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Re^3: optimal way of comparing 2 arrays

by blazar (Canon)
on Oct 20, 2005 at 15:00 UTC ( [id://501688]=note: print w/replies, xml ) Need Help??


in reply to Re^2: optimal way of comparing 2 arrays
in thread optimal way of comparing 2 arrays

Then the solution above may be simplified to:
#!/usr/bin/perl -l use strict; use warnings; my @file1=qw/foo bar baz/; my @file2=qw/fred bar barney/; my %saw; $saw{$_}++ for @file1, @file2; print <<"EOT" \@file1 only: (@{[ grep $saw{$_}==1, @file1 ]}) \@file2 only: (@{[ grep $saw{$_}==1, @file2 ]}) common: (@{[ grep $saw{$_}==2, @file2 ]}) EOT __END__
or even, using modulo-2 math, but more obscurely:
#!/usr/bin/perl -l use strict; use warnings; my @file1=qw/foo bar baz/; my @file2=qw/fred bar barney/; my %saw; $saw{$_} ^= 1 for @file1, @file2; print <<"EOT" \@file1 only: (@{[ grep $saw{$_}, @file1 ]}) \@file2 only: (@{[ grep $saw{$_}, @file2 ]}) common: (@{[ grep !$saw{$_}, @file2 ]}) EOT __END__

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