Array.prototype.reverse()

The reverse() method reverses an array in place. The first array element becomes the last, and the last array element becomes the first.

Syntax

reverse()

Return value

The reversed array.

Description

The reverse method transposes the elements of the calling array object in place, mutating the array, and returning a reference to the array.

reverse is intentionally generic; this method can be called or applied to objects resembling arrays. Objects which do not contain a length property reflecting the last in a series of consecutive, zero-based numerical properties may not behave in any meaningful manner.

Examples

Reversing the elements in an array

The following example creates an array a, containing three elements, then reverses the array. The call to reverse() returns a reference to the reversed array a.

const a = [1, 2, 3];

console.log(a); // [1, 2, 3]

a.reverse();

console.log(a); // [3, 2, 1]

Reversing the elements in an array-like object

The following example creates an array-like object a, containing three elements and a length property, then reverses the array-like object. The call to reverse() returns a reference to the reversed array-like object a.

const a = {0: 1, 1: 2, 2: 3, length: 3};

console.log(a); // {0: 1, 1: 2, 2: 3, length: 3}

Array.prototype.reverse.call(a); //same syntax for using apply()

console.log(a); // {0: 3, 1: 2, 2: 1, length: 3}

Specifications

Specification
ECMAScript (ECMA-262)
The definition of 'Array.prototype.reverse' in that specification.

Browser compatibility

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See also