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Array.of

The Array.of() method creates a new Array instance from a variable number of arguments, regardless of number or type of the arguments.

The difference between Array.of() and the Array constructor is in the handling of integer arguments: Array.of(7) creates an array with a single element, 7, whereas Array(7) creates an empty array with a length property of 7 (Note: this implies an array of 7 empty slots, not slots with actual undefined values).

Array.of(7);       // [7] 
Array.of(1, 2, 3); // [1, 2, 3]

Array(7);          // array of 7 empty slots
Array(1, 2, 3);    // [1, 2, 3]

Syntax

Array.of(element0[, element1[, ...[, elementN]]])

Parameters

elementN
Elements used to create the array.

Return value

A new Array instance.

Description

This function is part of the ECMAScript 2015 standard.

For more information, see:

Polyfill

Running the following code before any other code will create Array.of() if it's not natively available.

if (!Array.of) {
  Array.of = function() {
    return Array.prototype.slice.call(arguments);
    // Or 
    let vals = [];
    for(let prop in arguments){
        vals.push(arguments[prop]);
    }
    return vals;
  }
}

Examples

Using Array.of

Array.of(1);         // [1]
Array.of(1, 2, 3);   // [1, 2, 3]
Array.of(undefined); // [undefined]

Specifications

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
of 45 12 25 No 26 9
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
of 39 39 25 26 9 4.0
Server
Node.js
of 4.0.0

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/of