Yes. Grep. 
my @a=('a' .. 'z');
print scalar grep {$_ eq "q"} @a;

[download]
...this is actually equivalent to a foreach loop, so don't do it for big arrays. There is no quick way to do that - if you must, use hashes instead. The above (last line) is more-or-less equivalent to: 
my @foo;
foreach (@a) {
  push @foo,$_ if ($_ eq "q");
}
print scalar @foo;

[download]
HTH.

Originally posted as a Categorized Answer.

In reply to Re: Like in hashes, do we have something like exists in arrays as well. by rjimlad
in thread Like in hashes, do we have something like exists in arrays as well. by rmalhotra

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