{"image_url":null,"blog_url":"https://akinobu.net/","width":"100%","version":"1.0","blog_title":"\u30ce\u30f3\u30ab\u30d5\u30a7\u30a4\u30f3\u3067\u3042\u306a\u305f\u306b\u3084\u3055\u3057\u3044","author_name":"kuronekopunk","title":"Rails\u3067nil? empty? blank? present? \u3092\u4f7f\u3046","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fakinobu.net%2Fentry%2F2014%2F07%2F23%2F162148\" title=\"Rails\u3067nil? empty? blank? present? \u3092\u4f7f\u3046 - \u30ce\u30f3\u30ab\u30d5\u30a7\u30a4\u30f3\u3067\u3042\u306a\u305f\u306b\u3084\u3055\u3057\u3044\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","author_url":"https://blog.hatena.ne.jp/kuronekopunk/","height":"190","provider_url":"https://hatena.blog","published":"2014-07-23 16:21:48","categories":["Ruby on Rails"],"url":"https://akinobu.net/entry/2014/07/23/162148","provider_name":"Hatena Blog","description":"Rails\u3067nil\u3084empty\u5224\u5b9a\u3092\u3057\u305f\u3044\u6642\u306b\u4f7f\u3046\u30e1\u30bd\u30c3\u30c9 nil? Ruby\u306e\u6a19\u6e96\u30e1\u30bd\u30c3\u30c9 nil\u306e\u5834\u5408\u3060\u3051true\u3092\u8fd4\u3057\u3001\u305d\u308c\u4ee5\u5916\u306ffalse\u3092\u8fd4\u3059\u3002 nil\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5b58\u5728\u3057\u3066\u3044\u306a\u3044\u3068\u3044\u3046\u3053\u3068 name = \"\" name.nil? # name\u306f\u7a7a\u3060\u304c\u5b58\u5728\u3059\u308b\u305f\u3081false age.nil? # age\u306f\u5b58\u5728\u3057\u306a\u3044\u305f\u3081true empty? Ruby\u3067Array\u3084String\u306b\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u30e1\u30bd\u30c3\u30c9 \u6587\u5b57\u5217\u3084\u914d\u5217\u304c\u7a7a\u306e\u5834\u5408true\u3092\u8fd4\u3059\u3002 nil\u306b\u5bfe\u3057\u3066\u547c\u3073\u51fa\u3059\u3068NoMethodError\u304c\u767a\u751f\u3059\u308b\u3002 empty\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7a7a\u3060\u3068\u3044\u3046\u3053\u3068 name = \"\" name.empt\u2026","type":"rich"}