How to create array in Javascript

Javascript arrays are ordered lists of data and can hold any type of data in each slot.

Arrays in Javascript are dynamically sized, automatically growing.

Arrays can be created in two ways.

The following code uses the Array constructor.

var colors = new Array();

You can pass the count into the constructor, and the length property will set to that value.

var colors = new Array(20);

You can pass items to Array constructor.

var colors = new Array("red", "blue", "green");

It's OK to omit the new operator when using the Array constructor.


var colors = Array(3);      //create an array with three items
var names = Array("red");   //create an array with one item, the string "red"

An array literal includes square brackets and a comma-separated list of items.


var colors = ["red", "blue", "green"]; //creates an array with three strings
var names = [];                        //creates an empty array

You can enumerate the content of an array using a for loop.


var myArray = [ 100, "A", true ];
for ( var i = 0; i < myArray.length; i++) {
  console.log("Index " + i + ": " + myArray[i]);
}

The code above generates the following result.