{"id":20777,"date":"2017-04-03T19:12:37","date_gmt":"2017-04-03T10:12:37","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=20777"},"modified":"2025-12-29T17:10:40","modified_gmt":"2025-12-29T08:10:40","slug":"%e3%80%90javascript%e5%85%a5%e9%96%80%e3%80%91%e3%80%8cfor%e6%96%87%e3%80%8d%e3%83%9e%e3%82%b9%e3%82%bf%e3%83%bc%e3%81%ab%e3%81%aa%e3%82%8b%e3%81%9f%e3%82%81%e3%81%ae%e5%ae%9f%e8%b7%b5%e3%83%81","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/20777","title":{"rendered":"\u3010JavaScript\u5165\u9580\u3011for\u6587\u306e\u30eb\u30fc\u30d7\u51e6\u7406\u306f\u3053\u308c\u3067\u5b8c\u74a7! for-in \/ for-of \/ forEach\u6587\u3082\u5fb9\u5e95\u89e3\u8aac\uff01"},"content":{"rendered":"\n<p>JavaScript\u3067\u540c\u3058\u3088\u3046\u306a\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3057\u305f\u3044\u6642\u3063\u3066\u3042\u308a\u307e\u3059\u3088\u306d\u3002\u305d\u306e\u305f\u3081\u306b\u540c\u3058\u30b3\u30fc\u30c9\u3092\u7e70\u308a\u8fd4\u3057\u66f8\u304f\u306e\u306f\u3001\u898b\u6804\u3048\u7684\u306b\u3082\u4f7f\u3044\u52dd\u624b\u7684\u306b\u3082\u306a\u304b\u306a\u304b\u30ca\u30f3\u30bb\u30f3\u30b9\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u306a\u305c\u306a\u3089\u3001JavaScript\u306a\u3069\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u306f\u540c\u3058\u30b3\u30fc\u30c9\u3092\u7e70\u308a\u8fd4\u3059\u51e6\u7406\u3092\u66f8\u304f\u69cb\u6587\u304c\u3042\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4eca\u56de\u306f\u3001JavaScript\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3067\u3088\u304f\u4f7f\u308f\u308c\u308bfor\u6587\u306a\u3069\u3092\u5fb9\u5e95\u89e3\u8aac\uff01<\/p>\n\n\n<div class=\"box01\">\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>\u3010\u57fa\u790e\u3011\u30eb\u30fc\u30d7\u51e6\u7406\u3068\u306f\uff1f<\/b><\/li>\n\n\n\n<li><b>\u3010\u57fa\u790e\u3011for\u6587\u306e\u4f7f\u3044\u65b9\u3084\u5b9f\u8df5\u4f8b<\/b><\/li>\n\n\n\n<li><b>\u3010\u5b9f\u8df5\u3011for-in\u6587\u306e\u4f7f\u3044\u65b9\u3084\u5b9f\u8df5\u4f8b<\/b><\/li>\n\n\n\n<li><b>\u3010\u5b9f\u8df5\u3011for-of\u6587\u306e\u4f7f\u3044\u65b9\u3084\u5b9f\u8df5\u4f8b<\/b><\/li>\n\n\n\n<li><b>\u3010\u5b9f\u8df5\u3011forEach\u6587\u306e\u4f7f\u3044\u65b9\u3084\u5b9f\u8df5\u4f8b<\/b><\/li>\n\n\n\n<li><b>\u3010\u307e\u3068\u3081\u3011for\u6587\u306e\u4f7f\u3044\u65b9\u307e\u3068\u3081<\/b><\/li>\n<\/ul>\n\n\n<\/div>\n\n\n\n<p>\u3068\u3044\u3046\u6d41\u308c\u3067\u3001for\u6587\u306e\u57fa\u790e\u304b\u3089\u305d\u306e\u4ed6\u306e\u30eb\u30fc\u30d7\u51e6\u7406\u65b9\u6cd5\u307e\u3067\u3001\u8a73\u3057\u3044\u89e3\u8aac\u3084\u5b9f\u8df5\u7684\u306a\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u5404\u7ae0\u306e\u6700\u5f8c\u306b\u306f\u7406\u89e3\u5ea6\u3092\u30c1\u30a7\u30c3\u30af\u3067\u304d\u308b\u30df\u30cb\u30c6\u30b9\u30c8\u3082\u7528\u610f\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u3055\u3089\u306a\u308b\u7406\u89e3\u3092\u6df1\u3081\u308b\u305f\u3081\u306b\u305c\u3072\u6311\u6226\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n\n<p>\uff1e\uff1e\uff1e <a href=\"https:\/\/www.sejuku.net\/blog\/20777#for-4\">\u4eca\u3059\u3050\u300cfor\u306e\u4f7f\u3044\u65b9\u300d\u3092\u77e5\u308a\u305f\u3044\u65b9\u306f\u3053\u3061\u3089<\/a><\/p>\n\n\n\n<p class=\"u-mb-ctrl u-mb-10\">\u300c\u72ec\u5b66\u3068\u4e26\u884c\u3057\u306a\u304c\u3089\u3001\u526f\u696d\u3067\u7a3c\u3052\u308b\u3088\u3046\u306b\u306a\u308c\u308b\u304b\u306a&#8230;\u300d<\/p>\n\n<p class=\"u-mb-ctrl u-mb-10\">\u305d\u3093\u306a\u4e0d\u5b89\u3092\u62b1\u3048\u3066\u3044\u308b\u4eba\u306f\u3001\u305c\u3072\u300c<strong><a href=\"https:\/\/lp.sejuku.net\/lp1_blog_02\/?cid=lp_text_cta\">\u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2<\/a><\/strong>\u300d\u3092\u304a\u8a66\u3057\u304f\u3060\u3055\u3044\u3002<\/p>\n\n<p class=\"u-mb-ctrl u-mb-10\">\u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u3067\u306f\u73fe\u5f79\u30a8\u30f3\u30b8\u30cb\u30a2\u3068\u5b66\u7fd2\u30b3\u30fc\u30c1\u306e<strong><span class=\"swl-marker mark_yellow\">2\u540d\u4f53\u5236\u3067<\/span><\/strong>\u5b66\u7fd2\u3092\u30b5\u30dd\u30fc\u30c8\u3002\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u652f\u63f4\u3092\u53d7\u3051\u306a\u304c\u3089\u3001\u5b9f\u969b\u306e\u526f\u696d\u6848\u4ef6\u306b\u3082\u6311\u6226\u3067\u304d\u307e\u3059\u3002<\/p>\n\n<p class=\"u-mb-ctrl u-mb-10\">\u3053\u308c\u307e\u3067<strong><span class=\"swl-marker mark_yellow\">4\u4e075,000\u540d\u4ee5\u4e0a<\/span><\/strong><span class=\"swl-marker mark_yellow\">\u306e<\/span>\u53d7\u8b1b\u751f\u3092\u6307\u5c0e\u3057\u3066\u304d\u305f\u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u306a\u3089\u3001\u672a\u7d4c\u9a13\u304b\u3089\u3067\u3082\u632b\u6298\u306a\u304f\u526f\u696d\u3067\u306e\u53ce\u5165\u7372\u5f97\u306b\u76f4\u7d50\u3059\u308b\u30b9\u30ad\u30eb\u304c\u8eab\u306b\u3064\u3051\u3089\u308c\u307e\u3059\u3088\u3002<\/p>\n\n<p class=\"has-text-align-center u-mb-ctrl u-mb-0\">\uff3c \u7d66\u4ed8\u91d1\u3067\u53d7\u8b1b\u6599\u304c\u6700\u592780%OFF \uff0f<a href=\"https:\/\/lp.sejuku.net\/lp1_blog_02?cid=pro_howto_normal_pr_Normal_sbid-3286\"><\/a><\/p>\n\n<div class=\"swell-block-button is-style-btn_shiny\" data-id=\"2b3d06a9\"><a href=\"https:\/\/lp.sejuku.net\/lp1_blog_02\/?cid=lp_text_cta\" class=\"swell-block-button__link\"><span>\u516c\u5f0f\u30b5\u30a4\u30c8\u3067\u8a73\u7d30\u3092\u898b\u308b<\/span><\/a><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">for\u6587\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3068\u306f\uff1f<\/h2>\n\n\n\n<p>JavaScript\u306b\u95a2\u308f\u3089\u305a\u3001\u540c\u3058\u51e6\u7406\u3092\u4f55\u56de\u304b\u7e70\u308a\u8fd4\u3057\u305f\u3044\u5834\u9762\u3068\u3044\u3046\u306e\u304c\u3042\u3063\u305f\u308a\u3059\u308b\u3068\u601d\u3044\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u53d6\u5f97\u3057\u305f\u5024\u306e\u5206\u7e70\u308a\u8fd4\u3057\u3066\u30ea\u30b9\u30c8\u3092\u751f\u6210\u3057\u305f\u308a\u2026\u3068\u3044\u3046\u5834\u9762\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<p>\u305d\u3093\u306a\u6642\u306b\u4f7f\u3048\u308b\u306e\u304c\u3001\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u4f7f\u3048\u3070\u3001\u540c\u3058\u30b3\u30fc\u30c9\u3092\u6570\u56de\u7e70\u308a\u8fd4\u3057\u3066\u5b9f\u884c\u3057\u3066\u304f\u308c\u307e\u3059\u3002\u30d6\u30ed\u30b0\u306e\u4e00\u89a7\u3092\u4f5c\u308b\u6642\u306a\u3093\u304b\u306b\u3082\u4f7f\u308f\u308c\u308b\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u5b9f\u73fe\u3067\u304d\u308b\u306e\u304c\u3001for\u306a\u3069\u306e\u69cb\u6587\u3067\u3059\u3002\u3053\u306e\u5f8c\u306e\u9805\u76ee\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">for\u6587\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<p>\u307e\u305a\u306f\u3001JavaScript\u306b\u304a\u3051\u308b\u6700\u3082\u57fa\u672c\u3068\u306a\u308bfor\u6587\u306e\u4f7f\u3044\u65b9\u304b\u3089\u5b66\u3093\u3067\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<p>for\u6587\u306f\u3001<b>\u6c7a\u3081\u3089\u308c\u305f\u56de\u6570\u3060\u3051\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3059<\/b>\u5834\u5408\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002\u4e8b\u524d\u306b\u3069\u3093\u306a\u51e6\u7406\u3092\u4f55\u56de\u7e70\u308a\u8fd4\u3059\u306e\u304b\u3092\u6c7a\u3081\u3066\u304a\u304f\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306efor\u6587\u306b\u3088\u304f\u4f3c\u305f\u69cb\u6587\u3068\u3057\u3066while\u6587\u3068\u3044\u3046\u306e\u3082\u3042\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u3053\u3061\u3089\u306f\u3001<b>\u7e70\u308a\u8fd4\u3059\u56de\u6570\u304c\u6c7a\u307e\u3063\u3066\u3044\u306a\u3044\u6642\u306b\u4f7f\u308f\u308c\u308b<\/b>\u306e\u3067\u6df7\u4e71\u3057\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>\u305d\u308c\u3067\u306f\u3001for\u6587\u306e\u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9\u304b\u3089\u5b66\u7fd2\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<p>for\u6587\u306e\u57fa\u672c\u5f62\u306f\u4e0b\u8a18\u306e\u3088\u3046\u306a\u611f\u3058\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">for (  \u521d\u671f\u5024;  \u6761\u4ef6\u5f0f;  \u5897\u6e1b\u5024  ) {\n\n  \/\/ \u7e70\u308a\u8fd4\u3059\u51e6\u7406\u3092\u66f8\u304f\n\n}\n<\/pre>\n\n\n\n<p>for\u6587\u306f\u3001<b>3\u3064\u306e\u5f15\u6570<\/b>\u3092\u4e0e\u3048\u3066\u3042\u3052\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u308c\u305e\u308c\u306e\u610f\u5473\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<p><div class=\"box01\">\u521d\u671f\u5024\uff1a\u7e70\u308a\u8fd4\u3059\u56de\u6570\u306e\u521d\u671f\u5024<br>\u6761\u4ef6\u5f0f\uff1a\u7e70\u308a\u8fd4\u3057\u3092\u7d99\u7d9a\u3059\u308b\u6761\u4ef6<br>\u5897\u6e1b\u5024\uff1a\u300c\u521d\u671f\u5024\u300d\u3092\u5897\u6e1b\u3059\u308b\u5f0f<\/div><\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u3001\u4f55\u3089\u304b\u306e\u51e6\u7406\u309210\u56de\u7e70\u308a\u8fd4\u3059\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u3063\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">for (  var i = 0;  i &lt; 10;  i++  ) {\n\n \/\/ \u7e70\u308a\u8fd4\u3057\u51e6\u7406\n\n}\n<\/pre>\n\n\n\n<p>\u5148\u307b\u3069\u306e\u5404\u9805\u76ee\u306b\u5f53\u3066\u306f\u3081\u308b\u3068\u3001\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u521d\u671f\u5024\uff1avar i = 0;<br>\u6761\u4ef6\u5f0f\uff1ai &lt; 10;<br>\u5897\u6e1b\u5024\uff1ai++;<\/p>\n\n\n\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u521d\u671f\u5024\u300ci\u300d\u306b0\u3092\u4ee3\u5165\u3057\u3001\u6761\u4ef6\u5f0f\u3068\u306a\u308b\u300ci &lt; 10\u300d\u304c\u6210\u7acb(true)\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u305d\u306e\u307e\u307e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u3057\u3066\u3001\u5897\u6e1b\u5024\u306e\u5f0f\u306b\u3042\u308b\u3088\u3046\u306b\u521d\u671f\u5024\u300ci\u300d\u3092\u52a0\u7b97\u3057\u3001\u6761\u4ef6\u5f0f\u304c\u6210\u7acb\u3057\u306a\u304f\u306a\u308b(false)\u307e\u3067\u7e70\u308a\u8fd4\u3057\u3066\u3044\u304f\u306e\u304cfor\u6587\u306b\u306a\u308b\u308f\u3051\u3067\u3059\uff01<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u914d\u5217\u3092\u4f7f\u3063\u305f\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u4f5c\u3063\u3066\u307f\u3088\u3046<\/h3>\n\n\n\n<p>\u57fa\u672c\u3092\u6291\u3048\u305f\u3068\u3053\u308d\u3067\u3001\u4eca\u5ea6\u306f\u914d\u5217\u3092\u4f7f\u3063\u305f\u7e70\u308a\u8fd4\u3057\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<p>\u307e\u305a\u6700\u521d\u306b\u3001for\u6587\u3092\u4f7f\u308f\u306a\u3044\u3067\u914d\u5217\u306e\u8981\u7d20\u3092\u3059\u3079\u3066\u8868\u793a\u3059\u308b\u4f8b\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var lists = ['\u4f50\u85e4', '\u4f0a\u85e4', '\u9234\u6728', '\u6728\u6751', '\u7530\u4e2d', '\u9ad8\u6a4b'];\n\nconsole.log ( lists[0] );\nconsole.log ( lists[1] );\nconsole.log ( lists[2] );\nconsole.log ( lists[3] );\nconsole.log ( lists[4] );\nconsole.log ( lists[5] );\n<\/pre>\n\n\n\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u4f50\u85e4\n\u4f0a\u85e4\n\u9234\u6728\n\u6728\u6751\n\u7530\u4e2d\n\u9ad8\u6a4b<\/pre>\n\n\n\n<p>console.log()\u3092\u4f7f\u3063\u3066\u8868\u793a\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u540c\u3058\u51e6\u7406\u30926\u56de\u3082\u7e70\u308a\u8fd4\u3057\u3066\u3044\u308b\u306e\u3067\u975e\u5e38\u306b\u5358\u8abf\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u304c\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<p>\u6b21\u306b\u3001for\u6587\u3092\u4f7f\u3063\u3066\u66f8\u3044\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var lists = ['\u4f50\u85e4', '\u4f0a\u85e4', '\u9234\u6728', '\u6728\u6751', '\u7530\u4e2d', '\u9ad8\u6a4b'];\n\nfor (  var i = 0;  i &lt; lists.length;  i++  ) {\n\n console.log ( lists[ i ] );\n\n}\n<\/pre>\n\n\n\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u4f50\u85e4\n\u4f0a\u85e4\n\u9234\u6728\n\u6728\u6751\n\u7530\u4e2d\n\u9ad8\u6a4b<\/pre>\n\n\n\n<p>\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u3068\u3066\u3082\u30b9\u30c3\u30ad\u30ea\u3057\u307e\u3057\u305f\u306d\u3002<\/p>\n\n\n\n<p>\u6761\u4ef6\u5f0f\u306e\u3068\u3053\u308d\u3067lists.length\u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u914d\u5217\u306e\u9577\u3055\u3092\u53d6\u5f97\u3067\u304d\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3001\u4eca\u56de\u306e\u5834\u5408\u306f\u300ci &lt; 6\u300d\u3068\u540c\u3058\u610f\u5473\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3042\u3068\u306f\u3001\u5897\u6e1b\u5024\u306e\u5f0f\u306b\u3088\u3063\u3066\u521d\u671f\u5024\u304c1\u3064\u305a\u3064\u52a0\u7b97\u3055\u308c\u3066\u3044\u304f\u306e\u3067\u3001\u300clists[ i ]\u300d\u3068\u66f8\u304f\u3053\u3068\u306b\u3088\u3063\u3066\u9806\u756a\u306b\u914d\u5217\u306e\u30c7\u30fc\u30bf\u3092\u8868\u793a\u3067\u304d\u308b\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u9593\u9055\u3044\u3084\u3059\u3044\u30dd\u30a4\u30f3\u30c8<\/h3>\n\n\n\n<p>for\u6587\u306e\u4fbf\u5229\u306a\u4f7f\u3044\u65b9\u3092\u5b66\u7fd2\u3057\u305f\u3068\u3053\u308d\u3067\u3001\u4eca\u5ea6\u306f\u521d\u5fc3\u8005\u304c\u9665\u308a\u3084\u3059\u3044\u554f\u984c\u70b9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3092\u3057\u3066\u304a\u304d\u307e\u3059\uff01<\/p>\n\n\n\n<p>\u307e\u305a\u306f\u3001\u6b21\u306e\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">for( var i = 0; i &lt; 5; i++ ) {\n\n  console.log( i );\n\n}\n\n\/\/for\u6587\u304c\u7d42\u4e86\u3057\u305f\u3042\u3068\u306b\u5909\u6570\u300ci\u300d\u3092\u51fa\u529b\nconsole.log('\u5909\u6570\u300ci\u300d\u306e\u5024\u306f\uff1a' + i);<\/pre>\n\n\n\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">0\n1\n2\n3\n4\n\u5909\u6570\u300ci\u300d\u306e\u5024\u306f\uff1a5<\/pre>\n\n\n\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001for\u6587\u30675\u56de\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u884c\u306a\u3044\u3001\u305d\u306e\u3042\u3068\u306bfor\u6587\u306e\u521d\u671f\u5024\u3067\u3042\u308b\u5909\u6570\u300ci\u300d\u3092\u51fa\u529b\u3057\u3066\u3044\u307e\u3059\u3002\u51fa\u529b\u7d50\u679c\u3092\u898b\u308b\u3068\u308f\u304b\u308b\u3088\u3046\u306b\u3001\u5909\u6570\u300ci\u300d\u306e\u5024\u306f\u300c5\u300d\u3068\u8868\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<p>\u3064\u307e\u308a\u3001JavaScript\u306efor\u6587\u306f\u5b9f\u884c\u304c\u7d42\u4e86\u3057\u305f\u3042\u3068\u3067\u3082\u3001\u521d\u671f\u5024\u3068\u3057\u3066\u4f5c\u6210\u3057\u305f\u5909\u6570\u300ci\u300d\u306f\u5b58\u5728\u3057\u7d9a\u3051\u308b\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u3092\u77e5\u3089\u305a\u306b\u3001\u3046\u3063\u304b\u308a\u5909\u6570\u300ci\u300d\u3092\u5225\u306e\u30b3\u30fc\u30c9\u3067\u6d41\u7528\u3057\u3066\u3057\u307e\u3046\u3068<b>\u610f\u56f3\u3057\u306a\u3044\u52d5\u4f5c\u3092\u5f15\u304d\u8d77\u3053\u3059\u539f\u56e0\u306b\u306a\u308b<\/b>\u306e\u3067\u6ce8\u610f\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7406\u89e3\u5ea6\u30c1\u30a7\u30c3\u30af\uff01<\/h3>\n\n\n\n<p>\u305d\u308c\u3067\u306f\u3001\u57fa\u672c\u7684\u306afor\u6587\u306b\u3064\u3044\u3066\u306e\u7406\u89e3\u304c\u3067\u304d\u3066\u3044\u308b\u304b\u3092\u30df\u30cb\u30c6\u30b9\u30c8\u3067\u30c1\u30a7\u30c3\u30af\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<p>\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n\n<p><iframe width=\"100%\" height=\"500\" src=\"https:\/\/paiza.io\/projects\/e\/pyr0ADW4ISA-3pPylSmuSQ?theme=github\" scrolling=\"no\" seamless=\"seamless\"><\/iframe><\/p>\n\n\n\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u306f\u57fa\u672c\u7684\u306afor\u6587\u306e\u30b3\u30fc\u30c9\u306b\u306a\u3063\u3066\u304a\u308a\u3001\u4e0b\u6bb5\u306e\u51fa\u529b\u7d50\u679c\u306b\u300c0\u301c9\u300d\u307e\u3067\u306e\u6570\u5024\u304c\u8868\u793a\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4e0a\u8a18\u30a8\u30c7\u30a3\u30bf\u306f\u3001\u307f\u306a\u3055\u3093\u306e\u30ad\u30fc\u30dc\u30fc\u30c9\u304b\u3089\u76f4\u63a5\u7de8\u96c6\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u306a\u306e\u3067\u3001\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u6539\u9020\u3057\u306a\u304c\u3089\u6b21\u306e\u30df\u30cb\u30c6\u30b9\u30c8\u306b\u6311\u6226\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n\n<p><div