{"type":"rich","image_url":"http://ecx.images-amazon.com/images/I/41ZWYC1Y0GL.jpg","blog_title":"maeshima\u306e\u65e5\u8a18","blog_url":"https://maeshima.hateblo.jp/","provider_url":"https://hatena.blog","author_url":"https://blog.hatena.ne.jp/maeshima/","width":"100%","provider_name":"Hatena Blog","categories":["ruby"],"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmaeshima.hateblo.jp%2Fentry%2F20110118%2F1295334482\" title=\"Array \u305d\u306e3 - maeshima\u306e\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","version":"1.0","published":"2011-01-18 16:08:02","description":"Array#count \u5f15\u6570\u3092\u6e21\u3055\u306a\u304b\u3063\u305f\u5834\u5408\u306f\u8981\u7d20\u306e\u500b\u6570\u3092\u8fd4\u3059\u3002\u5f15\u6570\u3092\u6e21\u3057\u305f\u5834\u5408\u306f\u3001\u5f15\u6570\u3068\u7b49\u3057\u3044\u8981\u7d20\u306e\u500b\u6570\u3092\u8fd4\u3059 [1,2,2,3,3,3].count(2) #=> 2 \u307e\u305f\u306f\u30d6\u30ed\u30c3\u30af\u3092\u8a55\u4fa1\u3057\u305f\u7d50\u679c\u304c\u771f\u306b\u306a\u308b\u8981\u7d20\u306e\u500b\u6570\u3092\u8fd4\u3059\u3002 [1,2,2,3,3,3].count do |obj| obj > 2; end #=> 3 \u3069\u3046\u3082Rails\u8133\u3060\u3068count\u306fActiveRecord\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u5370\u8c61\u304c\u3042\u3063\u3066\u3044\u3051\u306a\u3044\u3002Enumerable\u306b\u3082\u540c\u3058\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308b\u307f\u305f\u3044\u3002 misc \u672c\u3067\u306f\u300c\u5f15\u6570\u3092\u6e21\u3055\u306a\u304b\u3063\u305f\u5834\u5408\u306fEnumerator\u3092\u8fd4\u3059\u300d\u3063\u3066\u66f8\u3044\u3066\u3042\u3063\u305f\u3051\u3069\u9055\u3063\u305f\u3002\u9014\u4e2d\u3067\u6319\u52d5\u304c\u5909\u308f\u3063\u305f\u306e\u304b\u306a\uff1f \u2026","author_name":"maeshima","title":"Array \u305d\u306e3","url":"https://maeshima.hateblo.jp/entry/20110118/1295334482","height":"190"}