{"image_url":null,"height":"190","type":"rich","blog_title":"\u305d\u308c\u30de\u30b0\u3067\uff01","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Ftakuya-1st.hatenablog.jp%2Fentry%2F2013%2F03%2F26%2F025420\" title=\"Ruby\u3067\u6587\u5b57\u5217\u304c\u6574\u6570\u5024\u306b\u5909\u63db\u3067\u304d\u308b\u304b\u8abf\u3079\u308b - \u305d\u308c\u30de\u30b0\u3067\uff01\" 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","provider_url":"https://hatena.blog","author_name":"takuya_1st","published":"2013-03-26 02:54:20","title":"Ruby\u3067\u6587\u5b57\u5217\u304c\u6574\u6570\u5024\u306b\u5909\u63db\u3067\u304d\u308b\u304b\u8abf\u3079\u308b","blog_url":"https://takuya-1st.hatenablog.jp/","author_url":"https://blog.hatena.ne.jp/takuya_1st/","categories":[],"provider_name":"Hatena Blog","url":"https://takuya-1st.hatenablog.jp/entry/2013/03/26/025420","width":"100%","description":"Ruby\u3067\u6587\u5b57\u5217\u304c\u6570\u5b57\u5909\u63db\u53ef\u80fd\u304b\u8abf\u3079\u305f\u3044\u3002\u5f15\u6570\u3068\u304b\u6587\u5b57\u5217\u3067\u53d6\u3063\u3066\u304a\u3044\u3066\u6570\u5b57\u306b\u5909\u63db\u3067\u304d\u308b\u304b\u3002 String#to_i \u306e\u3053\u306e\u4ed5\u69d8\u304c\u6b7b\u306c\u307b\u3069\u5acc\u3060 \"3\".to_i #=> 3 \"2\".to_i #=> 2 \"1\".to_i #=> 1 \"0\".to_i #=> 0 \"a\".to_i #=> 0 \u2190\uff01\uff01\uff01 to_i \u3057\u3066 0\u306a\u3089\u30c0\u30e1\u3063\u3066\u3084\u308d\u3046\u3068\u3057\u3066\u3001\u8a70\u3093\u3060\u3002 php \u306a\u3089 is_numeric\u95a2\u6570\u3067\u6e08\u3080 <?php var_dump( is_numeric(\"0\") ); #=> true \u3082\u3063\u3068\u3082PHP\u306e\u5834\u5408\u306f\u3001\u8af8\u5203\u306e\u5263\u3067\u3057\u3066\u30fb\u30fb\u30fb String#to_i\u3084to_f\u306f\u3042\u308b\u7a0b\u5ea6\u306f\u5224\u5225\u3067\u304d\u308b\u3051\u3069\u3002\u3002\u3002\u2026"}