class=\"box01\">\uff1cfor\u6587\u30df\u30cb\u30c6\u30b9\u30c8\uff1e<br>\u2460 0\u301c50\u307e\u3067\u306e\u6570\u5024\u30921\u3064\u305a\u3064\u8db3\u3057\u305f\u5408\u8a08\u5024\u3092\u6c42\u3081\u3066\u304f\u3060\u3055\u3044<\/p>\n\n\n\n<p>\u2461 \u5897\u6e1b\u5024\u306b\u300c&#8211;\u300d\u3092\u4f7f\u3063\u306610\u304b\u30891\u306e\u7bc4\u56f2\u3067\u7e70\u308a\u8fd4\u3057\u305f\u5408\u8a08\u5024\u3092\u6c42\u3081\u3066\u304f\u3060\u3055\u3044<\/p>\n\n\n\n<p>\u2462 0\u301c100\u307e\u3067\u306e\u7bc4\u56f2\u3067\u3001\u300c\u5076\u6570\u300d\u3060\u3051\u3092\u8868\u793a\u3057\u3066\u304f\u3060\u3055\u3044<\/p>\n\n\n\n<p>\u2463 [2, 4, 6, 1, 7]\u306e\u6570\u5024\u304c\u5165\u3063\u305f\u914d\u5217\u3092\u4f5c\u308a\u3001\u305d\u306e\u4e2d\u306b\u3042\u308b\u300c1\u300d\u3068\u300c4\u300d\u3060\u3051\u3092\u8868\u793a\u3057\u3066\u304f\u3060\u3055\u3044<\/div><\/p>\n\n\n\n<p>\u8a2d\u554f\u306e\u56de\u7b54\u306f<a href=\"https:\/\/github.com\/masato99\/basic\/blob\/master\/docs\/for-sample.js\" target=\"_blank\" rel=\"noopener noreferrer\">\u30b3\u30c1\u30e9<\/a>\u304b\u3089\u95b2\u89a7\u3067\u304d\u307e\u3059\uff01<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">for\u6587\u306e\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u9014\u4e2d\u3067\u629c\u3051\u308b<\/h2>\n\n\n\n<p>\u3053\u308c\u307e\u3067\u5b66\u7fd2\u3057\u305ffor\u6587\u306f\u3001\u7e70\u308a\u8fd4\u3057\u306e\u9014\u4e2d\u3067\u51e6\u7406\u3092\u4e2d\u65ad\u3057\u3066\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u629c\u3051\u308b\u3053\u3068\u3082\u53ef\u80fd\u306a\u306e\u3092\u3054\u5b58\u77e5\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n\n\n\n<p>\u7279\u306b\u3001\u30eb\u30fc\u30d7\u51e6\u7406\u5185\u3067\u6761\u4ef6\u5206\u5c90\u3055\u305b\u308b\u3088\u3046\u306a\u30b1\u30fc\u30b9\u3067\u6709\u52b9\u306a\u65b9\u6cd5\u3067\u3001\u4e00\u822c\u7684\u306b\u306fcontinue\u3068break\u3092\u4f7f\u3063\u3066\u51e6\u7406\u3092\u629c\u3051\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u3053\u3067\u3001\u305d\u308c\u305e\u308c\u306e\u8a73\u3057\u3044\u4f7f\u3044\u65b9\u3068\u4f8b\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">continue:\u7279\u5b9a\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u3060\u3051\u51e6\u7406\u3092\u5b9f\u884c<\/h3>\n\n\n\n<p>continue\u3092\u4f7f\u3046\u3068\u3001<b>\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306e\u6700\u4e2d\u306b\u7279\u5b9a\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u3060\u3051\u51e6\u7406\u3092\u5b9f\u884c\u3055\u305b\u306a\u3044\u3088\u3046\u306a\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u304c\u53ef\u80fd<\/b>\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u3001for\u6587\u3092\u4f7f\u3063\u3066\u5947\u6570\u3060\u3051\u3092\u8868\u793a\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\/\/ 10\u56de\u7e70\u308a\u8fd4\u3059\u51e6\u7406\nfor ( var i = 0; i&lt;10; i++ ) {\n\n    \/\/ \u5076\u6570\u306e\u6642(2\u3067\u5272\u308a\u5207\u308c\u308b\u6642)\u3060\u3051\u51e6\u7406\u3092\u884c\u308f\u306a\u3044\n    if( i % 2 === 0 ) continue;\n\n    \/\/ \u30ab\u30a6\u30f3\u30bf\u5909\u6570\u300ci\u300d\u3092\u8868\u793a\n    console.log( i );\n\n}<\/pre>\n\n\n\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">1\n3\n5\n7\n9<\/pre>\n\n\n\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001if\u6587\u3092\u4f7f\u3063\u3066\u5076\u6570\u306e\u6642\u3060\u3051continue\u3092\u5b9f\u884c\u3057\u3001\u305d\u308c\u4ee5\u964d\u306e\u51e6\u7406\u3092\u884c\u308f\u306a\u3044\u307e\u307e\u30ab\u30a6\u30f3\u30bf\u5909\u6570\u300ci\u300d\u3092\u52a0\u7b97\u3059\u308b\u3068\u3044\u3046\u610f\u5473\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3064\u307e\u308a\u3001<b>\u5076\u6570\u306e\u6642\u306f\u51e6\u7406\u3092\u629c\u3051\u308b\u305f\u3081\u51fa\u529b\u306f\u3055\u308c\u306a\u3044<\/b>\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u306b\u3088\u308a\u300110\u56de\u7e70\u308a\u8fd4\u3059\u51e6\u7406\u3067\u3042\u308a\u306a\u304c\u3089\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u4e0b\u3060\u3051\u51e6\u7406\u3092\u884c\u308f\u306a\u3044\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3067\u304d\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">break:\u9014\u4e2d\u3067\u51e6\u7406\u3092\u4e2d\u65ad\u3059\u308b<\/h3>\n\n\n\n<p>\u6b21\u306b\u3001break\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<p>\u3053\u308c\u306f\u3001<b>\u7e70\u308a\u8fd4\u3057\u306e\u9014\u4e2d\u3067\u51e6\u7406\u3092\u4e2d\u65ad\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u304f<\/b>\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u3001for\u6587\u3092\u7121\u9650\u30eb\u30fc\u30d7\u3055\u305b\u3066\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u4e0b\u3067\u51e6\u7406\u3092\u4e2d\u65ad\u3055\u305b\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u3063\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var count = 0;\n\n\/\/ \u7121\u9650\u30eb\u30fc\u30d7\nfor( ; ; ) {\n\n    \/\/ \u5909\u6570\u300ccount\u300d\u304c10\u3088\u308a\u5927\u304d\u304f\u306a\u3063\u305f\u3089\u51e6\u7406\u3092\u4e2d\u65ad\u3059\u308b\n    if( count &gt; 10 ) break;\n\n    console.log( count );\n    count++;\n\n}<\/pre>\n\n\n\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">0\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10<\/pre>\n\n\n\n<p>\u3054\u89a7\u306e\u3088\u3046\u306bfor\u6587\u306f\u4e2d\u8eab\u3092\u7701\u7565\u3057\u3066\u66f8\u304f\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u300cfor(;;)\u300d\u3068\u66f8\u304f\u3068\u7121\u9650\u30eb\u30fc\u30d7\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u305f\u3081\u3001break\u3092\u4f7f\u3063\u3066\u51e6\u7406\u3092\u4e2d\u65ad\u3057\u306a\u3044\u3068\u3044\u3051\u306a\u3044\u306e\u3067\u6761\u4ef6\u5206\u5c90\u306a\u3069\u304c\u5fc5\u9808\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001if\u6587\u3092\u4f7f\u3063\u3066\u300ccount &gt; 10\u300d\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u5834\u5408\u306bbreak\u3092\u4f7f\u3063\u3066\u51e6\u7406\u3092\u4e2d\u65ad\u3055\u305b\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>break\u306e\u3082\u3063\u3068\u8a73\u3057\u3044\u4f7f\u3044\u65b9\u306f\u3001\u4e0b\u8a18\u306e\u8a18\u4e8b\u3067\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u3061\u3089\u3082\u305c\u3072\u78ba\u8a8d\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<p>&gt;&gt;<a href=\"https:\/\/www.sejuku.net\/blog\/48252\" target=\"_blank\" rel=\"noopener noreferrer\">\u51e6\u7406\u3092\u4e2d\u65ad\uff01break\u306e\u4f7f\u3044\u65b9<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">for-in\u6587\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e2d\u8eab\u3092\u7e70\u308a\u8fd4\u3059<\/h2>\n\n\n\n<p>\u57fa\u672c\u7684\u306afor\u6587\u3092\u5b66\u3093\u3060\u3068\u3053\u308d\u3067\u3001\u6b21\u306ffor-in\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<p>\u3053\u308c\u306f\u4e3b\u306b\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e2d\u8eab\u3092\u53d6\u308a\u51fa\u3057\u305f\u3044\u6642\u306b\u3088\u304f\u4f7f\u3046\u65b9\u6cd5\u3067\u3001\u5b9f\u969b\u306eWeb\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3044\u3066\u3082\u975e\u5e38\u306b\u3088\u304f\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305f\u3060\u3057\u3001<b>\u6ce8\u610f\u3059\u308b\u30dd\u30a4\u30f3\u30c8<\/b>\u3082\u3044\u304f\u3064\u304b\u5b58\u5728\u3059\u308b\u306e\u3067\u3001\u305d\u308c\u3089\u3082\u5408\u308f\u305b\u3066\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>for-in\u3092\u4f7f\u3063\u3066\u3001\u4e00\u822c\u7684\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u51e6\u7406\u3059\u308b\u69cb\u6587\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">for( \u5909\u6570 in \u30aa\u30d6\u30b8\u30a7\u30af\u30c8 ) {\n\n   \/\/ \u51e6\u7406\u3092\u66f8\u304f\n\n}<\/pre>\n\n\n\n<p>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089\u53d6\u5f97\u3057\u305f\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u30011\u3064\u305a\u3064\u5909\u6570\u306b\u4ee3\u5165\u3055\u308c\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u53d6\u5f97\u3067\u304d\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u7121\u304f\u306a\u308c\u3070\u81ea\u52d5\u7684\u306b\u51e6\u7406\u3092\u7d42\u4e86\u3059\u308b\u306e\u304cfor-in\u306e\u4e00\u822c\u7684\u306a\u52d5\u4f5c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u8a66\u3057\u306b\u3001\u7c21\u5358\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30921\u3064\u4f5c\u6210\u3057\u3001\u305d\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u3059\u3079\u3066\u8868\u793a\u3055\u305b\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var myName = {\n\n    name: '\u592a\u90ce',\n    age: 20,\n    address: '\u6771\u4eac\u90fd\u6e0b\u8c37\u533a\u25cb\u25cb\u25cb'\n\n}\n\nfor( var item in myName ) {\n  \n    console.log( item );\n  \n}<\/pre>\n\n\n\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">name\nage\naddress<\/pre>\n\n\n\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u300cmyName\u300d\u3068\u3044\u3046\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u308a\u30013\u3064\u3042\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u3059\u3079\u3066\u51fa\u529b\u3057\u3066\u3044\u307e\u3059\u3002for-in\u3067\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u884c\u3046\u3053\u3068\u3067\u3001\u3068\u3066\u3082\u7c21\u5358\u306b\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u5217\u6319\u3067\u304d\u3066\u3044\u308b\u306e\u304c\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<p>\u3082\u3061\u308d\u3093\u3001console.log\u306e\u4e2d\u8eab\u3092\u300cmyName[ item ]\u300d\u3068\u3059\u308c\u3070\u3001<b>\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5024\u3092\u51fa\u529b\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd<\/b>\u3067\u3059\u3002<\/p>\n\n\n\n<p>for-in\u3067\u81ea\u5728\u306b\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u64cd\u4f5c\u3057\u305f\u308a\u3059\u308b\u65b9\u6cd5\u3084\u3001\u3064\u307e\u3065\u304d\u3084\u3059\u3044\u6ce8\u610f\u70b9\u306a\u3069\u306f\u3001\u4e0b\u8a18\u306e\u8a18\u4e8b\u3067\u8a73\u7d30\u306b\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002\u3053\u3061\u3089\u3082\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<p>&gt;&gt;<a href=\"https:\/\/www.sejuku.net\/blog\/20116\" target=\"_blank\" rel=\"noopener noreferrer\">JavaScript\u306efor-in\u6587\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u7e70\u308a\u8fd4\u3057\u3092\u6975\u3081\u308b\uff01<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u610f\u56f3\u3057\u306a\u3044\u52d5\u4f5c\u306b\u6ce8\u610f\uff01<\/h3>\n\n\n\n<p>for-in\u6587\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e2d\u8eab\u3092\u53d6\u5f97\u3059\u308b\u306e\u306b\u4fbf\u5229\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<p>\u3057\u304b\u3057\u6ce8\u610f\u70b9\u3068\u3057\u3066\u3001<b>\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306e\u62e1\u5f35\u306a\u3069\u3067\u8ffd\u52a0\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u3082\u4e00\u7dd2\u306b\u53d6\u5f97\u3057\u3066\u3057\u307e\u3046<\/b>\u6027\u8cea\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u3001\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u62e1\u5f35\u3057\u3066\u300choge\u300d\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u3092\u8ffd\u52a0\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var items = { item1: 100, item2: 200, item3: 300 };\n\n\/\/ \u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u62e1\u5f35\u306b\u3088\u308b\u300choge\u300d\u306e\u8ffd\u52a0\nObject.prototype.hoge = function() {};\n\nfor( var key in items ) {\n\n   \/\/ \u5217\u6319\u53ef\u80fd\u306a\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u8868\u793a\u3059\u308b\n   console.log( key + \u2018: \u2019 + items[key] );\n\n}<\/pre>\n\n\n\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">item1: 100\nitem2: 200\nitem3: 300\nhoge: function () {}<\/pre>\n\n\n\n<p>\u5148\u307b\u3069\u8ffd\u52a0\u3057\u305f\u300choge\u300d\u30e1\u30bd\u30c3\u30c9\u3082\u4e00\u7dd2\u306b\u8868\u793a\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304b\u3089\u3001\u610f\u56f3\u3057\u306a\u3044\u52d5\u4f5c\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u3092\u79d8\u3081\u3066\u3044\u308b\u306e\u304c\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u3092\u56de\u907f\u3059\u308b\u306b\u306f\u3001hasOwnProperty\u3092\u4f7f\u3046\u65b9\u6cd5\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">for( var key in items ) {\n   if( items.hasOwnProperty(key) ) {\n\n       console.log( key + ': ' + items[key] );\n\n   }\n}<\/pre>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3059\u308b\u3068\u3001\u5148\u307b\u3069\u306e\u4f8b\u307f\u305f\u3044\u306b\u9014\u4e2d\u3067\u300choge\u300d\u3092\u8ffd\u52a0\u3057\u305f\u3068\u3057\u3066\u3082<b>\u53c2\u7167\u3055\u308c\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093<\/b>\u3002<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u4ed6\u306b\u3082DOM\u8981\u7d20\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u5f97\u3059\u308b\u969b\u306b\u3082\u540c\u3058\u3088\u3046\u306a\u73fe\u8c61\u304c\u767a\u751f\u3059\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002\u8a73\u3057\u304f\u306f\u4e0b\u8a18\u306e\u8a18\u4e8b\u3092\u53c2\u8003\u306b\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<p>&gt;&gt;<a href=\"https:\/\/www.sejuku.net\/blog\/20116\" target=\"_blank\" rel=\"noopener noreferrer\">JavaScript\u306efor-in\u6587\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u7e70\u308a\u8fd4\u3057\u3092\u6975\u3081\u308b\uff01<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7406\u89e3\u5ea6\u30c1\u30a7\u30c3\u30af\uff01<\/h3>\n\n\n\n<p>\u305d\u308c\u3067\u306f\u3001for-in\u6587\u306e\u4f7f\u3044\u65b9\u304c\u7406\u89e3\u3067\u304d\u3066\u3044\u308b\u304b\u3092\u30df\u30cb\u30c6\u30b9\u30c8\u3067\u30c1\u30a7\u30c3\u30af\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<p>\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u300c\u5024\u300d\u3092\u53d6\u5f97\u3057\u3066\u8868\u793a\u3059\u308b\u57fa\u672c\u7684\u306a\u4e8b\u4f8b\u3067\u3059\u3002<\/p>\n\n\n\n<p><iframe width=\"100%\" height=\"500\" src=\"https:\/\/paiza.io\/projects\/e\/rsfnhSGbx2vPQVD_0zeDNg?theme=github\" scrolling=\"no\" seamless=\"seamless\"><\/iframe><\/p>\n\n\n\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u3092\u30d9\u30fc\u30b9\u306b\u3057\u3066\u3001\u6b21\u306e\u8a2d\u554f\u306b\u6311\u6226\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n\n<p><div class=\"box01\">\uff1cfor-in\u6587\u30df\u30cb\u30c6\u30b9\u30c8\uff1e<br>\u2460 \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u300c&#8217;\u6bcd\u56fd\u8a9e&#8217;: &#8216;\u65e5\u672c\u8a9e&#8217;\u300d\u3092\u8ffd\u52a0\u3057\u3066\u300c\u65e5\u672c\u8a9e\u300d\u3060\u3051\u304c\u8868\u793a\u3055\u308c\u308b\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044<\/p>\n\n\n\n<p>\u2461 \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5024\u3092\u5fc5\u305a\u300c\u9806\u756a\u901a\u308a\u300d\u306b\u3059\u3079\u3066\u8868\u793a\u3059\u308b\u3088\u3046\u306b\u5909\u66f4\u3057\u3066\u304f\u3060\u3055\u3044<\/p>\n\n\n\n<p>\u2462 \u3059\u3079\u3066\u306e\u51fa\u529b\u7d50\u679c\u3092\u300c\u30d7\u30ed\u30d1\u30c6\u30a3\u540d(\u5024)\u300d\u306e\u3088\u3046\u306a\u5f62\u5f0f\u3067\u8868\u793a\u3059\u308b\u3088\u3046\u306b\u5909\u66f4\u3057\u3066\u304f\u3060\u3055\u3044\u3002(\u9806\u756a\u306f\u4e0d\u554f)<br>\u4f8b\uff1aname(\u4f50\u85e4)<\/div><\/p>\n\n\n\n<p>\u8a2d\u554f\u306e\u56de\u7b54\u306f<a href=\"https:\/\/github.com\/masato99\/basic\/blob\/master\/docs\/for-in-sample.js\" target=\"_blank\" rel=\"noopener