What is the purpose of ‘This’ operator in JavaScript?

Answer:

The JavaScript this keyword refers to the object it belongs to.
This has different values depending on where it is used. In a method, this refers to the owner object and in a function, this refers to the global object.
In an object method, this refers to the "owner" of the method.
In this example, this refers to the person object.

var person = { firstName: "Sonu", lastName : "Kumar", id : 3230, fullName : function() { return this.firstName + " " + this.lastName; } };