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sub
Defining subroutines - video
Functions and Subroutines - video
Passing two arrays to a function
Python Lambda in Perl creating anonymous functions
Returning multiple values or a list from a subroutine in Perl
Subroutines and functions in Perl
The curious case of implicit return
Understanding recursive subroutines - traversing a directory tree
Variable number of parameters in Perl subroutines
String functions: length, lc, uc, index, substr
__SUB__
Lvalue substr - replace part of a string
Substr - video
substr outside of string at ...
Type constraint instead of subtype
Subscripts
substr
Creating subroutines on the fly using Symbolic references
Deep recursion on subroutine