Though looking up a hash will often be better than doing a linear search along a list. For example:

#!/usr/bin/perl

use strict;
use warnings;

my %hoh = (
  flasha => { dd1 => 1, dd2 => 2, dd3 => 3, dd4 => 4 },
  flashb => { gg1 => 1, gg2 => 2, gg3 => 3, gg4 => 4 },
  flashc => { cc1 => 1, cc2 => 2, cc3 => 3, cc4 => 4 },
);

for ([qw(flasha dd4)], [qw(glashz gg2)], [qw(flashc zz)], [qw(flashc c
+c1)]) {
  my ($array_name, $to_find) = @$_ ;
  if (exists $hoh{$array_name}->{$to_find}) {
    print( "$array_name contains $to_find\n" );
  }
}

[download]
noting that exists stops looking, without complaint, if $hoh{$array_name} doesn't exist.

If the list is a trivial length, then List::Util::first at least stops looking when it gets a match.

I don't know what you need to do having discovered the match... the above allows you to map "array name" and "to_find" to anything you like -- the numbers above are for illustration, only !

If you're only interested in existence, then

   flasha => { map { ($_, undef) } qw(dd1 dd2 dd3 dd4) },

[download]
will serve.

In reply to Re^3: specific array in hash of arrays by gone2015
in thread specific array in hash of arrays by kwn

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