{"provider_name":"Hatena Blog","url":"https://hiratara.hatenadiary.jp/entry/20130530/1369929231","description":"\u570f\u8ad6\u52c9\u5f37\u4f1a \u7b2c3\u56de\u306e\u81ea\u7531\u5bfe\u8c61\u3067\u60b2\u9cf4\u304c\u4e0a\u304c\u3063\u3066\u305f\u3088\u3046\u306a\u306e\u3067\u3001\u53c2\u8003\u307e\u3067\u306b\u56f3\u306b\u66f8\u3044\u3066\u8aac\u660e\u3057\u3066\u304a\u304f\u3002\u307e\u305a\u3001\u30de\u30b0\u30de\u3068\u81ea\u7531\u30de\u30b0\u30de\u3092\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3059\u308b(\u3068\u3044\u3046\u304b\u3001\u52c9\u5f37\u4f1a\u306b\u304a\u3044\u3066\u3053\u3046\u5b9a\u7fa9\u3057\u3066\u3044\u305f)\u3002 class Magma a where magappend :: a -> a -> a data FreeMagma a = Leaf a | Node (FreeMagma a) (FreeMagma a) deriving Show instance Magma (FreeMagma a) where x `magappend` y = Node x y \u3053\u306eFreeMagma\u304c\u81ea\u7531\u5bfe\u8c61\u3068\u3044\u3046\u6027\u8cea\u3092\u6301\u3064\u4e8b\u2026","provider_url":"https://hatena.blog","published":"2013-05-30 00:53:51","categories":["\u6570\u5b66","\u6280\u8853"],"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhiratara.hatenadiary.jp%2Fentry%2F20130530%2F1369929231\" title=\"\u81ea\u7531\u30de\u30b0\u30de\u3092\u81ea\u7531\u5bfe\u8c61\u306e\u5b9a\u7fa9\u306e\u56f3\u3067\u66f8\u304f\u3068 - Pixel Pedals of Tomakomai\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","height":"190","image_url":"https://cdn-ak.f.st-hatena.com/images/fotolife/h/hiratara/20130531/20130531004557.png","version":"1.0","author_url":"https://blog.hatena.ne.jp/hiratara/","width":"100%","title":"\u81ea\u7531\u30de\u30b0\u30de\u3092\u81ea\u7531\u5bfe\u8c61\u306e\u5b9a\u7fa9\u306e\u56f3\u3067\u66f8\u304f\u3068","blog_title":"Pixel Pedals of Tomakomai","author_name":"hiratara","blog_url":"https://hiratara.hatenadiary.jp/","type":"rich"}