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Re: How to make an array from an array?

by barrd (Monsignor)
on Dec 06, 2003 at 14:47 UTC ( #312769=note: print w/ replies, xml ) Need Help??


in reply to How to make an array from an array?

Straight from Perl Cookbook (well almost :-)
my @all_names = qw/john andy bill andy john julia bill/; my %seen = (); my @names = grep { ! $seen{$_} ++ } @all_names; print join(' ', @names);
This prints john andy bill julia, I'm sure you'll get other variations.

Update 1: Fixed typos in code D'oh.

Update 2: As TomDLux rightly pointed out, you may wish to sort the names alphabetically, if so just change line 3 to this:

my @names = sort grep { ! $seen{$_} ++ } @all_names;
Returning: andy bill john julia (which is what I meant to do originally but ... err... didn't)

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