\u3001\u7121\u3044\u5834\u5408\u306f false\u304c\u8fd4\u5374\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u7b2c\uff12\u5f15\u6570\u306b\u306f\u3001\u691c\u7d22\u3092\u958b\u59cb\u3059\u308b\u8981\u7d20\u306e\u4f4d\u7f6e (\u30a4\u30f3\u30c7\u30c3\u30af\u30b9) \u3092\u4efb\u610f\u3067\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002<br>\u6307\u5b9a\u304c\u7121\u3044\u5834\u5408\u306f\uff10\u756a\u76ee\u304b\u3089\u306e\u691c\u7d22\u3068\u306a\u308a\u3001\u30de\u30a4\u30ca\u30b9\u5024\u3092\u6307\u5b9a\u3057\u305f\u5834\u5408\u306f\u672b\u5c3e\u304b\u3089\u9061\u3063\u3066\u6570\u3048\u307e\u3059\u3002<\/p>\n\n\n\n<p>includes\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u969b\u306b\u4f7f\u7528\u3057\u305f\u5834\u5408\u306e\u52d5\u304d\u3092\u3001\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u898b\u3066\u307f\u307e\u3057\u3087\u3046\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 = [&quot;apple&quot;, 10, &quot;orange&quot;, 30];\n\nconsole.log(sampleArray.includes(&quot;apple&quot;));\nconsole.log(sampleArray.includes(20));\n\n\/\/ \u958b\u59cb\u4f4d\u7f6e\u306e\u6307\u5b9a\u306b\u3088\u308a\u7d50\u679c\u304c\u5909\u308f\u308b\nif(sampleArray.includes(10, 2)){\n    console.log(&quot;\u5024\u304c\u898b\u3064\u304b\u308a\u307e\u3057\u305f&quot;);\n}else{\n    console.log(&quot;\u5024\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f&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>true\nfalse\n\u5024\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8a18\u306e\u3088\u3046\u306b\u3001\u4f4d\u7f6e\u6307\u5b9a\u304c\u7121\u3044\u5834\u5408\u306f\u914d\u5217\u5168\u4f53\u304b\u3089\u691c\u7d22\u3057\u3001\u6307\u5b9a\u304c\u3042\u308b\u5834\u5408\u306b\u306f\u8a72\u5f53\u7b87\u6240\u304b\u3089\u672b\u5c3e\u307e\u3067\u3092\u691c\u7d22\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__3\" class=\"wp-block-heading\">\u6587\u5b57\u5217\uff08String\uff09\u306eincludes\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<p>\u7d9a\u3044\u3066\u3001\u6587\u5b57\u5217\u306e includes\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\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>\u6587\u5b57\u5217\u306e includes\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u306f\u3001\u4ee5\u4e0b\u306e\u901a\u308a\u3067\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>\u6587\u5b57\u5217.includes(\u691c\u7d22\u6587\u5b57\u5217, \u691c\u7d22\u958b\u59cb\u4f4d\u7f6e)<\/code><\/pre><\/div>\n\n\n\n<p>\u5f15\u6570\u306e\u5185\u5bb9\u3084\u623b\u308a\u5024\u306b\u3064\u3044\u3066\u306f\u3001\u4e00\u90e8\u306e\u9055\u3044\u3092\u9664\u3044\u3066\u3001\u914d\u5217\u306e includes\u30e1\u30bd\u30c3\u30c9\u3068\u307b\u3068\u3093\u3069\u5909\u308f\u308a\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>\u7b2c\uff11\u5f15\u6570\u306b\u6307\u5b9a\u3057\u305f\u6587\u5b57\u5217\u304c\u691c\u7d22\u5185\u5bb9\u3068\u306a\u308a\u3001\u5bfe\u8c61\u306e\u6587\u5b57\u5217\u306b\u542b\u307e\u308c\u3066\u3044\u308b\u5834\u5408\u306f true\u3001\u7121\u3044\u5834\u5408\u306f false\u304c\u8fd4\u5374\u3055\u308c\u307e\u3059\u3002<br>\u305f\u3060\u3057\u3001\u914d\u5217\u306e includes\u30e1\u30bd\u30c3\u30c9\u306e\u5834\u5408\u3001\u6587\u5b57\u5217\u306e\u5024\u306f\u5168\u6587\u4e00\u81f4\u3057\u305f\u5834\u5408\u306b\u306e\u307f