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Creating Functions

• Use the sub keyword to create a new function (subroutine):

  sub say_hi {
     print "Hello, world!\n";
  }
  

• "A subroutine (function, procedure, or subprogram) is a sequence of code which performs a specific task, as part of a larger program, and is grouped as one, or more, statement blocks." [Wikipedia]
• When given a name, the function can then be reused, just as you can reuse a piece of data by saving it as a named variable.
• Functions are used to wrap related parts of code together, to create re-usable software components and to give structure to your code.

Offer Kaye. YAPC::Israel::2005.
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