JavaScript is an Object Oriented Programming i.e. OOP language. It provides four basic capabilities i.e. Encapsulation, Aggregation, Inheritance and Polymorphism.
For example as a car. It has properties like weight and color and and methods like start and stop. So, all cars have same properties, but the values differ from one car to another.
Object Properties:
Syntax for adding a property to an object:
objectName.objectProperty = propertyValue;
var car = {
type:"Nissan",
model:"F100",
color:"Black"
};
So, the name:values pairs are called properties.
var person = {
firstName:"John",
lastName:"Doe",
age:35
};
Object Methods:
Methods are like actions which can be performed on objects. This is attached to an object and can be referenced by the “this” keyword.
For example:
document.write("Hello Dolly!");This is write() method of document object to write any content.
How to access:
Using two ways you can access object properties.
1. objectName.propertyName
2. objectName[“propertyName”]
Let’s see another example:
This is how to create an object and assign the value in it.
<script type="text/javascript"> var book = new Object(); book.subject = "JavaScript"; book.author = "Mr. Dunga"; </script>
And this is how to access the object value.
<script type="text/javascript">
document.write("Name : " + book.subject + "<br>");
document.write("Author : " + book.author + "<br>");
</script>
Output:
Name : JavaScript
Author : Mr. Dunga
Read Also: JavaScript Browsers Handling
Use Methods for an Object:
<script type="text/javascript">
function addPrice(amount){
this.price = amount;
}
function car(name, model){
this.name = name;
this.model = model;
this.addPrice = addPrice;
}
var myCar = new car("Nissan", "N-100");
myCar.addPrice(45000);
document.write("Name : " + myCar.name + "<br>");
document.write("Model : " + myCar.model + "<br>");
document.write("Price : " + myCar.price + "<br>");
</script>
Output:
Name : Nissan
Model : N-100
Price : 45000
Based on United States, Jacob Frazier is a skilled JavaScript developer with over 8 years of experience. He is passionate about change and trying new things, both professionally and personally. He loves startups and is extremely proactive.