{"description":"unshift\u306fArray\u306e\u5148\u982d\u306b\u8981\u7d20\u3092\u8ffd\u52a0\u3057\u3001Array\u3092\u8fd4\u3059\u3002 \u8907\u6570\u8ffd\u52a0\u3067\u304d\u308b\u3002 \u9577\u30550\u306eArray\u3092\u7528\u610f\u3057\u3066\u3001 \u4f55\u3082\u8ffd\u52a0\u3057\u306a\u3044\u3068\u3044\u3046\u306e\u309210\u4e07\u56de\u7e70\u308a\u8fd4\u3059\u3002 \u3053\u306e\u5b9f\u884c\u6642\u9593\u306e10\u56de\u5e73\u5747\u3092\u51fa\u3059\u3002 // 232ms function test1() { var a = [ ]; for(var i = 0; i a.unshift(); } }// 1086ms Array.prototype.unshift2 = function() { var arg_length = arguments.length; if(arg_length > 0) { var length = this.leng\u2026","author_url":"https://blog.hatena.ne.jp/inamori/","blog_url":"https://inamori.hateblo.jp/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Finamori.hateblo.jp%2Fentry%2F20061201%2Fp1\" title=\"JScript\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u901f\u5ea6/unshift\uff081\uff09 - inamori\u2019s diary\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","provider_url":"https://hatena.blog","width":"100%","title":"JScript\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u901f\u5ea6/unshift\uff081\uff09","type":"rich","blog_title":"inamori\u2019s diary","author_name":"inamori","version":"1.0","height":"190","provider_name":"Hatena Blog","categories":["JavaScript"],"url":"https://inamori.hateblo.jp/entry/20061201/p1","published":"2006-12-01 00:00:00","image_url":null}