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The stupid question is the question not asked

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( #3333=superdoc: print w/replies, xml ) Need Help??
my solution:
use strict; use warnings; my %replaces = ( "foo" => { 'W100' => 'W102', 'W101' => 'W103', }, "bar" => { 'W120' => 'W99', 'W121' => 'W104', }, ); my $expr = join '|', map {keys %$_} values %replaces; print $expr;

(similar to ikegami's but DRYer)

There are multiple issues with your code:

  • your data structure was buggy since it swaps ( with {
  • your my $expr is scoped° to the loop, hence undef outside
  • $expr = will be overwritten with each iteration

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

°) kind of, strict doesn't complain.

In reply to Re: One-liner to join keys on a two-dimensionnal hash ? by LanX
in thread One-liner to join keys on a two-dimensionnal hash ? by Anonymous Monk

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