If you insist on just wrapping grep in a subroutine... 
my $array = [ 1 .. 50 ];

sub mygrep {
  my( $guess, $array ) = @_;
  grep { $_ == $guess } @{$array};
}

print mygrep( 165, $array ) ? "True\n" : "False\n";

[download]
Enjoy! 
--
Casey
   I am a superhero.

In reply to RE: (more specific) Re: better way to find list members? by cwest
in thread better way to find list members? by jptxs

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