{"url":"https://ksss9.hatenablog.com/entry/2018/01/08/180523","title":"\u5730\u5473\u3059\u304e\u3066\u8ab0\u3082\u6c17\u304c\u3064\u3044\u3066\u3044\u306a\u3044CRuby 2.5\u306e\u65b0\u6a5f\u80fd","blog_url":"https://ksss9.hatenablog.com/","provider_name":"Hatena Blog","provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fksss9.hatenablog.com%2Fentry%2F2018%2F01%2F08%2F180523\" title=\"\u5730\u5473\u3059\u304e\u3066\u8ab0\u3082\u6c17\u304c\u3064\u3044\u3066\u3044\u306a\u3044CRuby 2.5\u306e\u65b0\u6a5f\u80fd - \u30b9\u30da\u30af\u30c8\u30e9\u30e0\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","blog_title":"\u30b9\u30da\u30af\u30c8\u30e9\u30e0","version":"1.0","description":"did_you_mean gem\u304cKeyError\u306b\u3082\u52b9\u304f\u3088\u3046\u306b\u306a\u3063\u305f\u3088 KeyError\u306f\u6307\u5b9a\u3057\u305fkey\u306b\u5bfe\u3059\u308bvalue\u304c\u898b\u3064\u304b\u3089\u306a\u304b\u3063\u305f\u3068\u304d\u306b\u8d77\u3053\u308b\u4f8b\u5916\u3067\u3001IndexError\u304b\u3089\u6d3e\u751f\u3057\u305f\u3082\u306e\u3067\u3059\u3002 KeyError\u304c\u8d77\u3053\u308a\u5f97\u308b\u306e\u306fHash#fetch Hash#fetch_values ENV.fetch Kernel.sprintf String#%\u306e5\u3064\u3067\u3059\u3002 \u3053\u306e\u30e1\u30bd\u30c3\u30c9\u9054\u3067\u3001\u63a2\u3057\u305fkey\u304c\u898b\u3064\u304b\u3089\u306a\u304b\u3063\u305f\u3068\u304d\u306b\u8fd1\u3057\u3044\u5019\u88dc\u3092\u30b5\u30b8\u30a7\u30b9\u30c8\u3057\u3066\u304f\u308c\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002 $ ruby h = {foo: 1, bar: 2} h.fetch(:bax) Traceback (most \u2026","width":"100%","type":"rich","image_url":null,"height":"190","categories":[],"published":"2018-01-08 18:05:23","author_name":"ksss9","author_url":"https://blog.hatena.ne.jp/ksss9/"}