{"image_url":null,"description":"\u6570\u5024\u306bNaN\u3092\u8db3\u3059\u3068NaN\u306b\u306a\u308a\u307e\u3059\u3002 \u5b9f\u969b\u306e\u3068\u3053\u308d \u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570NaN\u306f\"Not-A-Number\"\u306e\u7565\u3067\u3001\u6570\u5024\u3067\u306a\u3044\u4e8b\u3092\u793a\u3059\u5909\u6570\u3067\u3059\u3002 \u6570\u5024\u3092\u5410\u304d\u51fa\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u30df\u30b9\u3063\u305f\u5834\u5408\u306b\u51fa\u529b\u3055\u308c\u307e\u3059\u3002 Math.sqrt(-1) // NaN \u3053\u306eNaN\u3001\u4e00\u3064\u5947\u5999\u306a\u7279\u6027\u304c\u3042\u308a\u2026\u2026\u65e2\u5b58\u306e\u6570\u5024\u306b\u8db3\u3057\u8fbc\u3080\u3068\u3001\u5dfb\u304d\u6dfb\u3048\u3092\u55b0\u3089\u3063\u3066NaN\u306b\u306a\u308a\u307e\u3059 var a = 1 a += NaN console.log(a) // => NaN \u3053\u308c\u306ffalse\u3084null\u3067\u306f\u767a\u751f\u3057\u306a\u3044\u73fe\u8c61\u3067\u3059\u3002 console.log(7 + false) // 7 console.log(7 + null) // 7 console.\u2026","type":"rich","height":"190","author_name":"shuzo_kino","categories":["javascript"],"url":"https://shuzo-kino.hateblo.jp/entry/2016/05/03/220525","version":"1.0","provider_url":"https://hatena.blog","author_url":"https://blog.hatena.ne.jp/shuzo_kino/","blog_url":"https://shuzo-kino.hateblo.jp/","blog_title":"Bye Bye Moore","published":"2016-05-03 22:05:25","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fshuzo-kino.hateblo.jp%2Fentry%2F2016%2F05%2F03%2F220525\" title=\"\u6570\u5024\u306bNaN\u3092\u8db3\u3059\u3068NaN\u306b\u306a\u308b - Bye Bye Moore\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","title":"\u6570\u5024\u306bNaN\u3092\u8db3\u3059\u3068NaN\u306b\u306a\u308b","provider_name":"Hatena Blog","width":"100%"}