noreferrer\">\u30b3\u30c1\u30e9<\/a>\u304b\u3089\u95b2\u89a7\u3067\u304d\u307e\u3059\uff01<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">for-of\u6587\u306b\u3088\u308b\u7e70\u308a\u8fd4\u3057\u51e6\u7406<\/h2>\n\n\n\n<p>\u6b21\u306b\u5b66\u7fd2\u3059\u308b\u306e\u306ffor-of\u3067\u3059\uff01<\/p>\n\n\n\n<p>\u3053\u308c\u306f\u3001\u4e3b\u306b\u914d\u5217\u3001\u6587\u5b57\u5217\u3001\u30de\u30c3\u30d7\u3001DOM\u306a\u3069\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306b\u4f7f\u308f\u308c\u3066\u304a\u308a\u3001ECMAScript2015\u304b\u3089\u5c0e\u5165\u3055\u308c\u305f\u6bd4\u8f03\u7684\u65b0\u3057\u3044\u69cb\u6587\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u6307\u5b9a\u3055\u308c\u305f\u914d\u5217\u306e\u4e2d\u8eab\u3092\u53d6\u308a\u51fa\u3057\u306a\u304c\u3089\u3001\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u884c\u306a\u3046\u69cb\u6587\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u8a73\u3057\u3044\u89e3\u8aac\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>\u307e\u305a\u306f\u3001\u914d\u5217\u3092\u4f7f\u3063\u305f\u4e00\u822c\u7684\u306a\u69cb\u6587\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">for ( \u5909\u6570 of \u914d\u5217 ) {\n\n \/\/ \u7e70\u308a\u8fd4\u3057\u306e\u51e6\u7406\u3092\u66f8\u304f\n\n}<\/pre>\n\n\n\n<p>\u898b\u305f\u76ee\u306ffor-in\u3068\u975e\u5e38\u306b\u3088\u304f\u4f3c\u3066\u3044\u307e\u3059\u304c\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306f\u5229\u7528\u51fa\u6765\u306a\u3044\u306e\u3067\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>for-of\u306f\u3001\u914d\u5217\u306e\u300c\u5024\u300d\u304c1\u3064\u305a\u3064\u5909\u6570\u3078\u4ee3\u5165\u3055\u308c\u3066\u3044\u304f\u306e\u3067\u3001\u305d\u308c\u305e\u308c\u306e\u300c\u5024\u300d\u306b\u5bfe\u3057\u3066\u4f55\u3089\u304b\u306e\u51e6\u7406\u3092\u5b9f\u884c\u3067\u304d\u308b\u306e\u304c\u7279\u5fb4\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u8a66\u3057\u306b\u3001\u7c21\u5358\u306a\u30b3\u30fc\u30c9\u4f8b\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\uff01<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var lists = [0, 1, 2, 3, 4, 5];\n\nfor( var item of lists ) {\n  \n  console.log( item );\n  \n}<\/pre>\n\n\n\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">0\n1\n2\n3\n4\n5<\/pre>\n\n\n\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001for-of\u3092\u4f7f\u3063\u3066\u914d\u5217\u306e\u4e2d\u8eab\u3092\u3059\u3079\u3066\u51fa\u529b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5192\u982d\u3067\u3054\u7d39\u4ecb\u3057\u305ffor\u6587\u3067\u3082\u540c\u3058\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001for-of\u306f<b>\u7e70\u308a\u8fd4\u3059\u56de\u6570\u3092\u6307\u5b9a\u3057\u306a\u304f\u3066\u3082\u826f\u3044<\/b>\u306e\u304c\u5927\u304d\u306a\u7279\u5fb4\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u4ed6\u306b\u3082DOM\u8981\u7d20\u306a\u3069\u3055\u307e\u3056\u307e\u306a\u5024\u3092\u53d6\u5f97\u3067\u304d\u308b\u4f8b\u3092\u3001\u6b21\u306e\u8a18\u4e8b\u3067\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n\n<p>&gt;&gt;<a href=\"https:\/\/www.sejuku.net\/blog\/20228\" target=\"_blank\" rel=\"noopener noreferrer\">for\u2013of\u306e\u4f7f\u3044\u65b9\u3068\u9593\u9055\u3044\u3084\u3059\u3044\u30dd\u30a4\u30f3\u30c8\u3092\u5fb9\u5e95\u89e3\u8aac\uff01<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u306b\u6ce8\u610f\uff01<\/h3>\n\n\n\n<p>for-of\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3057\u3066\u4f7f\u304a\u3046\u3068\u3059\u308b\u3068\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3042\u304f\u307e\u3067\u914d\u5217\u3001\u6587\u5b57\u5217\u3001\u30de\u30c3\u30d7\u3001DOM\u306a\u3069\u306b\u9650\u3063\u305f\u3053\u3068\u3067\u3059\u304c\u3001\u3053\u308c\u306b\u6df1\u304f\u95a2\u308f\u3063\u3066\u3044\u308b\u306e\u304c\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u3068\u547c\u3070\u308c\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u3001\u307e\u305a\u306f\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var items = [ ];\n\nconsole.log( items );<\/pre>\n\n\n\n<p>\u7a7a\u306e\u914d\u5217\u3092\u4f5c\u308a\u3001\u305d\u308c\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u30ed\u30b0\u306b\u51fa\u529b\u3059\u308b\u3060\u3051\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u3057\u3066\u3001\u51fa\u529b\u7d50\u679c\u306b\u306f\u7d99\u627f\u306b\u3088\u3063\u3066\u300c__proto__\u300d\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u8868\u793a\u3055\u308c\u3066\u304a\u308a\u3001\u3053\u308c\u3092\u5c55\u958b\u3057\u305f\u6642\u306b\u78ba\u8a8d\u3067\u304d\u308b\u306e\u304c\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u3092\u6301\u3064\u30aa\u30d6\u30b8\u30a7\u30af\u30c8(\u30a4\u30c6\u30e9\u30d6\u30eb\u30fb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8)\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" width=\"800\" height=\"400\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/04\/javascript-for-tutorial-01.jpg\" alt=\"javascript-for-tutorial-01\" class=\"wp-image-20782\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/04\/javascript-for-tutorial-01.jpg 800w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/04\/javascript-for-tutorial-01-150x75.jpg 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/04\/javascript-for-tutorial-01-300x150.jpg 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/04\/javascript-for-tutorial-01-640x320.jpg 640w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n\n\n\n\n<p>\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u306f\u3001<b>\u5024\u3092\u9806\u756a\u306b\u53d6\u308a\u51fa\u3059\u4ed5\u7d44\u307f\u3092\u5099\u3048\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/b>\u3067\u3059\u3002\u3053\u308c\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067for-of\u306f\u52d5\u4f5c\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3064\u307e\u308a\u3001\u901a\u5e38\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306f\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u304c\u5b58\u5728\u3057\u3066\u304a\u3089\u305a\u3001\u914d\u5217\u3001\u6587\u5b57\u5217\u3001DOM\u306a\u3069\u306f\u4e8b\u524d\u306b\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u304c\u7d99\u627f\u3055\u308c\u3066\u4f7f\u3048\u308b\u72b6\u614b\u3067\u3042\u308b\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<p>for-of\u306e\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc(\u30a4\u30c6\u30e9\u30eb\u30fb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8)\u306b\u95a2\u3057\u3066\u306f\u3001\u4e0b\u8a18\u306e\u8a18\u4e8b\u3067\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3068\u5171\u306b\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n\n<p>&gt;&gt;<a href=\"https:\/\/www.sejuku.net\/blog\/20228\" target=\"_blank\" rel=\"noopener noreferrer\">for\u2013of\u306e\u4f7f\u3044\u65b9\u3068\u9593\u9055\u3044\u3084\u3059\u3044\u30dd\u30a4\u30f3\u30c8\u3092\u5fb9\u5e95\u89e3\u8aac\uff01<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7406\u89e3\u5ea6\u30c1\u30a7\u30c3\u30af\uff01<\/h3>\n\n\n\n<p>\u305d\u308c\u3067\u306f\u3001for-of\u6587\u306e\u7406\u89e3\u5ea6\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u305f\u3081\u3001\u30df\u30cb\u30c6\u30b9\u30c8\u306b\u6311\u6226\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<p>\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306f\u3001\u914d\u5217\u306b\u683c\u7d0d\u3055\u308c\u305f\u679c\u7269\u306e\u540d\u79f0\u3092\u3001\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u3059\u3079\u3066\u51fa\u529b\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3059\u3002<\/p>\n\n\n\n<p><iframe width=\"100%\" height=\"500\" src=\"https:\/\/paiza.io\/projects\/e\/GFdo6zOhD5z221CFADyrPA?theme=github\" scrolling=\"no\" seamless=\"seamless\"><\/iframe><\/p>\n\n\n\n<p>\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u30d9\u30fc\u30b9\u306b\u3057\u3066\u3001\u6b21\u306e\u8a2d\u554f\u306b\u7b54\u3048\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n\n<p><div class=\"box01\">\uff1cfor-of\u6587\u30df\u30cb\u30c6\u30b9\u30c8\uff1e<br>\u2460 \u914d\u5217\u300carry\u300d\u3092\u4f5c\u308a\u3001[3, 5, 1, 7, 8]\u3092\u683c\u7d0d\u3057\u3066\u3059\u3079\u3066\u8868\u793a\u3057\u3066\u304f\u3060\u3055\u3044<\/p>\n\n\n\n<p>\u2461 \u5909\u6570\u300ctext\u300d\u3092\u4f5c\u308a\u3001\u6587\u5b57\u5217\u300c\u3042\u3044\u3046\u3048\u304a\u300d\u3092\u4ee3\u5165\u3057\u8868\u793a\u3057\u3066\u304f\u3060\u3055\u3044<\/p>\n\n\n\n<p>\u2462 HTML\u5185\u306b\u300cli\u8981\u7d20\u300d\u304c\u3042\u308b\u3068\u3057\u3066\u3001\u3053\u306e\u8981\u7d20\u3092\u3059\u3079\u3066\u8868\u793a\u3057\u3066\u304f\u3060\u3055\u3044<\/div><\/p>\n\n\n\n<p>\u8a2d\u554f\u306e\u56de\u7b54\u306f<a href=\"https:\/\/github.com\/masato99\/basic\/blob\/master\/docs\/for-of-sample.js\" target=\"_blank\" rel=\"noopener noreferrer\">\u30b3\u30c1\u30e9<\/a>\u304b\u3089\u95b2\u89a7\u3067\u304d\u307e\u3059\uff01<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">forEach\u6587\u3067\u914d\u5217\u306e\u4e2d\u8eab\u3092\u7e70\u308a\u8fd4\u3059<\/h2>\n\n\n\n<p>\u3055\u3066\u3001\u3044\u3088\u3044\u3088\u6700\u5f8c\u306b\u306a\u308a\u307e\u3057\u305f\u304c\u3001\u4eca\u5ea6\u306fforEach\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<p>\u3053\u308c\u306f\u914d\u5217\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306b\u3060\u3051\u4f7f\u3048\u308b\u69cb\u6587\u3067\u3001\u4f7f\u3044\u65b9\u304c\u7279\u5316\u3057\u3066\u3044\u308b\u3060\u3051\u3042\u3063\u3066\u6d3b\u7528\u3059\u308c\u3070\u914d\u5217\u3092\u4e0a\u624b\u306b\u6271\u3048\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>\u307e\u305a\u306f\u66f8\u304d\u65b9\u3067\u3059\u304c\u3001\u4e00\u822c\u7684\u306a\u69cb\u6587\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\uff01<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var array = [\u914d\u5217\u30c7\u30fc\u30bf];\n\narray.forEach( \u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570 )<\/pre>\n\n\n\n<p>\u914d\u5217\u30c7\u30fc\u30bf\u306e\u8981\u7d201\u3064\u305a\u3064\u306b\u5bfe\u3057\u3066\u3001<b>\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306b\u8a18\u8ff0\u3057\u305f\u51e6\u7406\u3092\u5b9f\u884c\u3067\u304d\u308b<\/b>\u306e\u304c\u5927\u304d\u306a\u7279\u5fb4\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u8a66\u3057\u306b\u3001\u7c21\u5358\u306a\u30b3\u30fc\u30c9\u4f8b\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\uff01<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var lists = [0, 1, 2, 3, 4, 5];\n\nlists.forEach( function( value ) {\n\n    console.log( value );\n\n});<\/pre>\n\n\n\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">0\n1\n2\n3\n4\n5<\/pre>\n\n\n\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u5185\u3067\u914d\u5217\u306e\u8981\u7d201\u3064\u305a\u3064\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u51fa\u529b\u3057\u3066\u3044\u308b\u306e\u304c\u308f\u304b\u308a\u307e\u3059\u3002forEach\u304c\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u308b\u3068\u3001\u4f8b\u3048\u3070\u8981\u7d20\u306e\u5024\u30922\u500d\u306b\u3057\u3066\u51fa\u529b\u3059\u308b\u3088\u3046\u306a\u3053\u3068\u3082\u7c21\u5358\u306b\u3067\u304d\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<p>\u914d\u5217\u306e\u8981\u7d20\u3068\u3057\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u683c\u7d0d\u3057\u3066\u3044\u308b\u3088\u3046\u306a\u8907\u96d1\u306a\u914d\u5217\u64cd\u4f5c\u3082\u3001\u4e0b\u8a18\u306e\u8a18\u4e8b\u3067\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n\n<p>&gt;&gt;<a href=\"https:\/\/www.sejuku.net\/blog\/20257\" target=\"_blank\" rel=\"noopener noreferrer\">forEach\u6587\u306e\u4f7f\u3044\u65b9\u3092\u57fa\u672c\u304b\u3089\u5fdc\u7528\u307e\u3067\u5fb9\u5e95\u89e3\u8aac\uff01<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u77e5\u3063\u3066\u304a\u304f\u3079\u304d3\u3064\u306e\u5f15\u6570<\/h3>\n\n\n\n<p>\u5b9f\u306f\u3001forEach\u6587\u306e\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306f<b>3\u3064\u306e\u5f15\u6570<\/b>\u3092\u53d7\u3051\u53d6\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">array.forEach( function( value, index, array ) {\n\n \/\/ \u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u66f8\u304f\n\n});<\/pre>\n\n\n\n<p>\u305d\u308c\u305e\u308c\u306e\u5f15\u6570\u306e\u610f\u5473\u306f\u3001\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\uff01<\/p>\n\n\n<div class=\"box01\">\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>\u300cvalue\u300d\u306f\u3001\u914d\u5217\u30c7\u30fc\u30bf\u306e\u5024<\/b><\/li>\n\n\n\n<li><b>\u300cindex\u300d\u306f\u3001\u914d\u5217\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7<\/b><\/li>\n\n\n\n<li><b>\u300carray\u300d\u306f\u3001\u73fe\u5728\u51e6\u7406\u3057\u3066\u3044\u308b\u914d\u5217<\/b><\/li>\n<\/ul>\n\n\n<\/div>\n\n\n\n<p>\u3064\u307e\u308a\u3001<b>\u4e0a\u8a18\u306e\u30c7\u30fc\u30bf\u3092\u914d\u5217\u306e\u8981\u7d201\u3064\u305a\u3064\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd<\/b>\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u3001\u8981\u7d20\u306e\u300c\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u300d\u3068\u300c\u5024\u300d\u3092\u540c\u6642\u306b\u51fa\u529b\u3059\u308b\u306b\u306f\u6b21\u306e\u3088\u3046\u306b\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var lists = ['\u30ea\u30f3\u30b4', '\u30d0\u30ca\u30ca', '\u30e1\u30ed\u30f3'];\n\nlists.forEach( function( value, index ) {\n  console.log( 'index: ' + index + ' | value: ' + value );\n});<\/pre>\n\n\n\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">index: 0 | value: \u30ea\u30f3\u30b4\nindex: 1 | value: \u30d0\u30ca\u30ca\nindex: 2 | value: \u30e1\u30ed\u30f3<\/pre>\n\n\n\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306e\u5f15\u6570\u300cvalue\u300d\u300cindex\u300d\u3092\u4f7f\u3063\u3066\u51fa\u529b\u3057\u3066\u3044\u308b\u306e\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u5f15\u6570\u3092\u4f7f\u3063\u305f\u6d3b\u7528\u6280\u3084\u3001\u914d\u5217\u4ee5\u5916\u306e\u30c7\u30fc\u30bf\u3092\u7d44\u307f\u8fbc\u3080\u65b9\u6cd5\u306a\u3069\u306b\u3064\u3044\u3066\u306f\u3001\u6b21\u306e\u8a18\u4e8b\u3067\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n\n<p>&gt;&gt;<a href=\"https:\/\/www.sejuku.net\/blog\/20257\" target=\"_blank\" rel=\"noopener noreferrer\">forEach\u6587\u306e\u4f7f\u3044\u65b9\u3092\u57fa\u672c\u304b\u3089\u5fdc\u7528\u307e\u3067\u5fb9\u5e95\u89e3\u8aac\uff01<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">forEach\u306f\u9014\u4e2d\u3067break\u3067\u304d\u306a\u3044<\/h3>\n\n\n\n<p>forEach\u3092\u4f7f\u3046\u4e0a\u3067\u6ce8\u610f\u3059\u308b\u3079\u304d\u70b9\u3068\u3057\u3066\u3001\u9014\u4e2d\u3067\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u629c\u3051\u3089\u308c\u306a\u3044\u3068\u3044\u3046\u70b9\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002(\u4f8b\u5916\u51e6\u7406\u306f\u9664\u304f)<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u6b21\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u4f8b\u3092\u60f3\u5b9a\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var item = [6,2,4,8,9];\n\nitem.forEach(function(value) {\n    if(value === 4) break;\n    \n    console.log( value );\n})<\/pre>\n\n\n\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u914d\u5217\u306e\u8981\u7d20\u304c\u300c4\u300d\u306e\u5834\u5408\u306bbreak\u3057\u3066\u51e6\u7406\u3092\u4e2d\u65ad\u3055\u305b\u308b\u3088\u3046\u306b\u66f8\u3044\u3066\u3044\u307e\u3059\u304c\u3001\u3053\u308c\u306f\u5b9f\u884c\u6642\u306b\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>forEach\u3067\u306f<b>\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u5185\u3067break\u3084continue\u306e\u8a18\u8ff0\u304c\u8a8d\u3081\u3089\u308c\u3066\u3044\u306a\u3044<\/b>\u306e\u3067\u3001\u540c\u3058\u3053\u3068\u3092\u5b9f\u73fe\u3057\u305f\u3044\u5834\u5408\u306b\u306f\u5225\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u3053\u3067\u3001\u4f3c\u305f\u3088\u3046\u306a\u6a5f\u80fd\u3092\u6301\u3064some\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u305f\u65b9\u6cd5\u304c\u3088\u304f\u4f7f\u308f\u308c\u308b\u306e\u3067\u3054\u7d39\u4ecb\u3057\u3066\u304a\u304d\u307e\u3059\uff01<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var