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Arrow functions

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Timm Friebe edited this page Oct 22, 2017 · 6 revisions

Arrow functions are shorter than function expressions and automatically capture variables from the containing scope without the need for an explicit use clause.

Basic syntax

(param1, param2, ... paramN) ==> expression
(param1, param2, ... paramN): returnType ==> expression

// Empty parameter lists are expressed by a pair of parentheses
() ==> expression
(): returnType ==> expression

// Parentheses are optional if there is only one parameter and no return type
param ==> expression

Motivation

Arrow functions allow for shorter and more concise syntax.

$materials->map(function($m) { return $m->length(); });

$materials->map($m ==> $m->length());

See also

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