Re: Hash substitution

[suaveant]

You can't change the key of a hash because the key decides how to find the data based on an algorithm.

You must instead move the value, easiest done this way:

$hash{newkey} = delete $hash{oldkey};

The delete removes the value from the old hash location and returns the value, allowing you to put it in the new hash location.

[Narveson]

use Data::Dumper;

my %hash = (
    apple  => 'red',
    orange => 'orange',
    banana => 'yellow',
);
my $old_key = 'orange';
my $new_key = 'carrot';

$hash{$new_key} = delete $hash{$old_key};

print Dumper(\%hash);