item = [6,2,4,8,9];\n\nitem.some(function(value) {\n    if(value === 4) return true;\n\n    console.log(value);\n})<\/pre>\n\n\n\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">6\n2<\/pre>\n\n\n\n<p>\u66f8\u304d\u65b9\u306fforEach\u3068\u307b\u3068\u3093\u3069\u540c\u3058\u3067\u3001\u914d\u5217\u306e\u8981\u7d20\u304c\u300c4\u300d\u306e\u5834\u5408\u306b\u300creturn true\u300d\u3068\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u5373\u5ea7\u306b\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u4e2d\u65ad\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>some\u30e1\u30bd\u30c3\u30c9\u306f\u672c\u6765\u30c6\u30b9\u30c8\u7528\u306e\u95a2\u6570\u3068\u3057\u3066\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3059\u304c\u3001break\u306e\u4ee3\u308f\u308a\u306b\u300creturn true\u300d\u3068\u8a18\u8ff0\u3059\u308b\u3060\u3051\u306a\u306e\u3067\u4f7f\u3044\u3084\u3059\u3044\u308f\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u305f\u3060\u3057\u3001\u30e1\u30bd\u30c3\u30c9\u672c\u6765\u306e\u4f7f\u3044\u65b9\u3067\u306f\u306a\u304b\u3063\u305f\u308abreak\u306e\u8a18\u8ff0\u3067\u306f\u306a\u3044\u306e\u3067\u3001\u308f\u3056\u308f\u3056some\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u306a\u3089\u5358\u7d14\u306bfor\u6587\u3092\u4f7f\u3046\u306e\u3082\u624b\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var item = [6,2,4,8,9];\n\nfor(var i=0; i&lt;item.length; i++) {\n    if(item[i] === 4) break;\n\n    console.log(item[i]);\n}<\/pre>\n\n\n\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">6\n2<\/pre>\n\n\n\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001for\u6587\u3092\u4f7f\u3063\u3066\u914d\u5217\u8981\u7d20\u3092\u9806\u756a\u306b\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304a\u308a\u3001\u8981\u7d20\u304c\u300c4\u300d\u306e\u5834\u5408\u306bbreak\u3092\u5b9f\u884c\u3057\u3066\u51e6\u7406\u3092\u4e2d\u65ad\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u3061\u3089\u306e\u65b9\u304c\u672c\u6765\u306e\u7528\u9014\u306b\u9069\u3057\u3066\u304a\u308a\u3001\u3057\u3063\u304b\u308a\u3068break\u3067\u51e6\u7406\u304c\u4e2d\u65ad\u3067\u304d\u308b\u306e\u3067\u3001\u9014\u4e2d\u3067\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u629c\u3051\u308b\u3053\u3068\u304c\u60f3\u5b9a\u3055\u308c\u308b\u306e\u3067\u3042\u308c\u3070for\u6587\u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7406\u89e3\u5ea6\u30c1\u30a7\u30c3\u30af\uff01<\/h3>\n\n\n\n<p>\u3055\u3066\u3001forEach\u6587\u304c\u7406\u89e3\u3067\u304d\u305f\u304b\u3092\u30df\u30cb\u30c6\u30b9\u30c8\u3067\u30c1\u30a7\u30c3\u30af\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<p>\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u306f\u3001\u57fa\u672c\u7684\u306aforEach\u6587\u3092\u4f7f\u3063\u3066\u914d\u5217\u30c7\u30fc\u30bf\u3092\u8868\u793a\u3059\u308b\u4e8b\u4f8b\u3067\u3059\u3002<\/p>\n\n\n\n<p><iframe width=\"100%\" height=\"500\" src=\"https:\/\/paiza.io\/projects\/e\/pRtEK6YUlA2Mb5fyV3WAaQ?theme=github\" scrolling=\"no\" seamless=\"seamless\"><\/iframe><\/p>\n\n\n\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3057\u306a\u304c\u3089\u3001\u6b21\u306e\u8a2d\u554f\u306b\u6311\u6226\u3057\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n\n<p><div class=\"box01\">\uff1cforEach\u6587\u30df\u30cb\u30c6\u30b9\u30c8\uff1e<br>\u2460 \u914d\u5217\u30c7\u30fc\u30bf\u306e\u5076\u6570\u756a\u76ee\u3060\u3051\u3092\u8868\u793a\u3057\u3066\u304f\u3060\u3055\u3044<\/p>\n\n\n\n<p>\u2461 [2, 4, 9, 1, 7]\u306e\u914d\u5217\u3092\u4f5c\u308a\u3001\u3059\u3079\u3066\u306e\u5024\u30922\u500d\u306b\u3057\u3066\u8868\u793a\u3057\u3066\u304f\u3060\u3055\u3044<\/p>\n\n\n\n<p>\u2462 \u914d\u5217\u30c7\u30fc\u30bf\u66f8\u304d\u63db\u3048<\/div><\/p>\n\n\n\n<p>\u8a2d\u554f\u306e\u56de\u7b54\u306f<a href=\"https:\/\/github.com\/masato99\/basic\/blob\/master\/docs\/foreach-sample.js\" target=\"_blank\" rel=\"noopener noreferrer\">\u30b3\u30c1\u30e9<\/a>\u304b\u3089\u95b2\u89a7\u3067\u304d\u307e\u3059\uff01<\/p>\n\n\n\n<p>JavaScript\u3067\u540c\u3058\u3088\u3046\u306a\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3057\u305f\u3044\u6642\u3063\u3066\u3042\u308a\u307e\u3059\u3088\u306d\u3002\u305d\u306e\u305f\u3081\u306b\u540c\u3058\u30b3\u30fc\u30c9\u3092\u7e70\u308a\u8fd4\u3057\u66f8\u304f\u306e\u306f\u3001\u898b\u6804\u3048\u7684\u306b\u3082\u4f7f\u3044\u52dd\u624b\u7684\u306b\u3082\u306a\u304b\u306a\u304b\u30ca\u30f3\u30bb\u30f3\u30b9\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u306a\u305c\u306a\u3089\u3001JavaScript\u306a\u3069\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u306f\u540c\u3058\u30b3\u30fc\u30c9\u3092\u7e70\u308a\u8fd4\u3059\u51e6\u7406\u3092\u66f8\u304f\u69cb\u6587\u304c\u3042\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4eca\u56de\u306f\u3001JavaScript\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3067\u3088\u304f\u4f7f\u308f\u308c\u308bfor\u6587\u306a\u3069\u3092\u5fb9\u5e95\u89e3\u8aac\uff01<br><div class=\"box01\"><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>\u3010\u57fa\u790e\u3011\u30eb\u30fc\u30d7\u51e6\u7406\u3068\u306f\uff1f<\/b><\/li>\n\n\n\n<li><b>\u3010\u57fa\u790e\u3011for\u6587\u306e\u4f7f\u3044\u65b9\u3084\u5b9f\u8df5\u4f8b<\/b><\/li>\n\n\n\n<li><b>\u3010\u5b9f\u8df5\u3011for-in\u6587\u306e\u4f7f\u3044\u65b9\u3084\u5b9f\u8df5\u4f8b<\/b><\/li>\n\n\n\n<li><b>\u3010\u5b9f\u8df5\u3011for-of\u6587\u306e\u4f7f\u3044\u65b9\u3084\u5b9f\u8df5\u4f8b<\/b><\/li>\n\n\n\n<li><b>\u3010\u5b9f\u8df5\u3011forEach\u6587\u306e\u4f7f\u3044\u65b9\u3084\u5b9f\u8df5\u4f8b<\/b><\/li>\n\n\n\n<li><b>\u3010\u307e\u3068\u3081\u3011for\u6587\u306e\u4f7f\u3044\u65b9\u307e\u3068\u3081<\/b><\/li>\n<\/ul>\n\n\n<\/div>\n\n\n\n<p>\u3068\u3044\u3046\u6d41\u308c\u3067\u3001for\u6587\u306e\u57fa\u790e\u304b\u3089\u305d\u306e\u4ed6\u306e\u30eb\u30fc\u30d7\u51e6\u7406\u65b9\u6cd5\u307e\u3067\u3001\u8a73\u3057\u3044\u89e3\u8aac\u3084\u5b9f\u8df5\u7684\u306a\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u5404\u7ae0\u306e\u6700\u5f8c\u306b\u306f\u7406\u89e3\u5ea6\u3092\u30c1\u30a7\u30c3\u30af\u3067\u304d\u308b\u30df\u30cb\u30c6\u30b9\u30c8\u3082\u7528\u610f\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u3055\u3089\u306a\u308b\u7406\u89e3\u3092\u6df1\u3081\u308b\u305f\u3081\u306b\u305c\u3072\u6311\u6226\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n\n<p>\uff1e\uff1e\uff1e <a href=\"https:\/\/www.sejuku.net\/blog\/32681#i-9\">\u4eca\u3059\u3050\u300cfor\u306e\u4f7f\u3044\u65b9\u300d\u3092\u77e5\u308a\u305f\u3044\u65b9\u306f\u3053\u3061\u3089<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">while\u6587\u306b\u3088\u308b\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306b\u3064\u3044\u3066<\/h2>\n\n\n\n<p>\u3053\u308c\u307e\u3067\u3044\u304f\u3064\u304b\u306efor\u6587\u306b\u3088\u308b\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u898b\u3066\u304d\u307e\u3057\u305f\u304c\u3001JavaScript\u3067\u306f\u300cwhile\u6587\u300d\u3092\u4f7f\u3046\u3053\u3068\u3067\u3082\u540c\u69d8\u306b\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>while\u6587\u306f\u57fa\u672c\u7684\u306b\u7e70\u308a\u8fd4\u3057\u56de\u6570\u304c\u6c7a\u307e\u3063\u3066\u3044\u306a\u3044\u30eb\u30fc\u30d7\u51e6\u7406\u306b\u6700\u9069\u3067\u3001\u5b9f\u884c\u901f\u5ea6\u3082\u901f\u3044\u306e\u3067\u30b2\u30fc\u30e0\u306a\u3069\u306b\u3082\u3088\u304f\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u3001\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var i = 0;\n\nwhile(i &lt; 10) {\n  console.log(i++);\n}\n<\/pre>\n\n\n\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001while()\u306e\u5f15\u6570\u306b\u6761\u4ef6\u5f0f\u300ci &lt; 