{"height":"190","image_url":null,"version":"1.0","blog_url":"https://kazu-yamamoto.hatenablog.jp/","provider_url":"https://hatena.blog","title":"\u30e2\u30ca\u30c9\u5247","author_url":"https://blog.hatena.ne.jp/kazu-yamamoto/","provider_name":"Hatena Blog","categories":["Haskell"],"url":"https://kazu-yamamoto.hatenablog.jp/entry/20080222/1203665506","author_name":"kazu-yamamoto","blog_title":"\u3042\u3069\u3051\u306a\u3044\u8a71","type":"rich","published":"2008-02-22 16:31:46","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkazu-yamamoto.hatenablog.jp%2Fentry%2F20080222%2F1203665506\" title=\"\u30e2\u30ca\u30c9\u5247 - \u3042\u3069\u3051\u306a\u3044\u8a71\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","width":"100%","description":"3\u3064\u306e\u30e2\u30ca\u30c9\u5247\u306e\u5185\u3001\u3088\u3046\u3084\u304f2\u3064\u304c\u7406\u89e3\u3067\u304d\u307e\u3057\u305f\u3002 (return x) >>= f == f x \u4ee5\u4e0b\u306e\u3088\u3046\u306a DB \u3092\u8003\u3048\u307e\u3059\u3002 db = [(\"alice\", [(\"title\", \"Ms.\"), (\"city\", \"Yokohama\")]), (\"bob\", [(\"title\", \"Mr.\"), (\"city\", \"Sapporo\" )])] \"alice\" \u306e \"city\" \u304c\u8abf\u3079\u305f\u3044\u306a\u3089\u3001\u3053\u3046\u3044\u3046\u98a8\u306b\u3059\u308b\u3067\u3057\u3087\u3046\u3002 lookup \"alice\" db >>= lookup \"city\" \u2192 Just \"Yokohama\" \u5de6\u3068\u53f3\u306e lookup \u306e\u4f7f\u3044\u65b9\u304c\u9055\u3046\u306e\u306f\u306a\u305c\u304b\u5e38\u3005\u7591\u554f\u3067\u3057\u2026"}