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问题描述
以下代码的输出始终为空.不知道我在做什么错,将不胜感激.如何获取散列数组中特定散列中的键的值?
The output of the code below is always empty. Not sure what I am doing wrong and would appreciate any help. How do I get to the values of a key in a specific hash in an array of hashes?
use strict;
use warnings;
my %dot1 = ('a'=>1,'b'=>2);
my %dot2 = ('a'=>3,'b'=>4);
my %dot3 = ('a'=>5,'b'=>6);
my %dot4 = ('a'=>7,'b'=>8);
my @array = (%dot1,%dot2,%dot3,%dot4);
my %x = $array[2];
my $y = $x->{'a'};
print "$y \n";
推荐答案
如果要使用散列引用数组,则需要这样明确地说明.
If you want an array of hash references, you need to say so explicitly.
my @array = (\%dot1, \%dot2, \%dot3, \%dot4);
my %x = %{$array[2]};
my $y = $x{a};
print "$y\n";
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