{"provider_name":"Hatena Blog","image_url":"https://cdn.user.blog.st-hatena.com/default_entry_og_image/42132/1577169589465165","height":"190","categories":["perl"],"url":"https://iww.hateblo.jp/entry/2021/06/28/123724","title":" perl\u3067\u3001\u771f\u507d\u5024\u306e\u623b\u308a\u5024","width":"100%","version":"1.0","provider_url":"https://hatena.blog","author_url":"https://blog.hatena.ne.jp/iww/","description":"perl\u3067\u3001\u3042\u3089\u304b\u3058\u3081\u5224\u5b9a\u3057\u3066\u304a\u3044\u305f\u771f\u507d\u5024\u3092\u5909\u6570\u306b\u5165\u308c\u3066\u304a\u3044\u3066 \u3042\u3068\u3067\u305d\u308c\u3092if\u6587\u3068\u304b\u3067\u53c2\u7167\u3059\u308b\u306e\u3063\u3066\u3069\u3046\u3084\u308b\u306e\u304c\u4e00\u822c\u7684\u306a\u3093\u3060\u308d\u3046 my %hoge; $hoge{a} = 1; my $boola = exists $hoge{a}; # \u771f my $boolb = exists $hoge{b}; # \u507d print(\"'$boola'\\n\"); # '1' print(\"'$boolb'\\n\"); # '' if($boola){ # \u2190\u306a\u3093\u304bIDE\u304c\u8b66\u544a Ambiguous condition \u3092\u51fa\u3057\u3066\u304f\u308b print \"HELLO\\n\"; } if(!!$boola){ # \u2190\u8b66\u544a\u306f\u2026","published":"2021-06-28 12:37:24","blog_title":"\u63ee\u767a\u6027\u306e\u30e1\u30e2\uff12","type":"rich","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fiww.hateblo.jp%2Fentry%2F2021%2F06%2F28%2F123724\" title=\" perl\u3067\u3001\u771f\u507d\u5024\u306e\u623b\u308a\u5024 - \u63ee\u767a\u6027\u306e\u30e1\u30e2\uff12\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","blog_url":"https://iww.hateblo.jp/","author_name":"iww"}