JavaScript Destructuring assignment
Introduction
Destructuring is a pattern matching technique that is added to Javascript recently in EcmaScript 6.
It allows you to bind a group of variables to a corresponding set of values when their pattern matches to the right hand-side and the left hand-side of the expression.
Syntax
- let [x, y] = [1, 2]
- let [first, ...rest] = [1, 2, 3, 4]
- let [one, , three] = [1, 2, 3]
- let [val='default value'] = []
- let {a, b} = {a: x, b: y}
- let {a: {c}} = {a: {c: 'nested'}, b: y}
- let {b='default value'} = {a: 0}
Remarks
Destructuring is new in the ECMAScript 6 (A.K.A ES2015) specification and browser support may be limited. The following table gives an overview of the earliest version of browsers that supported >75% of the specification.
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| 49 | 13 | 45 | x | 36 | x |
(Last Updated - 2016/08/18)
