Prototypes
Learn about prototypes in Perl.
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A prototype is a piece of metadata attached to a function or variable. A function prototype changes how Perl’s parser understands it.
Prototypes allow us to define our own functions that behave like built-ins. Consider the built-in push, which takes an array and a list. While Perl would normally flatten the array and list into a single list passed to push, Perl knows to treat the array as a container and doesn't flatten its values. In effect, this is like passing a reference to an array and a list of values to push ...