Day 11. Creating and Using Subroutines
We'll finish up your lesson on the core of the Perl language today with a discussion of subroutines, functions, and local variables. With subroutines you can collect bits of commonly used code into a single operation, and then perform that operation at different times in your script—the same way you use the built-in Perl functions.
The specific things you'll learn about include
The differences between user-defined subroutines and Perl's standard functions
How to define and call simple subroutines
Using variables local to subroutine definitions
Returning values from subroutines
Passing arguments to subroutines
Using subroutines in different contexts
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