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.
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 };
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.
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
<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.
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