{"id":10534,"date":"2020-05-09T02:21:41","date_gmt":"2020-05-08T17:21:41","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=10534"},"modified":"2023-05-27T20:56:33","modified_gmt":"2023-05-27T11:56:33","slug":"%e3%80%90javascript%e3%80%91%e3%80%8cforeach%e3%80%8d%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=10534","title":{"rendered":"\u3010JavaScript\u3011\u914d\u5217\u306e\u4fbf\u5229\u30e1\u30bd\u30c3\u30c9\u300cforEach\u300d\u306b\u3064\u3044\u3066"},"content":{"rendered":"<h2>\u69cb\u6587<\/h2>\n<p>\u914d\u5217\u306b\u5bfe\u3057\u3066\u4e00\u3064\u4e00\u3064\u306e\u8981\u7d20\u306b\u5bfe\u3057\u3066\u533f\u540d\u95a2\u6570\u3084\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true\">\u914d\u5217.forEach(function(\u914d\u5217\u306e\u8981\u7d20){\r\n  \u914d\u5217\u306e\u8981\u7d20\u3092\u4f7f\u7528\u3057\u3066\u51e6\u7406;\r\n});<\/pre>\n<h2>\u7528\u9014<\/h2>\n<ul>\n<li>\u57fa\u672c\u7684\u306b\u306f\u914d\u5217\u306e\u4e2d\u306e\u5024\u306b\u5bfe\u3057\u3066\u4e00\u3064\u4e00\u3064\u7279\u5b9a\u306e\u95a2\u6570\u3092\u5b9f\u884c\u3057\u305f\u3044\u969b\u306b\u4f7f\u3044\u307e\u3059\u3002<\/li>\n<\/ul>\n<h2>\u30dd\u30a4\u30f3\u30c8<\/h2>\n<ul>\n<li>forEach\u306e\u4e2d\u3067\u914d\u5217\u306e\u8981\u7d20\u3092\u4e0a\u66f8\u304d\u3057\u305f\u308a\u7834\u58ca\u7684\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u4e8b\u3067\u5143\u306e\u914d\u5217\u3092\u4e0a\u66f8\u304d\u3059\u308b\u4e8b\u304c\u53ef\u80fd\u3067\u3059\u3002<\/li>\n<\/ul>\n<h2>map\u3068\u306e\u9055\u3044<\/h2>\n<ul>\n<li>forEach\u306f\u5143\u306e\u914d\u5217\u3092\u64cd\u4f5c\u3059\u308b\u306e\u306b\u5bfe\u3057\u3066\u3001map\u306f\u65b0\u3057\u3044\u914d\u5217\u3092\u4f5c\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<h2>\u4f8b<\/h2>\n<h3>\u4f8b\uff11\uff1a\u6587\u5b57\u5217\u306e\u914d\u5217\u3092\u8aad\u307f\u51fa\u3059\u3002<\/h3>\n<pre class=\"lang:default decode:true\">let animals = ['\u72ac','\u732b','\u30e9\u30a4\u30aa\u30f3']\r\nanimals.forEach(function(animal){\r\n  console.log(animal); \/\/\u72ac \u732b\u3000\u30e9\u30a4\u30aa\u30f3\r\n});<\/pre>\n<h3>\u4f8b2\uff1a\u6570\u5024\u306e\u5408\u8a08\u3092\u8a08\u7b97\u3059\u308b\u3002<\/h3>\n<pre class=\"lang:default decode:true \">let nums = [1,2,3];\r\nlet sum = 0;\r\nnums.forEach(function(num){\r\n\tsum += num;\r\n});\r\nsum; \/\/6<\/pre>\n<h4>forEach\u306b\u540d\u524d\u4ed8\u304d\u95a2\u6570\u3092\u6e21\u3059<\/h4>\n<p>\u306a\u304a\u3001forEach\u306b\u6e21\u3059\u95a2\u6570\u306f\u5f15\u6570\u3084\u5f15\u6570\u306e\u304b\u3063\u3053()\u3092\u6e21\u3059\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"lang:default decode:true \">let nums = [1,2,3];\r\nlet sum = 0;\r\n\r\nfunction calcSum(num){\r\n\tsum += num;\r\n}\r\n\r\nnums.forEach(calcSum);\r\nsum;  \/\/6<\/pre>\n<h3>\u4f8b3\uff1a\u8907\u96d1\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u914d\u5217\u306e\u64cd\u4f5c:filter\u3068\u7d44\u307f\u5408\u308f\u305b\u308b<\/h3>\n<pre class=\"lang:default decode:true \">let cats = [\r\n  {id:'\u3042',dirs:[{ name:'\u592a\u90ce',kind:'\u4e09\u6bdb\u732b' },{ name:'\u592a\u90ce2',kind:'\u4e09\u6bdb\u732b' }]},\r\n  {id:'\u3044',dirs:[{ name:'\u82b1\u5b50',kind:'\u4e09\u6bdb\u732b' },{ name:'\u82b1\u5b502',kind:'\u30da\u30eb\u30b7\u30e3\u732b' }]},\r\n  {id:'\u3046',dirs:[{ name:'\u82b1\u5b50',kind:'\u4e09\u6bdb\u732b' },{ name:'\u82b1\u5b503',kind:'\u30da\u30eb\u30b7\u30e3\u732b' }]}\r\n]\r\ncats.forEach(function(cat){\r\n  cat.dirs = cat.dirs.filter(function(dir){\r\n    return dir.kind  === '\u4e09\u6bdb\u732b';\r\n  });\r\n});\r\ncats;<\/pre>\n","protected":false},"excerpt":{"rendered":"\u69cb\u6587 \u914d\u5217\u306b\u5bfe\u3057\u3066\u4e00\u3064\u4e00\u3064\u306e\u8981\u7d20\u306b\u5bfe\u3057\u3066\u533f\u540d\u95a2\u6570\u3084\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002 \u914d\u5217.forEach(function(\u914d\u5217\u306e\u8981\u7d20){ \u914d\u5217\u306e\u8981\u7d20\u3092\u4f7f\u7528\u3057\u3066\u51e6\u7406; }); \u7528\u9014 \u57fa\u672c\u7684\u306b\u306f\u914d\u5217\u306e\u4e2d\u306e\u5024\u306b\u5bfe\u3057\u3066\u4e00\u3064\u4e00\u3064\u7279 [&hellip;]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[16],"tags":[],"_links":{"self":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/10534"}],"collection":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10534"}],"version-history":[{"count":11,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/10534\/revisions"}],"predecessor-version":[{"id":20284,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/10534\/revisions\/20284"}],"wp:attachment":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10534"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10534"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10534"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}