{"width":"100%","blog_title":"soukouki\u2019s diary","description":"combination (1..4).to_a.combination(2).to_a => [[1, 2], [1, 3], [1, 4], [2, 3], [2, 4], [3, 4]] permutation (1..4).to_a.permutation(2).to_a => [[1, 2], [1, 3], [1, 4], [2, 1], [2, 3], [2, 4], [3, 1], [3, 2], [3, 4], [4, 1], [4, 2], [4, 3]] combination\u304b\u3089[2, 1], [3, 2]\u7b49\u304c\u5897\u3048\u305f repeated_combination (1..4)\u2026","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fsoukouki.hatenablog.jp%2Fentry%2F2016%2F06%2F11%2F000934\" title=\"ruby\u3067\u7d44\u307f\u5408\u308f\u305b\u3092\u5217\u6319\u3057\u305f\u308a\u3059\u308b\u30e1\u30be\u30c3\u30c9 - soukouki\u2019s diary\" 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/soukouki/","title":"ruby\u3067\u7d44\u307f\u5408\u308f\u305b\u3092\u5217\u6319\u3057\u305f\u308a\u3059\u308b\u30e1\u30be\u30c3\u30c9","height":"190","categories":["Ruby"],"author_name":"soukouki","blog_url":"https://soukouki.hatenablog.jp/","type":"rich","provider_url":"https://hatena.blog","image_url":null,"version":"1.0","published":"2016-06-11 00:09:34","url":"https://soukouki.hatenablog.jp/entry/2016/06/11/000934","provider_name":"Hatena Blog"}