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Re: logic question

by Masem (Monsignor)
on Feb 14, 2002 at 19:10 UTC ( #145534=note: print w/ replies, xml ) Need Help??

in reply to logic question

Assuming that when you mean records, you have a single unique id value that is stored in the array, then you can do the usual trick of using a hash as a search mechanism:

my %temphash = map { $_ => 1 } @arrayA; my @inBbutnotA = grep { !$temphash{ $_ } } @arrayB;
If your record is more complicated, you have have to add another step to break out the unique id for either of these steps, but the idea is still the same.

Dr. Michael K. Neylon - || "You've left the lens cap of your mind on again, Pinky" - The Brain
"I can see my house from here!"
It's not what you know, but knowing how to find it if you don't know that's important

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