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Re: Getting Keys of Hash from Values

by tmoertel (Chaplain)
on Nov 16, 2005 at 21:20 UTC ( #509203=note: print w/replies, xml ) Need Help??

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  1. or download this
    my %hash          = ( a => 1, b => 2, c => 3 );
    my %inverted_hash = reverse %hash;
    
  2. or download this
    use Data::Dumper;
    print Dumper(\(%hash, %inverted_hash));
    ...
    #           '3' => 'c',
    #           '2' => 'b'
    #         };
    
  3. or download this
    %hash          = ( a => 1, b => 2, c => 2 );
    %inverted_hash = reverse %hash;
    ...
    #           '1' => 'a',
    #           '2' => 'c'
    #         };
    
  4. or download this
    print "keys were lost during inversion\n"
        if keys %inverted_hash < keys %hash;
    

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