Sub::PatMat - call a version of subroutine depending on its arguments

By Anton Berezin (‎Grrrr‎) from Copenhagen.pm
Lightning talk
Language:

The Sub::PatMat module provides the programmer with the ability
to define a subroutine multiple times and to specify what version
of the subroutine should be called, depending on the parameters
passed to it (or any other condition).