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Re: how to sort hash of array by value

by FunkyMonk (Chancellor)
on Oct 01, 2007 at 22:06 UTC ( [id://642011]=note: print w/replies, xml ) Need Help??


in reply to how to sort hash of array by value

You forgot to sort it! 
use Data::Dumper;

my %colorhash = ( CCgray  => [ "0","0","0" ],
                  CCwhite => [ "1","0","0" ],
                  CCgrey  => [ "0","2","0" ],
                  CCBlue  => [ "0","0","3", ] );

my @light2dark = sort numsort (keys %colorhash);

print Dumper \@light2dark;

sub numsort {
    $colorhash{$a}[0] <=> $colorhash{$b}[0]
 or $colorhash{$a}[1] <=> $colorhash{$b}[1]
 or $colorhash{$a}[2] <=> $colorhash{$b}[2];
}

[download]

Output: 

$VAR1 = [
          'CCgray',
          'CCBlue',
          'CCgrey',
          'CCwhite'
        ];

[download]

Replies are listed 'Best First'.
Re^2: how to sort hash of array by value
by blkperl (Initiate) on Oct 01, 2007 at 22:51 UTC
    oops, but it still does not change the order based on the value. There is not change in the hash order.
[reply]
      The hash order is always random, and has nothing to do with the order in which that hash was created.

      Compare the following snippet with the original: 

      use Data::Dumper;

my %colorhash = ( CCgray  => [ "0","0","0" ],
                  CCwhite => [ "1","0","0" ],
                  CCgrey  => [ "0","2","0" ],
                  CCBlue  => [ "0","0","3", ] );

my @light2dark = keys %colorhash;

print Dumper \@light2dark;

      [download]

      PS Have you enclosed your original program within <code>...</code> tags yet?

[reply]
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