Perl, convert hash to array

Question

If I have a hash in Perl that contains complete and sequential integer mappings (ie, all keys from from 0 to n are mapped to something, no keys outside of this), is there a means of converting this to an Array?

I know I could iterate over the key/value pairs and place them into a new array, but something tells me there should be a built-in means of doing this.

Answer 1

If your original data source is a hash:

# first find the max key value, if you don't already know it: use List::Util 'max'; my $maxkey = max keys %hash;  # get all the values, in order my @array = @hash{0 .. $maxkey}; 

Or if your original data source is a hashref:

my $maxkey = max keys %$hashref; my @array = @{$hashref}{0 .. $maxkey}; 

---

This is easy to test using this example:

my %hash; @hash{0 .. 9} = ('a' .. 'j');  # insert code from above, and then print the result... use Data::Dumper; print Dumper(\%hash); print Dumper(\@array);  $VAR1 = {           '6' => 'g',           '3' => 'd',           '7' => 'h',           '9' => 'j',           '2' => 'c',           '8' => 'i',           '1' => 'b',           '4' => 'e',           '0' => 'a',           '5' => 'f'         }; $VAR1 = [           'a',           'b',           'c',           'd',           'e',           'f',           'g',           'h',           'i',           'j'         ];