A response to the "wiz bang" question

(Ryan Byrd)[http://www.ryanbyrd.net/techramble/] blogged recently with a (programming interview question)[http://www.ryanbyrd.net/techramble/2009/03/03/programming-interview-question-of-the-day/] that I thought I’d take a stab at in Perl.

The question is as follows:

• when passed in a number that is evenly divisible by 3, return “wiz”
• when passed in a number that is evenly divisible by 5, return “bang”
• when passed in a number that is evenly divisible by both 3 and 5, return “wiz bang”
• otherwise, return the number passed in

My solution exploits Perl’s list type to store potential output as a queue of sorts.

sub function {
    my $num = shift;
    my @output = ();
    unless($num % 3) {    push @output, "wiz"; }
    unless($num % 5 ) {    push @output, "bang"; }
    if(@output) {   return join ' ', @output; }
    return $num; 
}