{"categories":["groovy"],"author_url":"https://blog.hatena.ne.jp/moznion/","blog_url":"https://moznion.hatenadiary.com/","description":"\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306b\u30e1\u30bd\u30c3\u30c9\u3092\u751f\u3084\u3059 class EmptyCat {} def cat = new EmptyCat() cat.metaClass.nyan = { return 'meow' } cat.nyan() // => 'meow' \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e metaClass \u304b\u3089MetaClass (HandleMetaClass) \u3092\u5f15\u3063\u5f35\u3063\u3066\u304d\u3066\uff0c\u305d\u308c\u7d4c\u7531\u3067\u751f\u3084\u3057\u305f\u3044\u30e1\u30bd\u30c3\u30c9\u306e\u540d\u524d\u3092\u6307\u5b9a\u3057\uff0cClosure\u3092\u4ee3\u5165\u3057\u3066\u3084\u308b\u3068\u826f\u3044\uff0e \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u751f\u3084\u3059 \u4e0a\u8a18\u304c\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u81ea\u4f53\u306b\u30e1\u30bd\u30c3\u30c9\u3092\u751f\u3084\u3057\u3066\u3044\u305f\u306e\u306b\u5bfe\u3057\uff0c\u3053\u3061\u3089\u306f\u30af\u30e9\u30b9\u306b\u5bfe\u3057\u3066\u30e1\u30bd\u30c3\u30c9\u8ffd\u52a0\u306e\u51e6\u7406\u3092\u884c\u3044\uff0c\u305d\u306e\u30af\u30e9\u30b9\u304cinsta\u2026","provider_name":"Hatena Blog","version":"1.0","type":"rich","width":"100%","provider_url":"https://hatena.blog","title":"Groovy\u3067\u52d5\u7684\u306b\u30e1\u30bd\u30c3\u30c9\u3092\u751f\u3084\u3059","height":"190","image_url":null,"published":"2017-09-25 00:27:48","author_name":"moznion","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmoznion.hatenadiary.com%2Fentry%2F2017%2F09%2F25%2F002748\" title=\"Groovy\u3067\u52d5\u7684\u306b\u30e1\u30bd\u30c3\u30c9\u3092\u751f\u3084\u3059 - \u305d\u306e\u624b\u306e\u5e73\u306f\u5c3b\u3082\u3064\u304b\u3081\u308b\u3055\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","url":"https://moznion.hatenadiary.com/entry/2017/09/25/002748","blog_title":"\u305d\u306e\u624b\u306e\u5e73\u306f\u5c3b\u3082\u3064\u304b\u3081\u308b\u3055"}