{"id":9645,"date":"2025-07-04T15:51:57","date_gmt":"2025-07-04T06:51:57","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=9645"},"modified":"2025-11-07T21:34:08","modified_gmt":"2025-11-07T12:34:08","slug":"javascript-for","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/javascript-for\/","title":{"rendered":"\u3010JavaScript\u5165\u9580\u3011for\u6587\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\/for\u2026of\u3084for\u2026in\u306e\u4f7f\u3044\u65b9\u3082\u8a73\u3057\u304f\u89e3\u8aac"},"content":{"rendered":"\n<p>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u884c\u3046\u4e0a\u3067\u540c\u3058\u3088\u3046\u306a\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3057\u5b9f\u884c\u3057\u305f\u3044\u3068\u304d\u3001\u305d\u3046\u3044\u3063\u305f\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u884c\u3046\u305f\u3081\u306e\u5c02\u7528\u306e\u69cb\u6587\u304c\u8a00\u8a9e\u306e\u6a19\u6e96\u6a5f\u80fd\u3068\u3057\u3066\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u307b\u3068\u3093\u3069\u3067\u3059\u3002<\/p>\n\n\n\n<p>JavaScript\u3067\u306f for \u6587\u3068\u3044\u3046\u69cb\u6587\u3092\u4f7f\u3046\u3053\u3068\u3067\u57fa\u672c\u7684\u306a\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u4eca\u56de\u306f\u3001for\u6587\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u304b\u3089\u5fdc\u7528\u65b9\u6cd5\u306a\u3069\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\uff01<\/p>\n\n\n\n<h2 id=\"outline__1\" class=\"wp-block-heading\">for\u6587\u306e\u30eb\u30fc\u30d7\u51e6\u7406\u3068\u306f\uff1f<\/h2>\n\n\n\n<p>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u306f\u3001\u4f7f\u7528\u3059\u308b\u8a00\u8a9e\u3054\u3068\u306b\u8a18\u8ff0\u65b9\u6cd5\u3084\u5b9f\u88c5\u53ef\u80fd\u306a\u6a5f\u80fd\u304c\u7570\u306a\u308a\u307e\u3059\u304c\u3001\u3044\u305a\u308c\u306e\u8a00\u8a9e\u3067\u3082\u5fc5\u305a\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u6a5f\u80fd\u304c\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u3002<br>\u305d\u306e\u3046\u3061\u306e1\u3064\u304c\u3001\u3044\u308f\u3086\u308b\u30eb\u30fc\u30d7\u51e6\u7406\u3068\u547c\u3070\u308c\u308b\u53cd\u5fa9\u51e6\u7406\u6a5f\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<p>JavaScript\u3067\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u969b\u306b\u4f7f\u7528\u3059\u308b\u306e\u304cfor\u6587\u3067\u3059\u3002<br>\u4e00\u5b9a\u306e\u6cd5\u5247\u306b\u57fa\u3065\u304d\u3001\u6c7a\u3081\u3089\u308c\u305f\u56de\u6570\u3060\u3051\u540c\u3058\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3057\u305f\u3044\u5834\u5408\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u540c\u3058\u304f\u30eb\u30fc\u30d7\u51e6\u7406\u306e\u5b9f\u88c5\u306b\u4f7f\u7528\u3067\u304d\u308b while \u6587\u3068\u3044\u3046\u69cb\u6587\u3082\u3042\u308a\u307e\u3059\u304c\u3001\u3053\u3061\u3089\u306f\u7e70\u308a\u8fd4\u3059\u56de\u6570\u304c\u6c7a\u307e\u3063\u3066\u3044\u306a\u3044 (\u7279\u5b9a\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u307e\u3067\u7e70\u308a\u8fd4\u3057\u7d9a\u3051\u308b) \u5834\u5408\u306b\u4f7f\u7528\u3059\u308b\u305f\u3081\u3001\u30eb\u30fc\u30d7\u56de\u6570\u304c\u660e\u78ba\u306b\u5b9a\u307e\u3063\u3066\u3044\u308b\u304b\u5426\u304b\u3067\u4f7f\u3044\u5206\u3051\u3092\u3059\u308b\u3068\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>for\u6587\u3092\u542b\u3080\u30eb\u30fc\u30d7\u51e6\u7406\u306f\u3001\u57fa\u672c\u7684\u306a\u6a5f\u80fd\u3067\u3042\u308a\u306a\u304c\u3089\u6d3b\u7528\u3067\u304d\u308b\u7bc4\u56f2\u304c\u5e45\u5e83\u304f\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u884c\u3046\u4e0a\u3067\u306e\u5fc5\u9808\u6a5f\u80fd\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__2\" class=\"wp-block-heading\">for\u6587\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<p>\u307e\u305a\u306f\u3001for\u6587\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\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\u3068\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>for\u6587\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5f62\u5f0f\u3067\u69cb\u6587\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>for (\u521d\u671f\u5316\u5f0f;  \u6761\u4ef6\u5f0f;  \u5909\u5316\u5f0f) {\n  \/\/ \u7e70\u308a\u8fd4\u3057\u305f\u3044\u51e6\u7406\u5185\u5bb9\n}<\/code><\/pre><\/div>\n\n\n\n<p>for\u6587\u3067\u306f\u3001\u30eb\u30fc\u30d7\u5ea6\u306b\u4e00\u5b9a\u306e\u57fa\u6e96\u3067\u6570\u5024\u304c\u5897\u6e1b\u3059\u308b\u5909\u6570 (\u30ab\u30a6\u30f3\u30bf\u30fc\u5909\u6570) \u3092\u5b9a\u7fa9\u3057\u3001\u30d6\u30ed\u30c3\u30af\u5185\u3067\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u521d\u671f\u5316\u5f0f\u306f\u4e3b\u306b\u3001\u3053\u306e\u30ab\u30a6\u30f3\u30bf\u30fc\u5909\u6570\u3092\u521d\u671f\u5316\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u6761\u4ef6\u5f0f\u306f\u3001\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u7d9a\u884c\u3059\u308b\u304b\u5426\u304b\u3092\u5224\u65ad\u3059\u308b\u305f\u3081\u306e\u5f0f\u3067\u3059\u3002<br>\u5404\u30eb\u30fc\u30d7\u306e\u5b9f\u884c\u524d\u306b\u5224\u5b9a\u304c\u884c\u308f\u308c\u3001true\u306e\u5834\u5408\u306b\u30d6\u30ed\u30c3\u30af\u5185\u306e\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5909\u5316\u5f0f\u306f\u3001\u5404\u30eb\u30fc\u30d7\u306e\u51e6\u7406\u5b8c\u4e86\u5f8c\u306b\u5b9f\u884c\u3055\u308c\u308b\u5f0f\u3067\u3059\u3002<br>\u57fa\u672c\u7684\u306b\u3001\u30ab\u30a6\u30f3\u30bf\u30fc\u5909\u6570\u306e\u5024\u304c\u3044\u304f\u3064\u5897\u6e1b\u3059\u308b\u304b\u3092\u6307\u5b9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\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>for (let count = 1;count &lt; 6;count++) {\n  console.log(count + &#39;\u56de\u76ee\u306e\u51e6\u7406\u3067\u3059\u3002&#39;);\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\u56de\u76ee\u306e\u51e6\u7406\u3067\u3059\u3002\n2\u56de\u76ee\u306e\u51e6\u7406\u3067\u3059\u3002\n3\u56de\u76ee\u306e\u51e6\u7406\u3067\u3059\u3002\n4\u56de\u76ee\u306e\u51e6\u7406\u3067\u3059\u3002\n5\u56de\u76ee\u306e\u51e6\u7406\u3067\u3059\u3002<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u306e\u5834\u5408\u3001\u300clet count = 1\u300d \u304c\u521d\u671f\u5316\u5f0f\u3001\u300ccount &lt; 6\u300d \u304c\u6761\u4ef6\u5f0f\u3001\u300ccount++\u300d \u304c\u5909\u5316\u5f0f\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u306b\u4f34\u3044\u3001\u5909\u6570 count \u306e\u6570\u5024\u304c1\u304b\u3089\u59cb\u307e\u308a\u3001\u5404\u30eb\u30fc\u30d7\u306e\u51e6\u7406\u304c\u7d42\u308f\u308b\u3054\u3068\u306b\u6570\u5024\u304c1\u305a\u3064\u5897\u3048\u3066\u3044\u304d\u307e\u3059\u3002<br>\u305d\u3057\u3066\u3001\u30eb\u30fc\u30d7\u3092\u7d9a\u3051\u308b\u6761\u4ef6\u304c count \u306e\u5024\u304c6\u672a\u6e80\u306e\u5834\u5408\u3068\u306a\u3063\u3066\u3044\u308b\u305f\u3081\u30015\u56de\u76ee\u306e\u51e6\u7406\u304c\u5b8c\u4e86\u3057\u305f\u6642\u70b9\u3067\u30eb\u30fc\u30d7\u51e6\u7406\u304c\u7d42\u4e86\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u305d\u308c\u305e\u308c\u306e\u5f15\u6570\u306b\u6307\u5b9a\u3059\u308b\u6570\u5024\u3092\u8abf\u6574\u3059\u308b\u3053\u3068\u3067\u3001\u4efb\u610f\u306e\u56de\u6570\u3060\u3051\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u4ee5\u4e0a\u304cfor\u6587\u306e\u57fa\u672c\u7684\u306a\u52d5\u4f5c\u3067\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__2_2\" class=\"wp-block-heading\">\u914d\u5217\u3092\u4f7f\u3063\u3066\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u3059\u308b<\/h3>\n\n\n\n<p>\u30eb\u30fc\u30d7\u51e6\u7406\u304c\u4f7f\u7528\u3055\u308c\u308b\u4e00\u4f8b\u3068\u3057\u3066\u3001\u914d\u5217\u3092\u6271\u3046\u30d1\u30bf\u30fc\u30f3\u304c\u5b9f\u969b\u306e\u958b\u767a\u3067\u3082\u3088\u304f\u3042\u308a\u307e\u3059\u3002<br>\u4eca\u5ea6\u306f\u3001for\u6587\u3092\u4f7f\u7528\u3057\u3066\u914d\u5217\u306e\u8981\u7d20\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u4f8b\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 = [&#39;\u308a\u3093\u3054&#39;, &#39;\u3076\u3069\u3046&#39;, &#39;\u3044\u3061\u3054&#39;, &#39;\u307f\u304b\u3093&#39;, &#39;\u3082\u3082&#39;];\n\nfor (let count = 0; count &lt; sampleArray.length; count++) {\n  console.log(sampleArray[count]);\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>\u308a\u3093\u3054\n\u3076\u3069\u3046\n\u3044\u3061\u3054\n\u307f\u304b\u3093\n\u3082\u3082<\/code><\/pre><\/div>\n\n\n\n<p>for\u6587\u3067\u914d\u5217\u3092\u6271\u3046\u969b\u306b\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u30dd\u30a4\u30f3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305a\uff11\u3064\u306b\u3001\u30eb\u30fc\u30d7\u51e6\u7406\u5185\u3067\u914d\u5217\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u5834\u5408\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u306e\u6307\u5b9a\u306b\u306f\u30ab\u30a6\u30f3\u30bf\u30fc\u5909\u6570\u3092\u6d3b\u7528\u3057\u307e\u3057\u3087\u3046\u3002<br>\u30ab\u30a6\u30f3\u30bf\u30fc\u5909\u6570\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u81ea\u52d5\u3067\u756a\u53f7\u304c\u5909\u52d5\u3059\u308b\u305f\u3081\u3001\u5404\u756a\u53f7\u3054\u3068\u306b\u30b3\u30fc\u30c9\u3092\u5206\u3051\u3066\u8a18\u8ff0\u3059\u308b\u5fc5\u8981\u304c\u306a\u304f\u306a\u308a\u3001\u5c11\u306a\u3044\u30b3\u30fc\u30c9\u3067\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u914d\u5217\u306e\u8981\u7d20\u6570\u306e\u5206\u3060\u3051\u30eb\u30fc\u30d7\u3057\u305f\u3044\u6642\u306f\u3001length\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u7528\u3059\u308b\u3068\u4fbf\u5229\u3067\u3059\u3002<br>length\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u5bfe\u8c61\u306e\u914d\u5217\u306e\u8981\u7d20\u6570\u3092\u8fd4\u5374\u3057\u3066\u304f\u308c\u308b\u305f\u3081\u3001\u6761\u4ef6\u5f0f\u3067\u306e\u6bd4\u8f03\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u30eb\u30fc\u30d7\u56de\u6570\u3092\u81ea\u52d5\u3067\u8abf\u6574\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305f\u3060\u3057\u3001\u914d\u5217\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u306f0\u304b\u3089\u958b\u59cb\u3055\u308c\u308b\u305f\u3081\u3001\u5168\u3066\u306e\u8981\u7d20\u306b\u30a2\u30af\u30bb\u30b9\u3057\u305f\u3044\u5834\u5408\u306f\u30ab\u30a6\u30f3\u30bf\u30fc\u5909\u6570\u306e\u521d\u671f\u5024\u30920\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ed6\u306e\u6570\u5024\u3092\u6307\u5b9a\u3057\u3066\u3057\u307e\u3046\u3068\u3001\u4e00\u90e8\u306e\u8981\u7d20\u304c\u51e6\u7406\u3055\u308c\u306a\u304f\u306a\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u610f\u56f3\u3057\u306a\u3044\u52d5\u4f5c\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u306b\u3082\u306a\u308a\u5f97\u308b\u305f\u3081\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__3\" class=\"wp-block-heading\">for\u6587\u3092\u4f7f\u7528\u3059\u308b\u4e0a\u3067\u6ce8\u610f\u3059\u3079\u304d\u30dd\u30a4\u30f3\u30c8<\/h2>\n\n\n\n<p>for\u6587\u306b\u306f\u4e00\u70b9\u3001\u4f7f\u7528\u3059\u308b\u4e0a\u3067\u6ce8\u610f\u3059\u308b\u3079\u304d\u30dd\u30a4\u30f3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305a\u306f\u3001\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\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>for (let count = 0; count &lt; 5; count++) {\n  console.log(count);\n}\n\nconsole.log(count);<\/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>0\n1\n2\n3\n4\nUncaught ReferenceError: count is not defined<\/code><\/pre><\/div>\n\n\n\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4e00\u756a\u4e0b\u306e\u51fa\u529b\u51e6\u7406\u306e\u90e8\u5206\u3067\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002<br>\u4f55\u6545\u306a\u3089\u3001for\u6587\u3067\u5ba3\u8a00\u3055\u308c\u305f\u30ab\u30a6\u30f3\u30bf\u30fc\u5909\u6570 count \u306ffor\u6587\u306e\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7\uff08\u6ce2\u62ec\u5f27\u306e\u5185\u5074\u306e\u90e8\u5206\uff09\u306e\u4e2d\u3067\u3057\u304b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u7d9a\u3044\u3066\u3001\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\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>for(var count = 0; count &lt; 5; count++) {\n\n  console.log(count);\n}\n\nconsole.log(count);<\/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>0\n1\n2\n3\n4\n5<\/code><\/pre><\/div>\n\n\n\n<p>\u30b3\u30fc\u30c9\u306e\u5185\u5bb9\u81ea\u4f53\u306f\u3001for\u6587\u306e\u521d\u671f\u5316\u5f0f\u3067 let \u3067\u306a\u304f var \u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u70b9\u4ee5\u5916\u306f\u3001\u5148\u307b\u3069\u3068\u4f55\u3082\u5909\u308f\u308a\u307e\u305b\u3093\u3002<br>\u3067\u3059\u304c\u3001\u3053\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u4eca\u5ea6\u306f\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u3053\u3068\u306a\u304f\u6b63\u5e38\u306b\u4f5c\u52d5\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001var \u3067\u5ba3\u8a00\u3055\u308c\u305f\u5834\u5408\u306e\u30ab\u30a6\u30f3\u30bf\u30fc\u5909\u6570\u306f\u3001\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306b\u306f\u306a\u3089\u305a\u306b\u30d6\u30ed\u30c3\u30af\u5916\u3067\u3082\u4f7f\u7528\u3067\u304d\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e2\u3064\u306e\u30b3\u30fc\u30c9\u306e\u5927\u304d\u306a\u9055\u3044\u306f\u3001let \u3068 var \u3067\u5ba3\u8a00\u3055\u308c\u305f\u5909\u6570\u304c\u6709\u52b9\u306b\u306a\u308b\u7bc4\u56f2\u304c\u305d\u308c\u305e\u308c\u7570\u306a\u3063\u3066\u3044\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u73fe\u5728\u306eJavaScript\u306e\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3067\u5909\u6570\u306e\u5ba3\u8a00\u306b\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b let \u3084 const \u306f\u3001\u95a2\u6570\u3084for\u6587\u306a\u3069\u306e\u30d6\u30ed\u30c3\u30af\u306e\u4e2d\u3067\u5ba3\u8a00\u3055\u308c\u308b\u3068\u3001\u305d\u306e\u4e2d\u3060\u3051\u3067\u6709\u52b9\u306b\u306a\u308b\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7\u3068\u3044\u3046\u6709\u52b9\u7bc4\u56f2\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4e00\u65b9\u3067\u3001JavaScript\u306b\u3082\u3068\u3082\u3068\u3042\u3063\u305f var \u306f\u30b0\u30ed\u30fc\u30d0\u30eb\u30b9\u30b3\u30fc\u30d7\u3068\u3044\u3063\u3066\u3001var\u3067\u5ba3\u8a00\u3055\u308c\u305f\u5909\u6570\u306f\u30d7\u30ed\u30b0\u30e9\u30e0\u5168\u4f53\u3092\u6709\u52b9\u7bc4\u56f2\u3068\u3059\u308b\u4ed5\u69d8\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u30012\u3064\u3081\u306e\u30b3\u30fc\u30c9\u3067\u306ffor\u6587\u306e\u4e2d\u3067\u5ba3\u8a00\u3055\u308c\u305f\u5909\u6570\u304cfor\u6587\u306e\u30d6\u30ed\u30c3\u30af\u3092\u629c\u3051\u3066\u3082\u6709\u52b9\u306a\u307e\u307e\u306b\u306a\u3063\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u5909\u6570\u306e\u6709\u52b9\u7bc4\u56f2 (\u30b9\u30b3\u30fc\u30d7) \u306e\u9055\u3044\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u5168\u4f53\u306e\u51e6\u7406\u306b\u4e0e\u3048\u308b\u5f71\u97ff\u3082\u5927\u304d\u3044\u305f\u3081\u3001\u4f7f\u7528\u306e\u969b\u306b\u306f\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__4\" class=\"wp-block-heading\">for\u6587\u306e\u30eb\u30fc\u30d7\u51e6\u7406\u306e\u9014\u4e2d\u3067\u30eb\u30fc\u30d7\u3092\u629c\u3051\u308b<\/h2>\n\n\n\n<p>\u5148\u307b\u3069\u307e\u3067\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306f\u5168\u3066\u3001\u6307\u5b9a\u3057\u305f\u56de\u6570\u5206\u3060\u3051\u5fc5\u305a\u30eb\u30fc\u30d7\u3059\u308b\u51e6\u7406\u5185\u5bb9\u3067\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u3067\u3059\u304c for\u6587\u3067\u306f\u3001\u9014\u4e2d\u3067\u51e6\u7406\u3092\u4e2d\u65ad\u3057\u3066\u30eb\u30fc\u30d7\u3092\u629c\u3051\u305f\u308a\u3001\u4efb\u610f\u306e\u30eb\u30fc\u30d7\u56de\u306e\u307f\u51e6\u7406\u3092\u30b9\u30ad\u30c3\u30d7\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u308c\u305e\u308c\u306e\u8a73\u3057\u3044\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 