{"image_url":null,"provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmurajun1978.hatenadiary.com%2Fentry%2F2014%2F09%2F13%2F020210\" title=\"Ruby\u306eArray\u8981\u7d20\u306e\u8a08\u7b97\u30d8(^o^)\u30ce - Murajun&#39;s Style\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","published":"2014-09-13 02:02:10","width":"100%","categories":["Ruby"],"author_name":"murajun1978","provider_name":"Hatena Blog","height":"190","author_url":"https://blog.hatena.ne.jp/murajun1978/","title":"Ruby\u306eArray\u8981\u7d20\u306e\u8a08\u7b97\u30d8(^o^)\u30ce","version":"1.0","blog_url":"https://murajun1978.hatenadiary.com/","blog_title":"Murajun's Style","url":"https://murajun1978.hatenadiary.com/entry/2014/09/13/020210","description":"Array\u306e\u8981\u7d20\u3092\u8a08\u7b97\u3057\u305f\u3044\u30b1\u30fc\u30b9\u304c\u591a\u3005\u3042\u308a\u307e\u3059\u3002 \u4ee3\u8868\u7684\u306a\u3082\u306e\u304c\u3053\u308c [1, 2, 3].inject(:+) # => 6 \u5f15\u6570\u3092\u6e21\u3057\u305f\u3044\uff01 [1, 2, 3].each_with_object(1).map(&:+) # => [2, 3, 4] \u4e8c\u6b21\u5143\u914d\u5217\u3067\u8981\u7d20\u3054\u3068\u306e\u96c6\u8a08 0\u756a\u76ee\u30011\u756a\u76ee\u30013\u756a\u76ee\u306e\u8981\u7d20\u3092\u96c6\u8a08\u3057\u3066\u3044\u307e\u3059\u3002 [[1, 2, 3], [4, 5, 6]].transpose.map{|n| n.inject(:+)} # => [5, 7, 9] Array#transpose\u306f\u884c\u3068\u5217\u306e\u5165\u308c\u66ff\u3048\u3092\u3057\u307e\u3059\u3002 [[1, 2, 3], [4, 5, 6]].transpose # \u2026","type":"rich"}