在寻找一些指针时,关于如何按多个值对哈希数组进行排序,我遇到了以下解决方案：
Sorting array of hash by multiple keys.
Sorting array of hash by multiple keys.
但是,似乎无法想出一种动态地做到这一点的方法.
比如,如果要排序的参数(此处为：哈希键)的数量将取决于用户输入.
$arr_ref = [ { 'brand' => 'A','supplier' => 'X','PO' => '2'
},{ 'brand' => 'B','supplier' => 'Y','PO' => '1'
},'PO' => '2'
},{ 'brand' => 'A','PO' => '1'
},'PO' => '1'
}
].
用户可以通过“品牌”,“品牌”和“供应商”或所有三个来提供是否要对其进行排序.
解决方法
创建一个执行排序的子例程.它接受任意数量的键来进行比较：
use strict;
use warnings;
my @array = (
{ 'brand' => 'A','PO' => '2' },'PO' => '1' },);
sub custom_sort {
my ($x,$y,@keys) = @_;
for (@keys) {
my $cmp = $x->{$_} cmp $y->{$_};
return $cmp if $cmp;
}
return 0;
}
my @sorted = sort {custom_sort($a,$b,'brand','supplier','PO')} @array;
use Data::Dump;
dd @sorted;
输出：
(
{ brand => "A",PO => 1,supplier => "X" },{ brand => "A",PO => 2,{ brand => "B",supplier => "Y" },)