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Subroutines and functions in Perl
Exporting and importing functions easily
Passing two arrays to a function
Using the exiftool library from php (in place of native php function)
String functions: length, lc, uc, index, substr
Python Lambda in Perl creating anonymous functions
What return is expected from a function?
String functions: index - video
Memoization - speeding up function calls by caching of return values
Mocking function to fake environment
Functions and Subroutines - video
undef, the initial value and the defined function of Perl
Always require explicit importing of functions
$a - $b - Special variables when using sort(). Don't use them for anything else besides your sort function!
gettext function not found. Please install libintl at Makefile.PL
Methods, Functions and Subroutines in Perl and what is $self ?
Restrict the import by listing the functions to be imported
Does the 'all' function of List::MoreUtils really short-circuit?
How to return nothing (or undef) from a function in Perl?
Use the same sub as function or as method in Perl