如何在值上对Perl哈希排序并相应地对键排序(可能在两个数组中)? [英] How can I sort a Perl hash on values and order the keys correspondingly (in two arrays maybe)?

问题描述

在Perl中，我想按数值对哈希键进行数字排序:

In Perl, I want to sort the keys of a hash by value, numerically:

{
  five => 5
  ten => 10
  one => 1
  four => 4
}

产生两个数组:

(1,4,5,10) and (one, four, five, ten)

然后我要对values数组进行规范化，以使数字是连续的:

And then I want to normalize the values array such that the numbers are sequential:

(1,2,3,4)

我该怎么做?

推荐答案

首先按关联值对键进行排序.然后获取值(例如，使用哈希切片).

First sort the keys by the associated value. Then get the values (e.g. by using a hash slice).

my @keys = sort { $h{$a} <=> $h{$b} } keys(%h);
my @vals = @h{@keys};

或者，如果您有哈希引用.

Or if you have a hash reference.

my @keys = sort { $h->{$a} <=> $h->{$b} } keys(%$h);
my @vals = @{$h}{@keys};

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