Array() constructor

The Array() constructor is used to create Array objects.


[element0, element1, ..., elementN]

new Array(element0, element1[, ...[, elementN]])
new Array(arrayLength)


A JavaScript array is initialized with the given elements, except in the case where a single argument is passed to the Array constructor and that argument is a number (see the arrayLength parameter below). Note that this special case only applies to JavaScript arrays created with the Array constructor, not array literals created with the bracket syntax.
If the only argument passed to the Array constructor is an integer between 0 and 232-1 (inclusive), this returns a new JavaScript array with its length property set to that number (Note: this implies an array of arrayLength empty slots, not slots with actual undefined values). If the argument is any other number, a RangeError exception is thrown.


Array literal notation

Arrays can be created using the literal notation:

let fruits = ['Apple', 'Banana'];

console.log(fruits.length); // 2
console.log(fruits[0]);     // "Apple"

Array constructor with a single parameter

Arrays can be created using a constructor with a single number parameter. An array with its length property set to that number and the array elements are empty slots.

let fruits = new Array(2);

console.log(fruits.length); // 2
console.log(fruits[0]);     // undefined

Array constructor with multiple parameters

If more than one argument is passed to the constructor, a new Array with the given elements is created.

let fruits = new Array('Apple', 'Banana');

console.log(fruits.length); // 2
console.log(fruits[0]);     // "Apple"


Specification Status
ECMAScript Latest Draft (ECMA-262)
The definition of 'Array constructor' in that specification.

Browser compatibility

No compatibility data found. Please contribute data for "javascript.builtins.Array.Array" (depth: 1) to the MDN compatibility data repository.

See also