how to compare 2 array

ab323i has asked for the wisdom of the Perl Monks concerning the following question:

Hello All, I have 2 arrays and I want to compare the elements of the first one for their existance in the second one. If they elements don't exist in the second array, print it to another array. If using strict, how do you pass the arrays out of the loops? Thank you for any information.

Comment on how to compare 2 array

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Re: how to compare 2 array by edan (Curate) on Oct 29, 2003 at 10:09 UTC
Categorized Questions and Answers QandASection: arrays How can I find the union/difference/intersection of two arrays? -- 3dan	[reply]
Re: how to compare 2 array by rnahi (Curate) on Oct 29, 2003 at 13:03 UTC
Using Super Search, you'll find that this problem has been asked and solved several times. A few good ones to consider: comparing arrays (with some talking of efficiency as well) Matching arrays	[reply]
Re: how to compare 2 array by Hena (Friar) on Oct 29, 2003 at 10:09 UTC
I would suggest making an hash from one array and testing that against the other (its a lot faster than what i could figure out with arrays). `# @array1 and @array2 are what are tested my %test; map {$test{$_}=undef} @array1; my @result; foreach (@array2) { push (@result,$_) if (exists($test{$_})); }` [download]	[reply] [d/l]