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Re: setting hash keys by array

by Shendal (Hermit)
on Sep 09, 2002 at 16:13 UTC ( #196328=note: print w/ replies, xml ) Need Help??

in reply to setting hash keys by array

How about something like this?
#!/usr/bin/perl -w use strict; use Data::Dumper; my @ary = qw(red green brown); my %hash = (); eval '$hash{' . join('}{',@ary) . '}++;'; print Dumper(\%hash);

That prints:
$VAR1 = { 'red' => { 'green' => { 'brown' => '1' } } };

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Re: Re: setting hash keys by array
by suaveant (Parson) on Sep 09, 2002 at 18:04 UTC
    This is probably not a great way to do it... not only is it inefficient and open to syntax errors (i.e. a key of ';}' would be bad), but if this was something that used user input it could be a security hole... ( @ary = '},`rm -rf /`,{' )

    eval is usually best used as a last resort and for exception handling (though this is usually with existing written code)

                    - Ant
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