id=\"outline__4_1\" class=\"wp-block-heading\">continue\u3067\u7279\u5b9a\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u3060\u3051\u51e6\u7406\u3092\u30b9\u30ad\u30c3\u30d7<\/h3>\n\n\n\n<p>\u300c\u7279\u5b9a\u306e\u6761\u4ef6\u4e0b\u306e\u307f\u3001\u51e6\u7406\u3092\u30b9\u30ad\u30c3\u30d7\u3057\u305f\u3044\u300d \u3068\u3044\u3063\u305f\u30b1\u30fc\u30b9\u3067\u6d3b\u7528\u3067\u304d\u308b\u306e\u304c\u3001continue\u6587\u3067\u3059\u3002<br>continue\u6587\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u305d\u308c\u4ee5\u964d\u306b\u8a18\u8ff0\u3055\u308c\u305f\u30eb\u30fc\u30d7\u5185\u306e\u51e6\u7406\u304c\u30b9\u30ad\u30c3\u30d7\u3055\u308c\u3001\u6b21\u306e\u30eb\u30fc\u30d7\u56de\u3078\u3068\u5373\u5ea7\u306b\u79fb\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\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>for (let count = 0; count &lt; 10; count++) {\n    \/\/ \u5947\u6570\u306e\u6642\u306f\u51e6\u7406\u3092\u884c\u308f\u306a\u3044\n    if(count % 2 === 1) continue;\n    console.log(count);\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>0\n2\n4\n6\n8<\/code><\/pre><\/div>\n\n\n\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001if\u6587\u3067\u30ab\u30a6\u30f3\u30bf\u30fc\u5909\u6570\u306e\u5024\u304c\u5947\u6570\u304b\u5426\u304b\u306e\u6761\u4ef6\u5206\u3051\u3092\u884c\u3044\u3001true\u306e\u5834\u5408\u306b\u51fa\u529b\u8868\u793a\u51e6\u7406\u3092\u30b9\u30ad\u30c3\u30d7\u3059\u308b\u3088\u3046 continue \u6587\u3092\u8a18\u8ff0\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5b9f\u884c\u7d50\u679c\u3092\u898b\u308b\u3068\u3001\u8868\u793a\u3055\u308c\u3066\u3044\u308b\u6570\u5024\u306f\u5168\u3066\u5076\u6570\u3068\u306a\u3063\u3066\u304a\u308a\u3001\u6761\u4ef6\u306e\u901a\u308a\u306b\u51e6\u7406\u304c\u30b9\u30ad\u30c3\u30d7\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001continue\u6587\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u306f if\u6587\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u6d3b\u7528\u3059\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__4_2\" class=\"wp-block-heading\">break\u3067\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u4e2d\u65ad\u3059\u308b<\/h3>\n\n\n\n<p>\u7d9a\u3044\u3066\u3001for\u6587\u3067\u4e2d\u65ad\u51e6\u7406\u3092\u884c\u3046\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5148\u307b\u3069\u306e continue \u6587\u306e\u5834\u5408\u306f\u3001\u3042\u304f\u307e\u3067\u305d\u306e\u30eb\u30fc\u30d7\u56de\u306e\u51e6\u7406\u304c\u30b9\u30ad\u30c3\u30d7\u3055\u308c\u308b\u306e\u307f\u3067\u30eb\u30fc\u30d7\u51e6\u7406\u305d\u306e\u3082\u306e\u306f\u7d99\u7d9a\u3055\u308c\u308b\u4ed5\u69d8\u3067\u3057\u305f\u304c\u3001\u51e6\u7406\u3092\u5b8c\u5168\u306b\u4e2d\u65ad\u3057 for \u6587\u3092\u7d42\u4e86\u3055\u305b\u308b\u65b9\u6cd5\u3082\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>for\u6587\u306e\u4e2d\u65ad\u51e6\u7406\u3092\u884c\u3044\u305f\u3044\u5834\u5408\u306f\u3001break \u6587\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\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>for (let count = 0; count &lt; 10; count++) {\n    \/\/ \u5909\u6570\u306e\u5024\u304c\uff15\u4ee5\u4e0a\u306b\u306a\u3063\u305f\u3089\u4e2d\u65ad\u3059\u308b\n    if (count &gt;= 5) break;\n    console.log(count);\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>0\n1\n2\n3\n4<\/code><\/pre><\/div>\n\n\n\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001\u30ab\u30a6\u30f3\u30bf\u30fc\u5909\u6570\u304c\uff15\u4ee5\u4e0a\u306b\u306a\u3063\u305f\u6bb5\u968e\u3067\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u4e2d\u65ad\u3059\u308b\u3088\u3046\u8a18\u8ff0\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5b9f\u884c\u7d50\u679c\u3092\u898b\u308b\u3068\u3001\u5909\u6570\u306e\u5024\u304c4\u306e\u72b6\u614b\u304c\u6700\u5f8c\u3068\u306a\u308a\u30015\u306b\u5230\u9054\u3057\u305f\u6642\u70b9\u3067\u51e6\u7406\u304c\u4e2d\u65ad\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u30b9\u30ad\u30c3\u30d7\u3057\u305f\u30eb\u30fc\u30d7\u56de\u4ee5\u5916\u306f\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u3066\u3044\u305f continue \u6587\u3068\u7570\u306a\u308a\u3001break \u6587\u306f\u5b9f\u884c\u3055\u308c\u305f\u6642\u70b9\u3067\u30eb\u30fc\u30d7\u51e6\u7406\u305d\u306e\u3082\u306e\u304c\u4e2d\u65ad\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__5\" class=\"wp-block-heading\">for \u2026 of\u3067\u914d\u5217\u3084\u30de\u30c3\u30d7\u306e\u4e2d\u8eab\u3092\u53d6\u308a\u51fa\u3057\u3066\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u3059\u308b<\/h2>\n\n\n\n<p>JavaScript\u3067\u4f7f\u7528\u3067\u304d\u308b\u30eb\u30fc\u30d7\u51e6\u7406\u65b9\u6cd5\u306e\uff11\u3064\u306b\u3001for \u2026 of \u6587\u304c\u3042\u308a\u307e\u3059\u3002<br>\u901a\u5e38\u306efor\u6587\u3068\u3069\u306e\u3088\u3046\u306b\u52d5\u304d\u304c\u7570\u306a\u308b\u306e\u304b\u3001\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u304b\u3089\u9806\u306b\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__2_1\" class=\"wp-block-heading\">\u57fa\u672c\u69cb\u6587\u3068\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>for &#8230; of\u6587\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\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>for (\u5909\u6570\u540d of \u53cd\u5fa9\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8) {\n    \/\/ \u7e70\u308a\u8fd4\u3057\u305f\u3044\u51e6\u7406\u5185\u5bb9\n}<\/code><\/pre><\/div>\n\n\n\n<p>for \u2026of\u6587\u306f\u3001\u5f8c\u8ff0\u3059\u308b\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u6301\u3064\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff08\u53cd\u5fa9\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09\u306b\u5bfe\u3057\u3066\u4f7f\u7528\u53ef\u80fd\u306a\u69cb\u6587\u3067\u3059\u3002<br>\u6761\u4ef6\u5f0f\u306a\u3069\u3092\u3082\u3068\u306b\u30eb\u30fc\u30d7\u56de\u6570\u3092\u6307\u5b9a\u3059\u308b for \u6587\u3068\u306f\u7570\u306a\u308a\u3001\u914d\u5217\u3084\u30de\u30c3\u30d7\u306a\u3069\u306e\u53cd\u5fa9\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089\u8981\u7d20\u3092\u9806\u306b\u53d6\u308a\u51fa\u3057\u3066\u51e6\u7406\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u8981\u7d20\u304c\u76f4\u63a5\u5909\u6570\u306b\u4ee3\u5165\u3055\u308c\u308b\u305f\u3081\u3001for\u6587\u3092\u4f7f\u3063\u3066\u8a18\u8ff0\u3059\u308b\u3088\u308a\u3082\u30b3\u30fc\u30c9\u304c\u3088\u308a\u7c21\u6f54\u306b\u306a\u308a\u3001\u51e6\u7406\u5185\u5bb9\u306e\u610f\u56f3\u3082\u8aad\u307f\u53d6\u308a\u3084\u3059\u304f\u306a\u308b\u3068\u3044\u3046\u5229\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\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 = [&#39;\u308a\u3093\u3054&#39;, &#39;\u3076\u3069\u3046&#39;, &#39;\u3044\u3061\u3054&#39;, &#39;\u307f\u304b\u3093&#39;, &#39;\u3082\u3082&#39;];\n\nfor (let fruit of sampleArray) {\n  console.log(fruit);\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>\u308a\u3093\u3054\n\u3076\u3069\u3046\n\u3044\u3061\u3054\n\u307f\u304b\u3093\n\u3082\u3082<\/code><\/pre><\/div>\n\n\n\n<p>for\u6587\u306e\u5834\u5408\u306f\u3001\u30ab\u30a6\u30f3\u30bf\u30fc\u5909\u6570\u3092\u3082\u3068\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u3092\u6307\u5b9a\u3057\u3066\u8981\u7d20\u3092\u53d6\u308a\u51fa\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3057\u305f\u304c\u3001for &#8230; of\u6587\u3067\u306f\u3053\u306e\u3088\u3046\u306b\u8981\u7d20\u304c\u76f4\u63a5\u5909\u6570\u306b\u4ee3\u5165\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>for\u6587\u3067\u4f7f\u7528\u53ef\u80fd\u3067\u3042\u3063\u305f continue\u6587\u3084 break\u6587\u306b\u3064\u3044\u3066\u306f\u3001for &#8230; of\u6587\u3067\u3082\u540c\u69d8\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__5_2\" class=\"wp-block-heading\">\u6ce8\u610f\u3059\u308b\u30dd\u30a4\u30f3\u30c8\uff1a\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u6271\u3044<\/h3>\n\n\n\n<p>for \u2026 of\u6587\u306f\u4e0a\u8ff0\u306e\u901a\u308a\u3001\u53cd\u5fa9\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3057\u3066\u4f7f\u7528\u3067\u304d\u308b\u69cb\u6587\u306e\u305f\u3081\u3001\u305d\u308c\u4ee5\u5916\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u4f7f\u304a\u3046\u3068\u3059\u308b\u3068\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u53cd\u5fa9\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u306f\u3001\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u6301\u3064\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u3053\u3068\u3092\u8a00\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30a4\u30c6\u30ec\u30fc\u30bf\u306f\u3001\u914d\u5217\u3084\u30ea\u30b9\u30c8\u306a\u3069\u306e\u8981\u7d20\u306b\u9806\u756a\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u305f\u3081\u306e\u4ed5\u7d44\u307f\u3067\u3059\u3002<br>JavaScript\u306b\u304a\u3044\u3066\u306f\u3001next()\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3057\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u3053\u3068\u3092\u30a4\u30c6\u30ec\u30fc\u30bf\u3068\u547c\u3073\u307e\u3059\u3002<\/p>\n\n\n\n<p>for &#8230; of\u6587\u306f\u3001\u3053\u306e\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u4ed5\u7d44\u307f\u3092\u5229\u7528\u3057\u3066\u52d5\u4f5c\u3059\u308b\u69cb\u6587\u306e\u305f\u3081\u3001\u53cd\u5fa9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3057\u3066\u306e\u307f\u4f7f\u7528\u304c\u53ef\u80fd\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>JavaScript\u3067\u53cd\u5fa9\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5206\u985e\u3055\u308c\u308b\u3082\u306e\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u914d\u5217<\/li>\n\n\n\n<li>\u6587\u5b57\u5217<\/li>\n\n\n\n<li>Map<\/li>\n\n\n\n<li>Set<\/li>\n\n\n\n<li>arguments<\/li>\n\n\n\n<li>DOM<\/li>\n<\/ul>\n\n\n\n<p>\u6570\u5024\u578b\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u578b\u306a\u3069\u306b\u5bfe\u3057\u3066\u306f\u4f7f\u7528\u304c\u3067\u304d\u306a\u3044\u306e\u3067\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__5_3\" class=\"wp-block-heading\">\u3010\u5fdc\u7528\u7de8\u3011for await &#8230; of\u306e\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>for &#8230; of\u6587\u3068\u4f3c\u305f\u69cb\u6587\u306b\u3001for await \u2026 of\u6587\u3068\u3044\u3046\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>for await &#8230; of\u6587\u306f\u3001\u975e\u540c\u671f\u306e\u53cd\u5fa9\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff08AsyncIterable\uff09\u3092\u30eb\u30fc\u30d7\u51e6\u7406\u3059\u308b\u305f\u3081\u306e\u5236\u5fa1\u6587\u3067\u3059\u3002<br>\u4f8b\u3048\u3070API\u306e\u30ec\u30b9\u30dd\u30f3\u30b9\u306a\u3069\u3001\u975e\u540c\u671f\u51e6\u7406\u306e\u7d50\u679c\u3092\u4e00\u5ea6\u306b\u307e\u3068\u3081\u3066\u53d7\u3051\u53d6\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u9806\u7e70\u308a\u306b\u53d7\u3051\u53d6\u308a\u305f\u3044\u5834\u5408\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306f\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\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 