Implicit Ideas: The Default Array Variables
Explore how Perl manages function arguments with the implicit @_ array and handles command-line inputs using the @ARGV array. Understand how built-in functions operate on these arrays by default and how this behavior supports writing concise and flexible Perl programs.
We'll cover the following...
We'll cover the following...
Function arguments array: @_
Perl provides two implicit array variables. Perl passes arguments to functions in an array named @_. Array operations inside functions use this array by default. These two snippets of code are equivalent:
Just as $_ corresponds to the pronoun “it,” @_ corresponds to the pronouns “they” and “them.” Unlike $_, each function has a separate copy of @_. The built-ins shift and pop operate on @_, if provided no explicit operands.