{"id":546,"date":"2014-08-12T10:00:39","date_gmt":"2014-08-12T01:00:39","guid":{"rendered":"http:\/\/www.sria.co.jp\/blog\/?p=546"},"modified":"2014-08-12T10:01:30","modified_gmt":"2014-08-12T01:01:30","slug":"is-a-great-repeat-in-javascript","status":"publish","type":"post","link":"https:\/\/www.sria.co.jp\/blog\/2014\/08\/is-a-great-repeat-in-javascript\/","title":{"rendered":"JavaScript\u3067\u7e70\u308a\u8fd4\u3059\u306e\u306b\u6700\u9069\u306a\u306e\u306f\uff1f"},"content":{"rendered":"<p>\u307f\u3093\u306a\u5927\u597d\u304dJavaScript\u306e\u6642\u9593\u3067\u3059\u3002<br \/>\n\u4eca\u56de\u306f\u3001\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306b\u6700\u9069\u306a\u66f8\u304d\u65b9\u3092\u63a2\u3063\u3066\u307f\u307e\u3059\u3002<\/p>\n<p><!--more--><\/p>\n<p>&nbsp;<\/p>\n<h3>\u00a0\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306e\u4ef2\u9593\u305f\u3061<\/h3>\n<p>JavaScript\u3067\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3068\u3044\u3046\u3068<\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li>for\u6587<\/li>\n<li>forEach\u6587<\/li>\n<li>jQuery.each\u6587<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>\u304c\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>\u4eca\u56de\u306f\u3053\u306e\uff13\u8005\u3067\u7af6\u3063\u3066\u307f\u3088\u3046\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h3>\u8a08\u6e2c\u6e96\u5099<\/h3>\n<p>\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3068\u3044\u3046\u3053\u3068\u3067\u3001Array\u306b\u6570\u5b57\u3092\u5165\u308c\u3066\u304a\u3044\u3066\u3001<br \/>\n\u305d\u308c\u3092\u3072\u305f\u3059\u3089\u52a0\u7b97\u3057\u3066\u3044\u304f\u51e6\u7406\u306b\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u3053\u3093\u306a\u611f\u3058\u3067\u51e6\u7406\u5bfe\u8c61\u306e\u914d\u5217\u3092\u6e96\u5099\u3057\u307e\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<pre class=\"lang:js decode:true \">var data = Array();\r\nfor (var i=0 ; i &lt; 10000000 ; i++) {\r\n\tdata.push(i+1);\r\n}<\/pre>\n<p>&nbsp;<\/p>\n<p>\u8981\u7d20\u6570\u306f1000\u4e07\u500b\u7528\u610f\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>&nbsp;<\/p>\n<h3>for\u6587<\/h3>\n<p>\u7b2c\u4e00\u8d70\u8005\u306efor\u6587\u9078\u624b\u3067\u3059\u3002<br \/>\nJavaScript\u672c\u306a\u3069\u3067\u3082\u5fc5\u305a\u51fa\u3066\u304f\u308b\u5f80\u5e74\u306e\u719f\u7df4\u9078\u624b\u3063\u3066\u611f\u3058\u3067\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<pre class=\"lang:js decode:true\">result = 0;\r\nst = new Date();\r\nfor (var i=0 ; i &lt; data.length ; i++) {\r\n\tresult += data[i];\r\n}\r\ned = new Date();<\/pre>\n<p>&nbsp;<\/p>\n<p>\u4ed6\u306e\u8a00\u8a9e\u3067\u3082\u898b\u6163\u308c\u305f\u611f\u3058\u306e\u96f0\u56f2\u6c17\u3067\u3059\u306d\u3002<\/p>\n<p>&nbsp;<\/p>\n<h3>forEach\u6587<\/h3>\n<p>&nbsp;<\/p>\n<p>\u3069\u3061\u3089\u304b\u3068\u3044\u3046\u3068\u65b0\u3057\u76ee\u306e\u69cb\u6587\u3067\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<pre