A better structure for the type of search you want is a hash

After

my %available_things= map { $_,1} @available_things;

[download]

your search is a simple lookup:

@not_available_requested_things = map { $_ if not $available_things{$_
+} } @requested_things;

[download]

In reply to Re: Matching array elements not in another array by jethro
in thread Matching array elements not in another array by loris

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