Does hash contain minimum keys?

Testing a hash to see if it has values for all required keys. Extraneous keys are okay.

use strict;
use warnings;
use Test::More tests => 3;

my (%required,%over,%under,%partial);
$required{$_} = 1 for qw/header detail trailer/;

$over{$_} = $_ for qw/title header subject detail trailer postscript/;
$under{$_} = $_ for qw/header trailer/;
$partial{$_} = $_ for qw/header trailer/;
$partial{detail} = undef;

ok(test_it(%over),'checking %over for required keys');
ok(test_it(%under),'checking %under for required keys');
ok(test_it(%partial),'checking %partial for required keys');

sub test_it {
  my %h = @_;
#  return (grep {$required{$_} && $h{$_}} keys %h) == (keys %required)
+;
   return (grep {$required{$_} && defined $h{$_}} keys %h) == (keys %r
+equired);
}
[download]

Update: use of defined suggested by choroba. I would have run into this because 0 is a value I would encounter.

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Comment on Does hash contain minimum keys? Download Code

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Re: Does hash contain minimum keys? by choroba (Cardinal) on Nov 11, 2016 at 17:24 UTC
Maybe add a defined after the `&&` if zero is a valid value? See also HASH COMPARISONS in Test::Deep . ($q=q:Sq=~/;[c](.)(.)/;chr(-\|\|-\|5+lengthSq)`"S\|oS2"`map{chr \|+ord }map{substrSq`S_+\|`\|}3E\|-\|`7**2-3:)=~y+S\|`+$1,++print+eval$q,q,a, [download]	[reply] [d/l] [select]
Re: Does hash contain minimum keys? by emshach (Initiate) on Dec 13, 2016 at 21:46 UTC
In this example `%required` doesn't need to be a hash, and since that's what you're checking against, that's what you should search. You could also use prototyping to avoid building a whole new hash each time, so we'd end up with something like: `sub test_it (\%) { my ($h) = @_; return (keys (%$h) >= @required && !grep { !defined($h->{$_}) } @required); # return true if the list of missing required keys is empty }` [download]	[reply] [d/l] [select]


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