sleep = (s) =&gt; new Promise(f =&gt; setTimeout(f, s * 1000));\n \nasync function* foo() {\n  yield 1;\n  await sleep(1);\n  yield 2;\n  await sleep(1);\n  yield 3;\n}\n \n(async () =&gt; {\n  for await (const value of foo()) {\n    console.log(value);\n  }\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>\u975e\u540c\u671f\u51e6\u7406\u306e\u5185\u5bb9\u3092\u9010\u6b21\u5b9f\u884c\u3057\u305f\u3044\u5834\u5408\u306e\u8a18\u8ff0\u65b9\u6cd5\u306f\u4ed6\u306b\u3082\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u304c\u3001\u624b\u6bb5\u306e\uff11\u3064\u3068\u3057\u3066\u899a\u3048\u3066\u304a\u304f\u3068\u4fbf\u5229\u3067\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__6\" class=\"wp-block-heading\">for &#8230; in\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<p>\u7d9a\u3044\u3066\u3001\u540c\u3058\u304f\u30eb\u30fc\u30d7\u51e6\u7406\u306e\u8a18\u8ff0\u65b9\u6cd5\u306e\uff11\u3064\u3067\u3042\u308b for &#8230; in\u6587\u3082\u5408\u308f\u305b\u3066\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u304b\u3089\u3001for\u6587\u3084 for &#8230; of\u6587\u3068\u306e\u9055\u3044\u306a\u3069\u306b\u3064\u3044\u3066\u3082\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u306e\u3067\u3001\u9806\u306b\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\u3068\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>for &#8230; in\u6587\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\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>for (\u5909\u6570\u540d in \u30aa\u30d6\u30b8\u30a7\u30af\u30c8) {\n   \/\/ \u7e70\u308a\u8fd4\u3057\u305f\u3044\u51e6\u7406\u5185\u5bb9\n}<\/code><\/pre><\/div>\n\n\n\n<p>for &#8230; in\u6587\u306f\u3001\u4e3b\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u578b\u306e\u3088\u3046\u306a\u5217\u6319\u53ef\u80fd\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u6301\u3064\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53cd\u5fa9\u51e6\u7406\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b\u5236\u5fa1\u6587\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4e00\u756a\u306e\u5927\u304d\u306a\u7279\u5fb4\u3068\u3057\u3066\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3042\u308c\u3070\u30ad\u30fc\u3001\u914d\u5217\u3067\u3042\u308c\u3070\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u3068\u3044\u3063\u305f\u3088\u3046\u306b\u3001\u8981\u7d20\u306e\u5024\u3067\u306f\u306a\u304f\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u5909\u6570\u306b\u4ee3\u5165\u3059\u308b\u70b9\u306b\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\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 sampleObject = {\n    name : &#39;\u5c71\u7530\u592a\u90ce&#39;,\n    age : 19,\n    job : &#39;\u5927\u5b66\u751f&#39;\n}\n\nfor (let key in sampleObject) {\n    console.log( key + &#39;\uff1a&#39; + sampleObject[key]);\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>name\uff1a\u5c71\u7530\u592a\u90ce\nage\uff1a19\njob\uff1a\u5927\u5b66\u751f<\/code><\/pre><\/div>\n\n\n\n<p>\u7d50\u679c\u3092\u898b\u308b\u3068\u3001\u5909\u6570\u306b\u4ee3\u5165\u3055\u308c\u308b\u5024\u304c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5185\u306e\u30ad\u30fc\u3068\u306a\u3063\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__6_2\" class=\"wp-block-heading\">for\u6587\u3084for &#8230; of\u3068\u306e\u9055\u3044\u306b\u6ce8\u610f<\/h3>\n\n\n\n<p>for \u2026in\u6587\u306f\u3001\u57fa\u672c\u7684\u306b\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6271\u3046\u4e0a\u3067\u4f7f\u7528\u3059\u308b\u69cb\u6587\u3067\u3059\u304c\u3001\u4ed5\u69d8\u4e0a\u306f\u914d\u5217\u306b\u3082\u9069\u7528\u53ef\u80fd\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<br>\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u914d\u5217\u306b\u5bfe\u3057\u3066 for \u2026in\u6587\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306f\u3001\u3042\u307e\u308a\u304a\u52e7\u3081\u3067\u304d\u306a\u3044\u65b9\u6cd5\u3067\u3042\u308b\u3068\u8a00\u3048\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u7406\u7531\u3068\u3057\u3066\u3001for\u6587\u3084 for &#8230; of\u6587\u3068\u7570\u306a\u308b\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>prototype\u3067\u62e1\u5f35\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u3082\u4e00\u7dd2\u306b\u53d6\u5f97\u3057\u3066\u3057\u307e\u3046<\/li>\n\n\n\n<li>\u51e6\u7406\u306e\u9806\u5e8f\u304c\u4fdd\u8a3c\u3055\u308c\u3066\u3044\u306a\u3044<\/li>\n\n\n\n<li>\u5909\u6570\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u304c\u683c\u7d0d\u3055\u308c\u308b\u305f\u3081\u3001\u30b3\u30fc\u30c9\u304c\u5d69\u5f35\u308a\u3084\u3059\u3044<\/li>\n<\/ul>\n\n\n\n<p>\u7279\u306b\u3001\uff11\u3064\u76ee\u306b\u3042\u3052\u305f\u30e1\u30bd\u30c3\u30c9\u306e\u4ef6\u306b\u3064\u3044\u3066\u306f\u3001\u914d\u5217\u306b\u9650\u3089\u305a\u8d77\u3053\u308a\u5f97\u308b\u554f\u984c\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u898b\u3066\u307f\u3066\u304f\u3060\u3055\u3044\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 sampleObject = { \n    name: &#39;\u5c71\u7530\u592a\u90ce&#39;, \n    age: 19, \n    job: &#39;\u5927\u5b66\u751f&#39;\n}\n\nObject.prototype.hoge = function() {};\n\nfor (let key in sampleObject) {\n   console.log(key + &#39;\uff1a&#39; + sampleObject[key])\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>name\uff1a\u5c71\u7530\u592a\u90ce\nage\uff1a19\njob\uff1a\u5927\u5b66\u751f\nhoge\uff1afunction() {}<\/code><\/pre><\/div>\n\n\n\n<p>\u7d50\u679c\u3092\u898b\u308b\u3068\u3001\u5143\u3005\u683c\u7d0d\u3055\u308c\u3066\u3044\u305f\u8981\u7d20\u3060\u3051\u3067\u306a\u304f\u3001\u62e1\u5f35\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u307e\u3067\u4e00\u7dd2\u306b\u53d6\u5f97\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002<br>\u3053\u306e\u3088\u3046\u306b\u3001\u672c\u6765\u5fc5\u8981\u306e\u306a\u3044\u60c5\u5831\u307e\u3067\u53d6\u5f97\u3057\u3066\u3057\u307e\u3046\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u57fa\u672c\u7684\u306b\u306f\u4ed6\u306e\u4f7f\u7528\u53ef\u80fd\u306a\u65b9\u6cd5\u3067\u4ee3\u66ff\u3059\u308b\u306e\u304c\u671b\u307e\u3057\u3044\u3067\u3059\u304c\u3001for &#8230; in\u6587\u3092\u4f7f\u7528\u3057\u305f\u4e0a\u3067\u4e0a\u8a18\u3092\u56de\u907f\u3057\u305f\u3044\u5834\u5408\u306f\u3001hasOwnProperty\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\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 sampleObject = { \n    name: &#39;\u5c71\u7530\u592a\u90ce&#39;, \n    age: 19, \n    job: &#39;\u5927\u5b66\u751f&#39;\n}\n\nObject.prototype.hoge = function() {};\n\nfor (let key in sampleObject) {\n   if(sampleDict.hasOwnProperty(key)) {\n       console.log(key + &#39;\uff1a&#39; + sampleObject[key])\n   }\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>name\uff1a\u5c71\u7530\u592a\u90ce\nage\uff1a19\njob\uff1a\u5927\u5b66\u751f<\/code><\/pre><\/div>\n\n\n\n<h2 id=\"outline__7\" class=\"wp-block-heading\">\u305d\u306e\u4ed6\u306eJavaScript\u3067\u306e\u30eb\u30fc\u30d7\u51e6\u7406<\/h2>\n\n\n\n<p>\u4e0a\u8a18\u3067\u7d39\u4ecb\u3057\u305f3\u3064\u306e\u65b9\u6cd5\u306e\u4ed6\u306b\u3082\u3001\u30eb\u30fc\u30d7\u51e6\u7406\u306e\u5b9f\u88c5\u306b\u4f7f\u7528\u3067\u304d\u308b\u65b9\u6cd5\u304c\u5b58\u5728\u3057\u307e\u3059\u3002<br>\u305d\u308c\u305e\u308c\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 id=\"outline__7_1\" class=\"wp-block-heading\">forEach\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u308b\u914d\u5217\u306e\u30eb\u30fc\u30d7\u51e6\u7406<\/h3>\n\n\n\n<p>\u5b9f\u88c5\u53ef\u80fd\u306a\u65b9\u6cd5\u306e\uff11\u3064\u76ee\u306f\u3001forEach\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002<br>forEach\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u57fa\u672c\u69cb\u6587\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\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>array.forEach(\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570)<\/code><\/pre><\/div>\n\n\n\n<p>\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306e\u5f15\u6570\u306b\u914d\u5217\u306e\u5404\u8981\u7d20\u304c\u683c\u7d0d\u3055\u308c\u308b\u305f\u3081\u3001for \u2026of\u6587\u3068\u4f3c\u305f\u3088\u3046\u306a\u5f62\u5f0f\u3067\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u5b9f\u969b\u306e\u52d5\u304d\u3092\u78ba\u8a8d\u3057\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 = [1, 2, 3, 4, 5];\n\nsampleArray.forEach(function(value) {\n    console.log(value);\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\n4\n5<\/code><\/pre><\/div>\n\n\n\n<p>forEach\u6587\u306e\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306f\u30013\u3064\u306e\u5f15\u6570\u3092\u53d7\u3051\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u300cvalue\u300d\uff1a\u914d\u5217\u30c7\u30fc\u30bf\u306e\u5024<\/li>\n\n\n\n<li>\u300cindex\u300d\uff1a\u914d\u5217\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7<\/li>\n\n\n\n<li>\u300carray\u300d\uff1a\u73fe\u5728\u51e6\u7406\u3057\u3066\u3044\u308b\u914d\u5217<\/li>\n<\/ul>\n\n\n\n<p>\u307e\u305f\u3001forEach\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u6ce8\u610f\u70b9\u3068\u3057\u3066\u3001\u3042\u304f\u307e\u3067\u5236\u5fa1\u6587\u3067\u306f\u306a\u304f\u30e1\u30bd\u30c3\u30c9\u306e\u305f\u3081\u3001continue\u6587\u3084 break\u6587\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>\u51e6\u7406\u306e\u30b9\u30ad\u30c3\u30d7\u3084\u4e2d\u65ad\u3092\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306b\u306f\u3001for \u2026 of\u6587\u3092\u4ee3\u308f\u308a\u306b\u4f7f\u7528\u3059\u308b\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>forEach\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u306f\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002\u305c\u3072\u3053\u3061\u3089\u3082\u4f75\u305b\u3066\u3054\u4e00\u8aad\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-techmania wp-block-embed-techmania\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"BU2MtL4MNE\"><a href=\"https:\/\/techmania.jp\/blog\/javascript-foreach\/\">\u3010JavaScript\u5165\u9580\u3011forEach\u30e1\u30bd\u30c3\u30c9\u3067\u914d\u5217\u306e\u5404\u8981\u7d20\u306b\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3059\uff01\u4f7f\u3044\u65b9\u304b\u3089\u6ce8\u610f\u70b9\u307e\u3067\u5fb9\u5e95\u89e3\u8aac<\/a><\/blockquote><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;\u3010JavaScript\u5165\u9580\u3011forEach\u30e1\u30bd\u30c3\u30c9\u3067\u914d\u5217\u306e\u5404\u8981\u7d20\u306b\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3059\uff01\u4f7f\u3044\u65b9\u304b\u3089\u6ce8\u610f\u70b9\u307e\u3067\u5fb9\u5e95\u89e3\u8aac&#8221; &#8212; TechMania\" src=\"https:\/\/techmania.jp\/blog\/javascript-foreach\/embed\/#?secret=YRnoSCPTYh#?secret=BU2MtL4MNE\" data-secret=\"BU2MtL4MNE\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<h3 