http://www.perlmonks.org?node_id=939458


in reply to Re^2: Quicksort problem
in thread Quicksort problem

JediMasterT,
See perlop. The // operator essentially is a special or operator where it is testing the left hand side for definedness. I am pretty sure this became available in perl 5.10 four years ago but you can check perlhist and perldelta if you want to be sure.

Cheers - L~R