JavaScript: Adding prototype methods to class

You can add prototype methods (methods that are available to all the objects) to a class.

var Employee = class MyEmployee{

  constructor(id, firstName, lastName){

    this.id = id;

    this.firstName = firstName;

    this.lastName = lastName;

  }

 

  print_employee_info(){

    console.log("id : " + this.id);

    console.log("firstName : " + this.firstName);

    console.log("lastName : " + this.lastName);

  }

}

For example, I added print_employee_info method to the class Employee. Observe above snippet, I am not added function keyword (function keyword is not required) to the method print_employee_info() method.

Find the below working example.

HelloWorld.js

var Employee = class MyEmployee{
  constructor(id, firstName, lastName){
    this.id = id;
    this.firstName = firstName;
    this.lastName = lastName;
  }
  
  print_employee_info(){
    console.log("id : " + this.id);
    console.log("firstName : " + this.firstName);
    console.log("lastName : " + this.lastName);
  }
}

var emp1 = new Employee(1, "Sailaja", "PTR");

emp1.print_employee_info();

Output

id : 1

firstName : Sailaja

lastName : PTR

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