in reply to Re^3: How to create a hash whose values are undef?
in thread How to create a hash whose values are undef?

Great! I like your thinking, but you should be aware that "0" and even "" is not the same as "undef". 
#!/usr/bin/perl -w
use strict;
use Data::Dumper;

my @keys = (1,2,3);
my %hash;
@hash{@keys} = (undef) x @keys;

print Dumper \%hash;
__END__
Prints:
$VAR1 = {
          '1' => undef,
          '3' => undef,
          '2' => undef
        };

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Re^5: How to create a hash whose values are undef?
by cdarke (Prior) on Jul 07, 2009 at 07:36 UTC
    Exactly (that's why I said "some other value").
    Otherwise it could be done thus:
    my %hash;
@hash{@keys} = undef;

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    No need for the x operator. This sets the first value to undef, the others are unspecified so are set to undef as well.
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[d/l]

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