id=\"outline__7_2\" class=\"wp-block-heading\">while\u6587\u306b\u3088\u308b\u30eb\u30fc\u30d7\u51e6\u7406<\/h3>\n\n\n\n<p>\u5b9f\u88c5\u53ef\u80fd\u306a\u3082\u3046\uff11\u3064\u306e\u65b9\u6cd5\u306f\u3001while\u6587\u3092\u4f7f\u7528\u3059\u308b\u8a18\u8ff0\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u5192\u982d\u3067\u3082\u89e3\u8aac\u3057\u305f\u3088\u3046\u306b\u3001for\u6587\u304c\u4efb\u610f\u306e\u56de\u6570\u5206\u3060\u3051\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u884c\u3046\u69cb\u6587\u3067\u3042\u308b\u306e\u306b\u5bfe\u3057\u3001while\u6587\u306f\u30eb\u30fc\u30d7\u56de\u6570\u3092\u660e\u78ba\u306b\u5b9a\u3081\u306a\u3044\u51e6\u7406\u3067\u306e\u4f7f\u7528\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>while\u6587\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u57fa\u672c\u69cb\u6587\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\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>while(\u6761\u4ef6\u5f0f) {\n   \/\/ \u7e70\u308a\u8fd4\u3057\u305f\u3044\u51e6\u7406\u5185\u5bb9\n}<\/code><\/pre><\/div>\n\n\n\n<p>while\u6587\u306b\u306f\u3001\u30ab\u30a6\u30f3\u30bf\u30fc\u5909\u6570\u3084\u8981\u7d20\u3092\u81ea\u52d5\u3067\u683c\u7d0d\u3059\u308b\u305f\u3081\u306e\u5909\u6570\u306a\u3069\u306f\u5b58\u5728\u3057\u306a\u3044\u305f\u3081\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30d6\u30ed\u30c3\u30af\u5185\u3067\u30b3\u30fc\u30c9\u3092\u8a18\u8ff0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\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 = [10, 2, 23, 26, 37, 15];\n\nlet count = 0;\nlet value = 0;\n\nwhile(value &lt; 30) {\n    value = sampleArray[count];\n    count++;\n    console.log(count + &#39;\u56de\u76ee\uff1a&#39; + value);\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\u56de\u76ee\uff1a10\n2\u56de\u76ee\uff1a2\n3\u56de\u76ee\uff1a23\n4\u56de\u76ee\uff1a26\n5\u56de\u76ee\uff1a37<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u306f\u3001\u914d\u5217\u306e\u8981\u7d20\u306e\u4e2d\u304b\u3089\u6570\u5024\u304c 30 \u3092\u8d85\u3048\u308b\u8981\u7d20\u304c\u73fe\u308c\u308b\u307e\u3067\u3001\u56de\u6570\u306b\u5236\u9650\u306a\u304f\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u884c\u3046\u30b3\u30fc\u30c9\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>while\u6587\u3092\u4f7f\u7528\u3059\u308b\u30b1\u30fc\u30b9\u3067\u306f\u3001\u30eb\u30fc\u30d7\u56de\u6570\u3092\u660e\u78ba\u306b\u5b9a\u3081\u305a\u51e6\u7406\u3059\u308b\u5834\u5408\u304c\u591a\u3044\u305f\u3081\u3001\u6761\u4ef6\u5f0f\u306e\u5185\u5bb9\u3092\u9593\u9055\u3048\u3066\u3057\u307e\u3046\u3068\u6c38\u9060\u306b\u30eb\u30fc\u30d7\u51e6\u7406\u304c\u7d9a\u3044\u3066\u3057\u307e\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<br>\u4f7f\u7528\u306e\u969b\u306b\u306f\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 id=\"outline__8\" class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u4eca\u56de\u306f\u3001JavaScript\u3067\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u304d\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u69d8\u3005\u306a\u5b9f\u88c5\u65b9\u6cd5\u304c\u3042\u308b\u305f\u3081\u4e00\u5ea6\u306b\u5168\u3066\u899a\u3048\u308b\u306e\u306f\u5927\u5909\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u3044\u305a\u308c\u3082\u4f7f\u3046\u6a5f\u4f1a\u306e\u591a\u3044\u65b9\u6cd5\u3067\u3059\u3002<br>\u305c\u3072\u4f7f\u3044\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<h2 id=\"outline__9\" class=\"wp-block-heading\">\u95a2\u9023\u8a18\u4e8b<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/techmania.jp\/blog\/javascript0001\/\">JavaScript\u3068\u306f\uff1f\u521d\u5fc3\u8005\u5411\u3051\u306b\u3067\u304d\u308b\u3053\u3068\u3084\u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9\u3092\u89e3\u8aac<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/techmania.jp\/blog\/javascript0002\/\">JavaScript\u304c\u521d\u5fc3\u8005\u306b\u304a\u30b9\u30b9\u30e1\u306a\u7406\u7531\u3092\u73fe\u5f79\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u304c\u89e3\u8aac<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/techmania.jp\/blog\/programming0012\/\">\u3010JavaScript\u5165\u9580\u3011\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u3066\u7fd2\u5f97<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/techmania.jp\/blog\/javascript-getelementbyid\/\">\u3010JavaScript\u5165\u9580\u3011getElementById\u306e\u4f7f\u3044\u65b9\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u5fb9\u5e95\u89e3\u8aac<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/techmania.jp\/blog\/javascript-foreach\/\">\u3010JavaScript\u5165\u9580\u3011forEach\u30e1\u30bd\u30c3\u30c9\u3067\u914d\u5217\u306e\u5404\u8981\u7d20\u306b\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3059\uff01\u4f7f\u3044\u65b9\u304b\u3089\u6ce8\u610f\u70b9\u307e\u3067\u5fb9\u5e95\u89e3\u8aac<\/a><\/li>\n<\/ul>\n\n\n\n<h2 id=\"outline__10\" 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 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