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