true\u5224\u5b9a\u3068\u306a\u308a\u307e\u3059\u304c\u3001\u6587\u5b57\u5217\u306e includes\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u90e8\u5206\u4e00\u81f4\u3067\u3082 true\u5224\u5b9a\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u7b2c\uff12\u5f15\u6570\u306b\u306f\u3001\u540c\u3058\u304f\u691c\u7d22\u3092\u958b\u59cb\u3059\u308b\u4f4d\u7f6e\u3092\u4efb\u610f\u3067\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u914d\u5217\u306e\u5834\u5408\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u306e\u6307\u5b9a\u3068\u306a\u308a\u307e\u3059\u304c\u3001\u6587\u5b57\u5217\u306e\u5834\u5408\u306f\u5148\u982d\u304b\u3089\u6570\u3048\u3066\u4f55\u6587\u5b57\u76ee\u304b\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<br>\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u6570\u5024\u306f\u3001\u914d\u5217\u540c\u69d8\u306b\u5148\u982d\u3092\u8868\u3059\uff10\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u7df4\u7fd2\u3011<\/strong><\/p>\n\n\n\n<p>\u4e0b\u306e\u67a0\u3067\u90e8\u5206\u4e00\u81f4\u3001\u958b\u59cb\u4f4d\u7f6e\u306e\u6307\u5b9a\u306b\u3088\u308b\u7d50\u679c\u306e\u5909\u5316\u3001\u307e\u305f\u5927\u6587\u5b57\u3068\u5c0f\u6587\u5b57\u304c\u533a\u5225\u3055\u308c\u308b\u304b\u3069\u3046\u304b\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br>\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\/kqowZzJtMdNVFXxEFyVEVg?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 sampleStr = &quot;This is sampleCode&quot;;\n\n\/\/ \u90e8\u5206\u4e00\u81f4\u3067\u3082OK\nconsole.log(sampleStr.includes(&quot;sample&quot;));\n\n\/\/ \u914d\u5217\u540c\u69d8\u3001\u958b\u59cb\u4f4d\u7f6e\u306e\u6307\u5b9a\u3067\u7d50\u679c\u304c\u5909\u308f\u308b\nconsole.log(sampleStr.includes(&quot;sample&quot;, 10));\n\n\/\/ \u5927\u6587\u5b57\u3068\u5c0f\u6587\u5b57\u306f\u533a\u5225\u3055\u308c\u308b\nconsole.log(sampleStr.includes(&quot;this&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>true\nfalse\nfalse<\/code><\/pre><\/div>\n\n\n\n<p>\u6587\u5b57\u5217\u306b\u9650\u3089\u305a\u3001\u3069\u3061\u3089\u306e includes\u30e1\u30bd\u30c3\u30c9\u3067\u3082\u5f71\u97ff\u3059\u308b\u5927\u304d\u306a\u30dd\u30a4\u30f3\u30c8\u3068\u3057\u3066\u3001\u5927\u6587\u5b57\u3068\u5c0f\u6587\u5b57\u306f\u5225\u306e\u6587\u5b57\u3068\u3057\u3066\u5224\u5b9a\u3055\u308c\u307e\u3059\u3002<br>\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u898b\u308b\u3068\u5206\u304b\u308b\u3088\u3046\u306b\u3001\u5bfe\u8c61\u306e\u6587\u5b57\u5217\u5185\u304c \u300cThis\u300d \u3068\u5927\u6587\u5b57\u304c\u5165\u3063\u3066\u3044\u308b\u306e\u306b\u5bfe\u3057\u3001\u691c\u7d22\u3059\u308b\u6587\u5b57\u5217\u306f \u300cthis\u300d \u3068\u5168\u3066\u5c0f\u6587\u5b57\u306b\u306a\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306f