While countless methods exist to test for membership in the list, it is worthy to remember the obvious: when checking for elemenet 0, we should not forget to test using defined. Here is an example, this time using first from List::Util:

use List::Util 'first';

my @arr = (1..2, 0, 4);
my $num = 0;


defined first {$_==$num}  @arr
        and print 'found';
[download]