{"provider_url":"https://hatena.blog","blog_url":"https://sirocco.hatenadiary.org/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fsirocco.hatenadiary.org%2Fentry%2F20090417%2F1239915676\" title=\"lookup \u95a2\u6570\u306f Maybe \u30e2\u30ca\u30c9\u3092\u8fd4\u3059 - sirocco \u306e\u66f8\u3044\u3066\u3082\u3059\u3050\u306b\u5fd8\u308c\u308b\u30e1\u30e2\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","published":"2009-04-17 06:01:16","version":"1.0","url":"https://sirocco.hatenadiary.org/entry/20090417/1239915676","blog_title":"sirocco \u306e\u66f8\u3044\u3066\u3082\u3059\u3050\u306b\u5fd8\u308c\u308b\u30e1\u30e2","type":"rich","description":"lookup \u95a2\u6570\u306f Maybe \u30e2\u30ca\u30c9\u3092\u8fd4\u3059 Prelude> :t lookup lookup :: (Eq a) => a -> [(a, b)] -> Maybe b Prelude> let taro = (\"taro\",[(\"sex\",\"male\"),(\"address\",\"chiba\")]) Prelude> let jiro = (\"jiro\",[(\"sex\",\"male\"),(\"address\",\"tokyo\")]) Prelude> let person = [taro,jiro] Prelude> person [(\"taro\",[(\"sex\",\"male\"),(\"add\u2026","author_url":"https://blog.hatena.ne.jp/sirocco/","height":"190","categories":["Haskell"],"image_url":null,"provider_name":"Hatena Blog","width":"100%","author_name":"sirocco","title":"lookup \u95a2\u6570\u306f Maybe \u30e2\u30ca\u30c9\u3092\u8fd4\u3059"}