false\u304c\u8fd4\u5374\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__4\" class=\"wp-block-heading\">indexOf\u30e1\u30bd\u30c3\u30c9\u3068\u306e\u4f7f\u3044\u5206\u3051<\/h2>\n\n\n\n<p>includes\u30e1\u30bd\u30c3\u30c9\u3068\u4f3c\u305f\u52d5\u304d\u3092\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u306e\uff11\u3064\u306b\u3001indexOf\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002<br>\u3053\u3061\u3089\u3082\u914d\u5217\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u6587\u5b57\u5217\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u305d\u308c\u305e\u308c\u3042\u308a\u307e\u3059\u304c\u3001\u57fa\u672c\u7684\u306a\u6a5f\u80fd\u306f\u540c\u3058\u3067\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>\u691c\u7d22\u5bfe\u8c61.indexOf(\u691c\u7d22\u5024, \u691c\u7d22\u958b\u59cb\u4f4d\u7f6e)<\/code><\/pre><\/div>\n\n\n\n<p>indexOf\u30e1\u30bd\u30c3\u30c9\u306f\u3001includes\u30e1\u30bd\u30c3\u30c9\u3068\u540c\u69d8\u306b\u6307\u5b9a\u306e\u5024\u304c\u5bfe\u8c61\u5185\u306b\u5b58\u5728\u3059\u308b\u304b\u3092\u5224\u65ad\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u304c\u3001\u623b\u308a\u5024\u304c\u7570\u306a\u308a\u307e\u3059\u3002<br>\u5024\u304c\u5b58\u5728\u3059\u308b\u5834\u5408\u306b\u306f\u3001\u8981\u7d20\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3084\u6587\u5b57\u5217\u306e\u4f4d\u7f6e\u3092\u6574\u6570\u5024\u3067\u8fd4\u3057\u3001\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306f -\uff11\u304c\u8fd4\u5374\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u7df4\u7fd2\u3011<\/strong><\/p>\n\n\n\n<p>\u4e0b\u306e\u67a0\u3067\u5b58\u5728\u3057\u306a\u3044\u5024\u3092\u691c\u7d22\u3057\u3066\u307f\u3066\u3001\u5b9f\u969b\u306b -1\u304c\u8fd4\u5374\u3055\u308c\u308b\u304b\u78ba\u304b\u3081\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br>\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\/jYW8NbcB1YWtvMLVHmGX5g?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, 4, 5];\nconst sampleStr = &quot;This is sampleCode&quot;;\n\n\/\/ \u914d\u5217\u306e\u5834\u5408\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3001\u6587\u5b57\u5217\u306e\u5834\u5408\u306f\u6587\u5b57\u4f4d\u7f6e\u3092\u8fd4\u3059\nconsole.log(sampleArray.indexOf(3));\nconsole.log(sampleStr.indexOf(&quot;sample&quot;));\n\n\/\/ \u958b\u59cb\u4f4d\u7f6e\u306e\u6307\u5b9a\u306fincludes\u3068\u540c\u3058\nconsole.log(sampleArray.indexOf(5, 2));\n\/\/ \u5024\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306f-1\u3092\u8fd4\u3059\nconsole.log(sampleStr.indexOf(&quot;this&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>2\n8\n4\n-1<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8a18\u3067\u89e3\u8aac\u3057\u305f\u3088\u3046\u306b\u3001\u914d\u5217\u306e\u5834\u5408\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3001\u6587\u5b57\u5217\u306e\u5834\u5408\u306f\u6587\u5b57\u4f4d\u7f6e\u304c\u8fd4\u5374\u3055\u308c\u308b\u3053\u3068\u304c\u3001\u7d50\u679c\u3092\u898b\u308b\u3068\u5206\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<p>\u5024\u304c\u5b58\u5728\u3059\u308b\u304b\u5426\u304b\u306e\u771f\u507d\u3067\u306f\u306a\u304f\u3001\u3069\u3053\u306b\u4f4d\u7f6e\u3059\u308b\u304b\u3092\u77e5\u308a\u305f\u3044\u5834\u5408\u306b\u306f\u3001indexOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 id=\"outline__5\" class=\"wp-block-heading\">some\u30e1\u30bd\u30c3\u30c9\u3068\u306e\u4f7f\u3044\u5206\u3051<\/h2>\n\n\n\n<p>includes\u30e1\u30bd\u30c3\u30c9\u3068\u4f3c\u305f\u52d5\u304d\u3092\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u306e\u3082\u3046\uff11\u3064\u306b\u3001some\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002<br>some\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u914d\u5217\u306e\u307f\u304c\u6301\u3064\u65e2\u5b58\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u691c\u7d22\u5024\u304c\u4e00\u81f4\u3057\u305f\u5834\u5408\u306e\u623b\u308a\u5024\u304c\u7570\u306a\u308b\u306e\u304c