Use Array's Constructor : Introduction « Array « JavaScript Tutorial

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JavaScript Tutorial » Array » Introduction

11. 1. 2. Use Array's Constructor

Arrays stores multiple data based on a numbered position into one storage structure.

The index starts at 0 and goes up.

JavaScript supports having arrays within arrays, called multidimensional arrays.

One-Dimensional array

To create an instance of an array, you use the new operator along with the Array object.

There are four ways to declare an array.

First, an empty array can be created by leaving the constructor parameters empty:


var x = new Array();

The second way to create an array is to fill in the constructor parameters with the array elements.

An array can contain elements of various types:


var x = new Array("A","BB","CCC",1,5,8);

The third way to create an array is to fill in the constructor parameter with the size of the array.

This initializes the array to hold the number of elements specified, but does not specify the actual elements.


var x = new Array(6);

The fourth way to create an array is to use the array square brackets to fill in the array elements directly.


var x = ["A","BB","CCC",1,5,8];

11. 1. Introduction
	11. 1. 1.	Array's Constructor
	11. 1. 2.	Use Array's Constructor
	11. 1. 3.	Properties and Methods Used by the Array Object
	11. 1. 4.	Arrays as Objects
	11. 1. 5.	Creating an Array and Accessing Its Elements
	11. 1. 6.	Create an array using the Object() constructor
	11. 1. 7.	Methods Available in the Array Object
	11. 1. 8.	Delete an array element
	11. 1. 9.	Assign undefined value to an array element
	11. 1. 10.	Pass an array to a function
	11. 1. 11.	Return an array from a function

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