Summary
Perl supports user-definable functions, called subroutines or subs, that behave just like the built-in functions: They can take arguments, do work, and then return values to the caller if necessary. Perl subroutines can call other subroutines and even themselves. Perl also allows you to declare variables private to a subroutine (or any block of code) and create self-contained pieces of code that can then be reused.
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