indexOf\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u3063\u305f\u306e\u306b\u5bfe\u3057\u3001some\u30e1\u30bd\u30c3\u30c9\u306f\u5024\u306e\u691c\u7d22\u65b9\u6cd5\u304c\u7570\u306a\u308a\u307e\u3059\u3002<br>includes\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u3001\u691c\u7d22\u5024\u304c\u5bfe\u8c61\u306e\u8981\u7d20\u3084\u6587\u5b57\u5217\u3068\u4e00\u81f4\u3059\u308b\u304b\u3069\u3046\u304b\u306e\u307f\u3067\u7d50\u679c\u3092\u5224\u65ad\u3057\u307e\u3059\u304c\u3001some\u30e1\u30bd\u30c3\u30c9\u306e\u5834\u5408\u306f\u5224\u5b9a\u306b\u4f7f\u7528\u3059\u308b\u6761\u4ef6\u5f0f\u3092\u81ea\u8eab\u3067\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\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> \u914d\u5217\u540d.some(\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570)<\/code><\/pre><\/div>\n\n\n\n<p>\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306b\u306f\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<br>\u95a2\u6570\u5185\u306b\u8a18\u8ff0\u3057\u305f\u6761\u4ef6\u5f0f\u306b\u57fa\u3065\u3044\u3066\u3001\u6307\u5b9a\u306e\u6761\u4ef6\u306b\u4e00\u81f4\u3059\u308b\u5024\u304c\u914d\u5217\u306b\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u5426\u304b\u3092\u5224\u65ad\u3057\u3001\u305d\u306e\u7d50\u679c\u3092\u771f\u507d\u5024\u3067\u8fd4\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3001\u5b9f\u969b\u306e\u52d5\u304d\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\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 = [5, 1, 8, 15, 3];\n\nconst result = sampleArray.some(function(value){\n    console.log(value);\n\treturn value &gt; 10;\n});\n\nconsole.log(result);<\/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>5\n1\n8\n15\ntrue<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8a18\u306e\u3088\u3046\u306b\u3001\u5224\u5b9a\u306b\u4f7f\u7528\u3059\u308b\u6761\u4ef6\u5f0f\u306f return\u6587\u3092\u4f7f\u3063\u3066\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30e1\u30bd\u30c3\u30c9\u306e\u5177\u4f53\u7684\u306a\u52d5\u304d\u3068\u3057\u3066\u306f\u3001\u5b9f\u884c\u7d50\u679c\u3092\u898b\u308b\u3068\u5206\u304b\u308b\u3088\u3046\u306b\u3001\u6761\u4ef6\u306b\u4e00\u81f4\u3059\u308b\u8981\u7d20\u304c\u73fe\u308c\u308b\u307e\u3067\u95a2\u6570\u5185\u306e\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3057\u5b9f\u884c\u3057\u3001\u6700\u521d\u306b true\u3068\u306a\u308b\u8981\u7d20\u304c\u73fe\u308c\u305f\u6642\u70b9\u3067\u691c\u7d22\u304c\u7d42\u4e86\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u95a2\u6570\u306e\u51e6\u7406\u3092\u7c21\u6f54\u306b\u8a18\u8ff0\u3067\u304d\u308b\u5834\u5408\u306f\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u3092\u4f7f\u7528\u3059\u308b\u3068\u3088\u308a\u77ed\u3044\u30b3\u30fc\u30c9\u3067\u8a18\u8ff0\u3059\u308b\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 sampleArray = [5, 1, 8, 15, 3];\n\nconst result = sampleArray.some(value =&gt; value % 2 === 