{"url":"https://morita-non.hatenadiary.org/entry/20151213/1450017519","blog_url":"https://morita-non.hatenadiary.org/","categories":[],"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmorita-non.hatenadiary.org%2Fentry%2F20151213%2F1450017519\" title=\"scala - memo\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","image_url":null,"width":"100%","title":"scala","blog_title":"memo","provider_url":"https://hatena.blog","description":"scala\u30b3\u30de\u30f3\u30c9\u306b\u3088\u308brepl\u3068scalac\u30b3\u30de\u30f3\u30c9\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u51fa\u6765\u308b\u30b3\u30fc\u30c9\u306b\u9055\u3044\u304c\u3042\u308b\uff1fNone\u3068\u304bnil\u5468\u308a\u3092\u81ea\u524d\u3067\u5b9a\u7fa9\u3059\u308b\u3088\u3046\u306a\u57fa\u672c\u7684\u306a\u30b3\u30fc\u30c9\u306f\u3001\u3042\u307e\u308arepl\u3067\u52d5\u304b\u306a\u3044\uff1fScala\u95a2\u6570\u578b\u30c7\u30b6\u30a4\u30f3\u306e\u672c\u306f\u3042\u307e\u308ascala\u30b3\u30de\u30f3\u30c9\u307d\u3061\u307d\u3061\u53e9\u304f\u4eba\u5411\u3051\u3067\u306f\u306a\u3044\u306e\u304b\u3082\u3057\u308c\u3093\u3002repl\u3067\u901a\u3089\u306a\u3044\u306e\u306f\u3001\u3053\u3093\u306a\u306e\u3002 package fpinscala.errorhandling sealed trait Option[+A] case class Some[+A](get :A) extends Option[A] case object None extends Option[Nothing] tr\u2026","author_name":"morita_non","author_url":"https://blog.hatena.ne.jp/morita_non/","provider_name":"Hatena Blog","type":"rich","height":"190","published":"2015-12-13 23:38:39","version":"1.0"}