Array() constructor

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

elementN

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.

arrayLength

If the only argument passed to the Array constructor is an integer between 0 and 2^32 - 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.

Arrays can be created using the literal notation:

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

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

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

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"

• Array class