Re: How can I find the union/difference/intersection of two arrays?

⭐ in reply to How can I find the union/difference/intersection of two arrays?

This is inefficient, but I use it for intersection when I know I'm guaranteed small list sizes, and it's more valuable / pleasing to me to have a one-line solution:

my @isect = map { my $b = $_; grep { $_ eq $b } @a } @b;

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Re: Answer: How can I find the union/difference/intersection of two arrays? by Anonymous Monk on Nov 16, 2017 at 16:10 UTC
the problem with that method is that your @isect can contain identical elements for example,if @a=(1,2,3,4,2) and @b=(1,2,4), your @isect will be: (1,2,2,4) before using this method you have to make sure each element is unique in both tab	[reply]

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