Perl Style: Use Hashes of Records, not Parallel Arrays

  • Learn to use hashes of records, and maintain array or hashes of these records, rather than using parallel arrays. Don’t do this:

        $age{"Jason"} = 23;
        $dad{"Jason"} = "Herbert";

    When you should do:

        $people{"Jason"}{AGE} = 23;
        $people{"Jason"}{DAD} = "Herbert";

    Or even: (note use of for here)

        for $his ($people{"Jason"}) {
            $his->{AGE} = 23;
            $his->{DAD} = "Herbert";

    But think very carefully before writing this:

        @{ $people{"Jason"} }{"AGE","DAD"} = (23, "Herbert");

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Copyright © 1998, Tom Christiansen All rights reserved.



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