{"author_url":"https://blog.hatena.ne.jp/kuronekopunk/","image_url":null,"published":"2018-03-31 18:40:43","width":"100%","author_name":"kuronekopunk","type":"rich","provider_name":"Hatena Blog","title":"Ruby\u306emin_by\u3067\u6bd4\u8f03\u5bfe\u8c61\u306bnil\u304c\u3044\u308b\u3068ArgumentError\u3067\u30b3\u30b1\u308b","url":"https://akinobu.net/entry/2018/03/31/184043","provider_url":"https://hatena.blog","version":"1.0","blog_title":"\u30ce\u30f3\u30ab\u30d5\u30a7\u30a4\u30f3\u3067\u3042\u306a\u305f\u306b\u3084\u3055\u3057\u3044","categories":["Ruby","Rails"],"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fakinobu.net%2Fentry%2F2018%2F03%2F31%2F184043\" title=\"Ruby\u306emin_by\u3067\u6bd4\u8f03\u5bfe\u8c61\u306bnil\u304c\u3044\u308b\u3068ArgumentError\u3067\u30b3\u30b1\u308b - \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>","description":"Ruby\u306e\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb arr = [ { name: \"hoge1\", age: 10 }, { name: \"hoge2\", age: 13 }, { name: \"hoge3\", age: 15 }, { name: \"hoge4\", age: nil } ] arr.min_by{ |e| e[:age] } => ArgumentError (comparison of NilClass with 10 failed) \u30d6\u30ed\u30c3\u30af\u306e\u623b\u308a\u5024\u306b<=>\u3067\u6bd4\u8f03\u3067\u304d\u306a\u3044\u3082\u306e\u304c\u6df7\u3058\u3063\u3066\u3044\u308b\u3068\u4f8b\u5916ArgumentError min_by (Enumerable) - Ruby\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9 \u3068\u306e\u3053\u3068\u2026","blog_url":"https://akinobu.net/","height":"190"}