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Subroutines and functions in Perl
How to return nothing (or undef) from a function in Perl?
What return is expected from a function?
Generate random numbers in Perl with the rand() function
undef, the initial value and the defined function of Perl
String functions: length, lc, uc, index, substr
Passing two arrays to a function
Attribute::Handlers to wrap a function
Methods, Functions and Subroutines in Perl and what is $self ?
Exporting and importing functions easily
Use the same sub as function or as method in Perl
Memoization - speeding up function calls by caching of return values
Using the exiftool library from php (in place of native php function)
Functions and Subroutines - video
Mocking function to fake environment
Restrict the import by listing the functions to be imported
String functions: index - video
Does the 'all' function of List::MoreUtils really short-circuit?
Python Lambda in Perl creating anonymous functions
Passing multiple parameters to a function in Perl