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JavaScript Objects
A javaScript object is an entity having state and behavior (properties and method). For example: car, pen, bike, chair, glass, keyboard, monitor etc.
JavaScript is an object-based language. Everything is an object in JavaScript.
JavaScript is template based not class based. Here, we don't create class to get the object. But, we direct create objects.
JavaScript is an Object Oriented Programming (OOP) language. A programming language can be called object-oriented if it provides four basic capabilities to developers −
• Encapsulation − the capability to store related information, whether data or methods, together in an object.
• Aggregation − the capability to store one object inside another object.
• Inheritance − the capability of a class to rely upon another class (or number of classes) for some of its properties and methods.
• Polymorphism − the capability to write one function or method that works in a variety of different ways.
Objects are composed of attributes. If an attribute contains a function, it is considered to be a method of the object, otherwise the attribute is considered a property.
Object Properties
Object properties can be any of the three primitive data types, or any of the abstract data types, such as another object. Object properties are usually variables that are used internally in the object's methods, but can also be globally visible variables that are used throughout the page.
The syntax for adding a property to an object is −
objectName.objectProperty = propertyValue;
For example − The following code gets the document title using the "title" property of the document object.
Creating Objects in JavaScript
There are 3 ways to create objects.
1. By object literal
2. By creating instance of Object directly (using new keyword)
3. By using an object constructor (using new keyword)
________________________________________
1) JavaScript Object by object literal
The syntax of creating object using object literal is given below:
1. object={property1:value1,property2:value2.....propertyN:valueN}
As you can see, property and value is separated by : (colon).
Let’s see the simple example of creating object in JavaScript.
1. script
2. emp={id:102,name:"Shyam Kumar",salary:40000}
3. document.write(emp.id+" "+emp.name+" "+emp.salary);
4. /script
Output of the above example
102 Shyam Kumar 40000

var str = document.title;
Object Methods
Methods are the functions that let the object do something or let something be done to it. There is a small difference between a function and a method – at a function is a standalone unit of statements and a method is attached to an object and can be referenced by the this keyword.
Methods are useful for everything from displaying the contents of the object to the screen to performing complex mathematical operations on a group of local properties and parameters.
For example − Following is a simple example to show how to use the write() method of document object to write any content on the document.
document.write("This is test");
2) By creating instance of Object
The syntax of creating object directly is given below:
1. var objectname=new Object();
Here, new keyword is used to create object.
Let’s see the example of creating object directly.
1. script
2. var emp=new Object();
3. emp.id=101;
4. emp.name="Ravi Malik";
5. emp.salary=50000;
6. document.write(emp.id+" "+emp.name+" "+emp.salary);
7. /script
Output of the above example
101 Ravi 50000