JavaScript data type

string, number, Boolean, array, object, Null, Undefined

JavaScript Array

The following code creates an array named cars:

var cars=new Array ();
Cars[0]= "Audi";
Cars[1]= "BMW";
Cars[2]= "Volvo";

or (condensed array):

var cars=new Array ("Audi", "BMW", "Volvo");

or (literal array): instance

var cars=["Audi", "BMW", "Volvo"];

JavaScript Objects

Objects are delimited by curly braces. Within parentheses, the object's properties are defined in the form of name and value pairs (name:value). Properties are separated by commas:

var person={firstname: "Bill", LastName: "Gates", id:5566};

The object (person) in the example above has three properties: FirstName, LastName, and ID.

Spaces and folding lines are irrelevant. Declarations can span multiple lines:

var person={
FirstName: "Bill",
LastName  : "Gates",
ID        :  5566
};

There are two ways to address an object property: an instance

Name=person.lastname;
name=person["LastName"];

Everything in JavaScript is an object: A string, a number, an array, a date, and so on.