Page 125 - JavaScript

Chapter 7: Arrow Functions

Introduction

Arrow functions are a concise way of writing anonymous, lexically scoped functions in ECMAScript
2015 (ES6).

Syntax

• x => y // Implicit return

• x => { return y } // Explicit return

• (x, y, z) => { ... } // Multiple arguments

• async () => { ... } // Async arrow functions

• (() => { ... })() // Immediately-invoked function expression

• const myFunc = x

=> x*2 // A line break before the arrow will throw a 'Unexpected token' error

• const myFunc = x =>

x*2 // A line break after the arrow is a valid syntax

Remarks

For more information on functions in JavaScript, please view the Functions documentation.

Arrow functions are part of the ECMAScript 6 specification, so browser support may be limited.
The following table shows the earliest browser versions that support arrow functions.

Chrome Edge Firefox Internet Explorer Opera Opera Mini Safari

45 12 22 Currently unavailable 32 Currently unavailable 10

Examples

Introduction

In JavaScript, functions may be anonymously defined using the "arrow" (=>) syntax, which is
sometimes referred to as a lambda expression due to Common Lisp similarities.

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