{"type":"rich","version":"1.0","author_name":"papix","author_url":"https://blog.hatena.ne.jp/papix/","title":"\u5c0f\u30cd\u30bf: Test2\u3067\u30c6\u30b9\u30c8\u3092\u66f8\u304f\u6642\u306b, hash\u3084array\u306bundef\u304c\u3042\u308b\u3053\u3068\u3092U()\u3067\u30c6\u30b9\u30c8\u3059\u308b\u3068, \u306a\u3093\u304b\u610f\u56f3\u3057\u306a\u3044\u611f\u3058\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308b","blog_title":"Masteries","url":"https://papix.hatenablog.com/entry/2022/09/16/174129","published":"2022-09-16 17:41:29","image_url":null,"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fpapix.hatenablog.com%2Fentry%2F2022%2F09%2F16%2F174129\" title=\"\u5c0f\u30cd\u30bf: Test2\u3067\u30c6\u30b9\u30c8\u3092\u66f8\u304f\u6642\u306b, hash\u3084array\u306bundef\u304c\u3042\u308b\u3053\u3068\u3092U()\u3067\u30c6\u30b9\u30c8\u3059\u308b\u3068, \u306a\u3093\u304b\u610f\u56f3\u3057\u306a\u3044\u611f\u3058\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308b - Masteries\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","provider_url":"https://hatena.blog","provider_name":"Hatena Blog","height":"190","blog_url":"https://papix.hatenablog.com/","width":"100%","description":"\u307e\u305f\u307e\u305f\u307e\u305f\u307e\u305f\u5c0f\u30cd\u30bf\u3067\u3059. Perl\u306e\u30c6\u30b9\u30c8\u30e2\u30b8\u30e5\u30fc\u30eb\u3067\u3042\u308b\u3068\u3053\u308d\u306eTest2\u306b\u304a\u3044\u3066, U() \u306f undef \u3067\u3042\u308b\u3053\u3068\u3092\u30c6\u30b9\u30c8\u3057\u307e\u3059. is undef, U(); # => ok is 1, U(); # => not ok \u3067\u306f, \u30cf\u30c3\u30b7\u30e5\u3084\u914d\u5217\u306bundef\u304c\u3042\u308b\u3053\u3068\u3092\u30c6\u30b9\u30c8\u3057\u305f\u3044\u6642\u306f\u3069\u3046\u3059\u308b\u3068\u3044\u3044\u3067\u3057\u3087\u3046\u304b? my $array = [ 'a', undef ]; is $array, array { item 'a'; item U(); end; }; my $hash = { a => 1, b => undef }; is $hash, hash { field a =>\u2026","categories":[]}