Re: Looping through a hash where some keys are the same

in reply to Looping through a hash where some keys are the same

Does anyone else find it surprising that each returns twice? I would have thought that the second assignment of the duplicate key would overwrite the original, and you only get one key/value pair back.

I appeal to the wise among you...

#!/usr/bin/perl
use Data::Dumper;

my %h = ( a => 1, a => 2 );

print Dumper \%h;

for ( my($k,$v) = each %h ) {
  print "$k -> $v\n";
}

__END__
$VAR1 = {
          'a' => 2
        };
a -> 2
a -> 2         # why?
[download]

Comment on Re: Looping through a hash where some keys are the same Select or Download Code

Replies are listed 'Best First'.
Re^2: Looping through a hash where some keys are the same by lidden (Curate) on Feb 18, 2005 at 10:42 UTC
`each` is returning a two element list, hence it is looping two times and $k, $v is only set once. It works as expected with a `while`. See "perldoc -f each".	[reply] [d/l] [select]
Re^3: Looping through a hash where some keys are the same by qq (Hermit) on Feb 18, 2005 at 11:10 UTC
I new I was overlooking something obvious - thanks.	[reply]

In Section Seekers of Perl Wisdom