JavaScript Classes

Class is a blueprint or prototype that contains all of the data (variables and methods)

Advantages of classes

• Classes make it simple to maintain all of the data members and methods in one place.
• A class specifies how and what an object will contain.
• The class introduces the notion of data hiding (Encapsulation)
• It also supports the idea of Inheritance. Obtaining the characteristics and methods that allow cod e to be reused.

We use class keyword to define a class

Syntax

class ClassName {
    constructor() { ... }
 } 

The class syntax is composed of two parts:

• Class declarations
• Class expressions

Lets take an example of class

class EmpInfo {
    constructor(empId, empName) {
      this.empId = empId;
      this.empName = empName;
    }
  }

Lets create an object to call class

const obj = new EmpInfo(1701, "Torgal");

All together

class EmpInfo {
    constructor(empId, empName) {
      this.empId = empId;
      this.empName = empName;
    }
  }
  
  const obj = new EmpInfo(1701, "Torgal");
  console.log(obj.empId +" "+obj.empName)

Output

1701 Torgal