从散列中选择一个随机密钥 [英] Selecting a random key from a hash

问题描述

如何选择随机哈希键?对于 我的 Flash+Perl 纸牌游戏，我试图从哈希中随机选择一张纸牌其中键是:6 黑桃"、6 俱乐部"等，如下所示:

How do you select a random hash key? For my Flash+Perl card game I'm trying to pick a random card from a hash where keys are: "6 spades", "6 clubs", etc. like this:

my $card;
my $i = 0;
for $card (keys %{$user->{HAND}}) {
    last if rand(++$i) < 1;
}
delete $user->{HAND}->{$card};
print "random card: $card\n";

我想知道这是正确的方法还是有更好的方法.

I wonder if it's the correct way or if there is a better way.

推荐答案

更简洁:

my $random_value = $hash{(keys %hash)[rand keys %hash]};

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