In JavaScript you can associate functions with objects. Here we will demonstrate how the constructor creates the object and assigns properties.
Object is a standalone entity, with properties and type in JavaScript. JavaScript objects can have properties, that define their characteristics.
Objects and properties:
An object in JavaScript has properties associated with this. So, a property of an object can be explained as a variable which is attached to an object. Thus, object properties are mostly the same as simple JavaScript variables, except for the attachment to objects.
JavaScript has a number of predefined objects. So, in addition, you can create your own objects.
Inheritance:
Objects in JavaScript are inherited from at least one other object.
So, the object which is being inherited from is known as a prototype, and the inherited properties can be found in the prototype object of a constructor.
Example,
var myCar = new Object(); myCar.make = "Nissan"; myCar.model = "N-54"; myCar.year = 1972;
Let’s now create a custom “toString()” method for our user object. We can embed the function directly in the object like this:
<script type="text/javascript">
function user(name, email) {
this.name = name;
this.email = email;
this.toString = function userToString() {
return("Name: "+this.name+" Email: "+this.email);
}
}
var obj = new user("John Doe","john.doe@example.com");
document.write(obj.toString());
</script>This produces:
Name: John Doe Email: john.doe@example.com
