in the beginning, there was foo...

#!/usr/bin/perl -w
use strict;

my %foo = (
    camshaft   => 'lumpy',
    gearbox    => 'shifty',
    drivetrain => 'speedy',
    smokestack => 'dirty',
    lights     => 'bright eyes',
);

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but foo was alone. so bar was created.

my %bar;
@bar{ qw/camshaft gearbox1 the_drivetrain _other/ } = '';

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but bar was different... and empty. foo wants to understand bar, and a map was made...

my %map_foo_to_bar = (
    camshaft   => 'camshaft',
    gearbox    => 'gearbox1',
    drivetrain => 'the_drivetrain',
    smokestack => 'my_smokestack',
    junkyard   => '_junkyard',
);

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still, bar was empty, so along comes schlep to help...

sub schlep($$$)
{
    my( $map_ref, $from_ref, $to_ref ) = ( shift, shift, shift );
    for( keys %{ $from_ref } )
    {
        $to_ref->{ $map_ref->{$_} } = $from_ref->{$_}
            if( exists $map_ref->{$_} && exists $to_ref->{ $map_ref->{
+$_} } )
    }
}

schlep(\%map_foo_to_bar, \%foo, \%bar);

use Data::Dumper;
print Dumper \%bar;

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so it is written, so it shall be done.

~Particle ;Þ

In reply to Re: Bulk Hash Assignment by particle
in thread Bulk Hash Assignment by tadman

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