0);\n\nconsole.log(result);<\/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>true<\/code><\/pre><\/div>\n\n\n\n<p>\u307e\u305f\u3001\u6761\u4ef6\u306f\u8907\u6570\u6307\u5b9a\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\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>const sampleArray = [5, 1, 8, 15, 3];\n\nconst result = sampleArray.some(value =&gt; value % 2 === 0 && value &gt; 10);\n\nconsole.log(result);<\/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>false<\/code><\/pre><\/div>\n\n\n\n<h2 id=\"outline__6\" class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u3044\u304b\u304c\u3067\u3057\u305f\u304b\uff1f\u4eca\u56de\u306f\u3001includes\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u914d\u5217\u3084\u6587\u5b57\u5217\u306a\u3069\u3092\u64cd\u4f5c\u3057\u305f\u308a\u3001\u5024\u306e\u691c\u7d22\u3092\u884c\u3063\u305f\u308a\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u3044\u305a\u308c\u3082\u5b9f\u969b\u306e\u958b\u767a\u3067\u4f7f\u7528\u3055\u308c\u308b\u30b1\u30fc\u30b9\u304c\u591a\u3005\u3042\u308b\u3082\u306e\u3067\u3059\u3002<br>includes\u30e1\u30bd\u30c3\u30c9\u3092\u542b\u3081\u3001\u4eca\u56de\u7d39\u4ecb\u3057\u305f\u30e1\u30bd\u30c3\u30c9\u3082\u307e\u305f\u899a\u3048\u3066\u304a\u3044\u3066\u640d\u306f\u306a\u3044\u306e\u3067\u3001\u305b\u3072\u4f7f\u3044\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3057\u3066\u3001\u4eca\u5f8c\u306e\u958b\u767a\u306b\u5f79\u7acb\u3066\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u306d\u3002<\/p>\n\n\n\n<h2 id=\"outline__7\" 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\u914d\u5217\u3084\u6587\u5b57\u5217\u3092\u6271\u3046\u969b\u306b\u3001\u7279\u5b9a\u306e\u5024\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3057\u305f\u3044\u6642\u304c\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002\u305d\u306e\u969b\u306b\u6d3b\u7528\u3067\u304d\u308b\u306e\u304c\u3001includes\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002 \u4eca\u56de\u306e\u8a18\u4e8b\u3067\u306f\u3001includes\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002includes\u30e1\u30bd\u30c3\u30c9\u306b\u4f3c\u305f\u50cd\u304d\u3092\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u306e\u52d5\u4f5c\u306b\u3064\u3044\u3066\u3084\u3001\u305d\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u3068 includes\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u5206\u3051\u308b\u30dd\u30a4\u30f3\u30c8\u306b\u3064\u3044\u3066\u3082\u89e3\u8aac\u3059\u308b\u306e [&hellip;]","protected":false},"author":11,"featured_media":9931,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-9929","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\/9929","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=9929"}],"version-history":[{"count":4,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts\/9929\/revisions"}],"predecessor-version":[{"id":10075,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts\/9929\/revisions\/10075"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/media\/9931"}],"wp:attachment":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/media?parent=9929"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/categories?post=9929"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/tags?post=9929"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}