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lib/Algorithm/Loops.pm  view on Meta::CPAN

    ... Filter( {y/aeiou/UAEIO/} @list );

may give you this error:

    Array found where operator expected

which can be fixed by dropping the parentheses:

    ... Filter {y/aeiou/UAEIO/} @list;

So if you need or want to use parentheses when calling Filter, it is best
to also include the C<sub> keyword and the comma:

    #         v <--------- These ---------> v
    ... Filter( sub {y/aeiou/UAEIO/}, @list );
    # require   ^^^ <--- these ---> ^ (sometimes)

so your code will be portable to more versions of Perl.

=head3 Examples