class=\"lang:js decode:true\">result = 0;\r\nst = new Date();\r\ndata.forEach(function(v, i, arr){\r\n result += v;\r\n});\r\ned = new Date();\r\n<\/pre>\n<p>&nbsp;<\/p>\n<p>\u914d\u5217.forEach\u3063\u3066\u611f\u3058\u3067\u8a18\u8ff0\u3057\u3066\u5185\u90e8\u51e6\u7406\u306ffunction\u306b\u8a18\u8f09\u3068\u3044\u3046\u611f\u3058\u3067\u3059\u3002<br \/>\n\u306a\u3093\u3068\u306a\u304f\u6700\u8fd1\u306e\u82e5\u8005\u7684\u306a\u611f\u3058\u304c\u3057\u307e\u3059\uff08\u8b0e<\/p>\n<p>&nbsp;<\/p>\n<h3>jQuery.each\u6587<\/h3>\n<p>\u6700\u5f8c\u306f\u3001jQuery\u754c\u304b\u3089\u306e\u6bb4\u308a\u8fbc\u307f\u3067\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<pre class=\"lang:js decode:true\">result = 0;\r\nst = new Date();\r\n$.each(data, function(){\r\n      result += this;\r\n});\r\ned = new Date();\r\n<\/pre>\n<p>&nbsp;<\/p>\n<p>\u96f0\u56f2\u6c17\u306f\u3001forEach\u306b\u3059\u3054\u304f\u4f3c\u3066\u307e\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<h3>\u7d50\u679c<\/h3>\n<p>\u4e0a\u8a18\u3067\u30b3\u30fc\u30c9\u5185\u306b\u6642\u9593\u8a08\u6e2c\u306e\u30b3\u30fc\u30c9\u3092\u5165\u308c\u3066\u307e\u3059\u304c\u3001\u305d\u306e\u7d50\u679c\u304c\u4ee5\u4e0b\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<ol>\n<li>for\u6587\uff080.08\u79d2\uff09<\/li>\n<li>forEach\u6587\uff080.56\u79d2\uff09<\/li>\n<li>jQuery.each\u6587\uff082.3\u79d2\uff09<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p>for\u6587\u306e\u5727\u5012\u7684\u52dd\u5229\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3057\u305f\u3002<br \/>\n\u3055\u3059\u304c\u5f80\u5e74\u306e\u9078\u624b\u3063\u3066\u611f\u3058\u3067\u3059\u3002<\/p>\n<p>\u203b\u4f55\u56de\u304b\u3084\u3063\u3066\u307f\u307e\u3057\u305f\u304c\u3001\u6642\u9593\u306e\u4e0a\u4e0b\u306f\u3042\u308c\u3069\u9806\u4f4d\u306b\u306f\u97ff\u304b\u306a\u304b\u3063\u305f\u3067\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u3068\u3044\u3046\u3053\u3068\u3067\u3001JavaScript\u3067\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3059\u308b\u6642\u3001<br \/>\n\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u7684\u306a\u3068\u3053\u308d\u3060\u3068\u3001\u300cfor\u6587\u300d\u3092\u4f7f\u7528\u3059\u308b\u306e\u304c\u4e00\u756a\u826f\u3055\u305d\u3046\u3067\u3059\u3002<br \/>\n\u203b\u8d85\u5358\u7d14\u306a\u51e6\u7406\u306e\u7d50\u679c\u306a\u306e\u3067\u3001\u3042\u3068\u306f\u6642\u3068\u5834\u5408\u306b\u3088\u3063\u3066\u4f7f\u3044\u5206\u3051\u307e\u3057\u3087\u3046\uff08\u30fb\u2200\u30fb\uff09\uff86\uff94\uff86\uff94<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u307f\u3093\u306a\u5927\u597d\u304dJavaScript\u306e\u6642\u9593\u3067\u3059\u3002 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