This is an automatically generated page and cannot be edited directly. Text in Composite pages, (URLs starting with 'routine' or 'syntax') can be edited by clicking on the link labeled 'in context', and editing the text there.

Exit this popup by pressing <Escape>, or clicking on X or on the background.

Arity
Combined from primary sources listed below.

In Glossary§

See primary documentation in context for Arity.

The number of Positional operands expected by an operator, subroutine, method or callable block.

sub infix:<+>(Foo $a, Foo $b) { $a.Int + $b.Int }  # arity of "+" is 2
sub frobnicate($x) { ... }                         # arity of 1
sub the-answer() { 42 }                            # arity of 0
-> $key, $value { ... }                            # arity of 2

The arity of a Callable is one of the main selectors in multi-dispatch.