{"author_url":"https://blog.hatena.ne.jp/sakata_harumi/","url":"https://wanttobejk.com/entry/2018/06/13/003917","provider_url":"https://hatena.blog","blog_url":"https://wanttobejk.com/","categories":["Scala","Tech"],"title":"Cats\u306eState\u30e2\u30ca\u30c9\u3092\u4f7f\u3063\u3066FP in Scala\u306eEx6.11 \u81ea\u52d5\u8ca9\u58f2\u6a5f\u554f\u984c\u3092\u89e3\u304f (1)State\u30e2\u30ca\u30c9\u306b\u3064\u3044\u3066","height":"190","author_name":"sakata_harumi","published":"2018-06-13 00:39:17","version":"1.0","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwanttobejk.com%2Fentry%2F2018%2F06%2F13%2F003917\" title=\"Cats\u306eState\u30e2\u30ca\u30c9\u3092\u4f7f\u3063\u3066FP in Scala\u306eEx6.11 \u81ea\u52d5\u8ca9\u58f2\u6a5f\u554f\u984c\u3092\u89e3\u304f (1)State\u30e2\u30ca\u30c9\u306b\u3064\u3044\u3066 - JK\u306b\u306a\u308a\u305f\u3044\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","type":"rich","image_url":null,"width":"100%","provider_name":"Hatena Blog","blog_title":"JK\u306b\u306a\u308a\u305f\u3044","description":"State\u30e2\u30ca\u30c9\u306b\u3064\u3044\u3066\u3056\u3063\u304f\u308a\u3068\u3002 \u72b6\u614b\u306e\u5909\u5316\u3092\u4f34\u3046\u30df\u30e5\u30fc\u30bf\u30d6\u30eb\u306a\u8a08\u7b97\u3092Functional Programming\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3067\u8868\u73fe\u53ef\u80fd\u306b\u3057\u305f\u3082\u306e\u3002 cats\u306b\u304a\u3051\u308bState\u30e2\u30ca\u30c9\u306eapply\u30e1\u30bd\u30c3\u30c9\u306e\u30b7\u30b0\u30cd\u30c1\u30e3\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059 def apply[S, A](f: S => (S, A)): State[S, A] \u898b\u305f\u3068\u304a\u308a\u3001\u72b6\u614bS\u3092\u53d7\u3051\u53d6\u3063\u3066\u3001(S, A)\u3092\u8fd4\u3059\u95a2\u6570\u3092\u6e21\u3057\u307e\u3059\u3002 \u3053\u308c\u3060\u3051\u3067\u306f\u3055\u3063\u3071\u308a\u306a\u306e\u3067\u3001\u4f7f\u7528\u4f8b\u3092\u8003\u3048\u3066\u3044\u304d\u307e\u3059\u3002\u3002 \u4f8b\u306b\u793a\u3059\u306e\u306f\u4e71\u6570\u3092\u751f\u6210\u3059\u308b\u95a2\u6570\u3067\u3059\u3002 \u4e71\u6570\u751f\u6210\u306e\u305f\u3081\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u72b6\u614b\u3092\u6301\u3064\u305f\u3081\u3001\u4ee5\u4e0b\u306f\u5178\u578b\u7684\u306a\u53c2\u7167\u900f\u904e\u6027\u306e\u306a\u3044\u95a2\u6570\u3067\u3059\u3002 def cr\u2026"}