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Mastering Modern Perl: Writing Efficient and Maintainable Code

Function Parameters

Explore how Perl functions accept and manipulate parameters through the array @_ , using techniques like shift, list assignment, and array operations. Understand best practices for accessing single or multiple arguments and passing leftover parameters with clarity and efficiency.

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The array of function parameters

A function receives its parameters in a single array, @_. Perl flattens all provided arguments into a single list when we invoke a function. The function must either unpack its parameters into variables or operate on @_ directly:

Perl
sub greet_one {
    my ($name) = @_;
    say "Hello, $name!";
}
sub greet_all {
    say "Hello, $_!" for @_;
}
greet_one('Sam', 'Ash');
greet_all('Sam', 'Ash');

Operations on function parameters

@_ ...