JavaScript Array: Create, Aceess and Methods

ArrayList and JavaScript, How to declare and store an ArrayList inside JavaScript, create an array in javascript, add item to javascript array, delete an item in an array in javascript, find an item in an array in javascript, these are the very basic question which most of the new developer searching for so I decided to write an articled to understand what is array in javascript and how it can be used with some easy examples.

The JavaScript Array global object is a constructor for arrays, which are high-level, list-like objects.

Create an array, and assign values to it:

var carType = new Array();
carType [0] = "Sedan";
carType [1] = "Coupe";
carType [2] = "Convertible";

OR

var carType = new Array("Sedan","Coupe","Convertible");

OR

var carType = ["Sedan","Coupe","Convertible"];

Access an Array element:

var sedan = carType[0];
var indexofCoupe =  carType.indexOf("Coupe"); // gives 1
// Change the value from Coupe to VAN
carType[1] = "VAN";    //or
carType[indexofCoupe ] = "VAN";

Concatenate all the elements of an array

var strArray = carType.join(', ');

Combine two array to create a single array

var arr1 = ['A', 'B', 'C'];
var arr2 = ['X', 'Y', 'Z'];
var finalArray = arr1.concat(arr2);

Combine three array to create a single array

var arr1 = ['A', 'B', 'C'];
var arr2 = ['X', 'Y', 'Z'];    
var arr3 = [1, 2, 3];
var finalArray = arr1.concat(arr2, arr3);

How to find an item in the array: Let's write a very simple function which accept the array and item to find the item in entier array

function FindItem(arr,item) {
    return (arr.indexOf(item) != -1);
}

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