That nested loop is the killer. How about a hash? The following code is untested and unoptimized but performs better algorithmically:

my %exclude;
@exclude{ @exclude } = ();

my @cleaned = grep { exists $exclude{ $_ } ? () : $_ } @words;

[download]

Update: Yep, I confused grep with map in my pre-breakfast haste. That should rather be:

my @cleaned = grep { ! exists $exclude{ $_ } } @words;

In reply to Re: Array Comparison by chromatic
in thread Array Comparison by mcogan1966

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