10\u300d\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u5909\u6570i\u304c10\u672a\u6e80\u306b\u306a\u308b\u307e\u3067\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u884c\u3046\u3068\u3044\u3046\u610f\u5473\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u3092\u5fdc\u7528\u3059\u308c\u3070\u3001\u914d\u5217\u306a\u3069\u3082\u7c21\u5358\u306b\u51e6\u7406\u3067\u304d\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\uff01<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var array = ['\u30ea\u30f3\u30b4', '\u30d0\u30ca\u30ca', '\u3044\u3061\u3054', '\u30e1\u30ed\u30f3'];\nvar i = 0;\n  \nwhile(i&lt;array.length) {\n  console.log(array[i++]);\n}\n<\/pre>\n\n\n\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001while()\u306e\u6761\u4ef6\u5f0f\u306b\u914d\u5217\u306e\u8981\u7d20\u6570\u3067\u3042\u308b\u300carray.length\u300d\u3092\u4f7f\u3063\u3066\u3044\u308b\u306e\u304c\u30dd\u30a4\u30f3\u30c8\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u914d\u5217\u306e\u8981\u7d20\u6570\u30921\u3064\u305a\u3064\u7e70\u308a\u8fd4\u3057\u3066\u51e6\u7406\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<p>While\u6587\u306b\u3064\u3044\u3066\u306e\u57fa\u672c\u304b\u3089\u5fdc\u7528\u307e\u3067\u306f\u3001\u6b21\u306e\u8a18\u4e8b\u3067\u4f53\u578bt\u7cfb\u306b\u307e\u3068\u3081\u3066\u3044\u308b\u306e\u3067\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/21463\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/04\/image-42-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010JavaScript\u5165\u9580\u3011while\u6587\u3067\u30eb\u30fc\u30d7\u51e6\u7406\u3068\u5236\u5fa1(break\/continue)<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h2 class=\"wp-block-heading\">for\u6587\u306e\u4f7f\u3044\u65b9\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u6700\u5f8c\u306b\u3001\u3053\u308c\u307e\u3067\u5b66\u7fd2\u3057\u3066\u304d\u305f\u5404\u7a2efor\u6587\u306e\u4f7f\u3044\u65b9\u3092\u307e\u3068\u3081\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305a\u306f\u57fa\u672c\u7684\u306afor\u6587\u306b\u3088\u308b\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u304a\u3055\u3089\u3044\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">for (  var i = 0;  i &lt; 10;  i++  ) {\n \n    console.log(i);\n \n}\n<\/pre>\n\n\n\n<p>for()\u306e\u5f15\u6570\u306b\u521d\u671f\u5024\u300cvar i = 0\u300d\u3001\u6761\u4ef6\u5f0f\u300ci &lt; 10\u300d\u3001\u5897\u6e1b\u5024\u300ci++\u300d\u3092\u305d\u308c\u305e\u308c\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u5b9f\u73fe\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u540c\u69d8\u306b\u3001\u914d\u5217\u306e\u5404\u8981\u7d20\u30921\u3064\u305a\u3064\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3059\u308b\u3053\u3068\u3082\u7c21\u5358\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var lists = ['\u4f50\u85e4', '\u4f0a\u85e4', '\u9234\u6728', '\u6728\u6751', '\u7530\u4e2d', '\u9ad8\u6a4b'];\n \nfor (  var i = 0;  i &lt; lists.length;  i++  ) {\n \n console.log ( lists[ i ] );\n \n}\n<\/pre>\n\n\n\n<p>\u30dd\u30a4\u30f3\u30c8\u306f\u3001\u6761\u4ef6\u5f0f\u306b\u914d\u5217\u306e\u8981\u7d20\u6570\u3092\u610f\u5473\u3059\u308b\u300clists.length\u300d\u3092\u5229\u7528\u3057\u3066\u3044\u308b\u70b9\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u306b\u3088\u308a\u3001\u5404\u8981\u7d20\u3092\u3059\u3079\u30661\u3064\u305a\u3064\u51e6\u7406\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u985e\u4f3c\u30e1\u30bd\u30c3\u30c9\u306e\u300cfor-in\u6587\u300d\u306b\u3088\u308b\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\uff01<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var myName = {\n \n    name: '\u592a\u90ce',\n    age: 20,\n    address: '\u6771\u4eac\u90fd\u6e0b\u8c37\u533a\u25cb\u25cb\u25cb'\n \n}\n \nfor( var item in myName ) {\n  \n    console.log( item );\n  \n}\n<\/pre>\n\n\n\n<p>\u3053\u308c\u306f\u4e3b\u306b\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u8981\u7d20\u3092\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3057\u305f\u3044\u5834\u5408\u306b\u6709\u52b9\u306a\u30e1\u30bd\u30c3\u30c9\u306b\u306a\u308a\u307e\u3059\u3002\u5909\u6570\u300citem\u300d\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c1\u3064\u305a\u3064\u683c\u7d0d\u3055\u308c\u3066\u3044\u304d\u3001\u9806\u6b21\u7e70\u308a\u8fd4\u3057\u3066\u51e6\u7406\u3092\u884c\u3046\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u6b21\u306b\u3001for-in\u6587\u306b\u3088\u304f\u4f3c\u305f\u8a18\u8ff0\u65b9\u6cd5\u3067\u914d\u5217\u3092\u6271\u3048\u308b\u300cfor-of\u6587\u300d\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\uff01<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var lists = [0, 1, 2, 3, 4, 5];\n \nfor( var item of lists ) {\n  \n  console.log( item );\n  \n}\n<\/pre>\n\n\n\n<p>\u3053\u3061\u3089\u3082\u540c\u69d8\u306b\u5909\u6570\u300citem\u300d\u306e\u4e2d\u306b\u914d\u5217\u306e\u5404\u8981\u7d20\u304c1\u3064\u305a\u3064\u683c\u7d0d\u3055\u308c\u3066\u3044\u304d\u3001\u9806\u6b21\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u914d\u5217\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306b\u7279\u5316\u3057\u305f\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u300cforEach\u6587\u300d\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">var lists = [0, 1, 2, 3, 4, 5];\n \nlists.forEach( function( value ) {\n \n    console.log( value );\n \n});\n<\/pre>\n\n\n\n<p>\u30dd\u30a4\u30f3\u30c8\u306fforEach()\u306e\u5f15\u6570\u306b\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u70b9\u3067\u3001\u5f15\u6570\u300cvalue\u300d\u306b\u914d\u5217\u306e\u5404\u8981\u7d20\u304c1\u3064\u305a\u3064\u683c\u7d0d\u3055\u308c\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u4eca\u56de\u306f\u3001for\u6587\u306a\u30694\u3064\u306e\u7e70\u308a\u8fd4\u3057\u69cb\u6587\u306e\u4f7f\u3044\u65b9\u3092\u4e00\u901a\u308a\u5b66\u7fd2\u3057\u307e\u3057\u305f\u304c\u3001\u7406\u89e3\u3067\u304d\u307e\u3057\u305f\u304b\uff1f<\/p>\n\n\n\n<p>\u3053\u3053\u3067\u3001\u7c21\u5358\u306b\u3082\u3046\u4e00\u5ea6\u307e\u3068\u3081\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><div class=\"box01\"><b>1,\u56de\u6570\u304c\u6c7a\u307e\u3063\u3066\u3044\u308b\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306ffor\u6587\u3092\u4f7f\u304a\u3046\uff01<br>2,\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6271\u3046\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306ffor-in\u6587\u3092\u4f7f\u304a\u3046\uff01<br>3,\u914d\u5217\u3092\u6271\u3046\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306fforEach\u6587\u3092\u4f7f\u304a\u3046\uff01<br>4,\u53e4\u3044\u30d6\u30e9\u30a6\u30b6\u3092\u8003\u616e\u3057\u306a\u3044\u5834\u5408\u306ffor-of\u6587\u3082\u4f7f\u3063\u3066\u3044\u3053\u3046\uff01<\/b><\/div><br>\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u3092\u57fa\u672c\u7684\u306a\u30d9\u30fc\u30b9\u3068\u3057\u3066\u610f\u8b58\u3057\u306a\u304c\u3089\u3001\u305c\u3072\u81ea\u5206\u306a\u308a\u306e\u6d3b\u7528\u65b9\u6cd5\u3092\u898b\u3064\u3051\u3066for\u6587\u30de\u30b9\u30bf\u30fc\u306b\u306a\u3063\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript\u3067\u540c\u3058\u3088\u3046\u306a\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3057\u305f\u3044\u6642\u3063\u3066\u3042\u308a\u307e\u3059\u3088\u306d\u3002\u305d\u306e\u305f\u3081\u306b\u540c\u3058\u30b3\u30fc\u30c9\u3092\u7e70\u308a\u8fd4\u3057\u66f8\u304f\u306e\u306f\u3001\u898b\u6804\u3048\u7684\u306b\u3082\u4f7f\u3044\u52dd\u624b\u7684\u306b\u3082\u306a\u304b\u306a\u304b\u30ca\u30f3\u30bb\u30f3\u30b9\u3067\u3059\u3002 \u306a\u305c\u306a\u3089\u3001JavaScript\u306a\u3069\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u306f\u540c\u3058 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":69184,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"{\"2b3d06a9\":{\"pv\":7760,\"imp\":5241,\"click\":1},\"d34d364c\":{\"pv\":7624,\"imp\":5182,\"click\":1}}","footnotes":""},"categories":[2346],"tags":[687,2095,2094,891,95],"class_list":["post-20777","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript-study","tag-for","tag-for-in","tag-for-of","tag-foreach","tag-javascript"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ 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