很絕的阿婆~~
keys - perldoc.perl.org有一位穿著簡陋的老太太去超級市場買了三罐貓罐頭, 正拿去結帳時, 結帳小姐說: 「老太太,妳必需把貓抱來,確定妳有養貓, 我才可以賣給妳,有些窮老人是會吃貓罐頭的!」 老太太沒辦法,就把貓抱來給結帳小姐看。 隔天,老太太又去超級市場買了三罐狗罐頭,正拿去結帳時Called in list context, returns a list consisting of all the keys of the named hash, or in Perl 5.12 or later only, the indices of an array. Perl releases prior to 5.12 will produce a syntax error if you try to use an array argument. In scalar context, re...
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