Re: num keys of the hash within hash?


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Re: num keys of the hash within hash?

by muzakfetch (Scribe)

on May 26, 2009 at 17:09 UTC ( [id://766257]=note: print w/replies, xml )

Need Help??

in reply to num keys of the hash within hash?

Maybe this is what you're looking for:

#!/usr/bin/perl

use warnings;
use strict;

my $hashref = {
   first => {
       foo => bar,
       bar => baz,
       flop => floodle
   },
   second => {
       bar => foo,
       baz => bar,
       etc  => plodle
   }
};

foreach ( keys %{$hashref} ) {
   print $_ . " contains " . scalar(%{$hashref->{$_}) . " keys.\n";
}
[download]

keys returns a scalar of keys, which you can count with scalar. :-) edit: put a pretty space before keys :-)

Comment on Re: num keys of the hash within hash? Download Code

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Re^2: num keys of the hash within hash?
by AnomalousMonk (Archbishop) on May 26, 2009 at 18:20 UTC

>perl -wMstrict -le
"my $hashref = {
   first  => { foo => 'bar', bar => 'baz', flop => 'floodle' },
   second => { bar => 'foo', baz => 'bar', etc  => 'plodle'  },
   };
 foreach ( keys %{$hashref} ) {
   print qq{$_ contains } . scalar(%{$hashref->{$_}}) . qq{ keys.};
   }
"
first contains 3/8 keys.
second contains 3/8 keys.
[download]

proper string definitions of values of hashes;
scalar(%{$hashref->{$_}}) vice scalar(%{$hashref->{$_});
per Re^2: num keys of the hash within hash?, the stringization of a hash does not necessarily imply the number of keys of the hash.

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