in reply to Call Subroutine with Variable

For the second half, you want to have a look at Dispatch Tables. The incomparable Higher Order Perl - Chapter 2 will explain you all.

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

In Section Seekers of Perl Wisdom