JavaScript: Define class using class expressions

You can define a class using class expression also.

Syntax

var/let ClassName = class {

         //Class Body

}

var/let ClassName = class ClazzName{

         //Class Body

}

Exmaple 1:

var Employee = class {

  constructor(id, firstName, lastName){

    this.id = id;

    this.firstName = firstName;

    this.lastName = lastName;

  }

}

HelloWorld.js

var Employee = class {
  constructor(id, firstName, lastName){
    this.id = id;
    this.firstName = firstName;
    this.lastName = lastName;
  }
}

function print_employee_info(emp){
  console.log("id : " + emp.id);
  console.log("firstName : " + emp.firstName);
  console.log("lastName : " + emp.lastName);
}

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

print_employee_info(emp1);

Example 2

var Employee = class MyEmployee{

  constructor(id, firstName, lastName){

    this.id = id;

    this.firstName = firstName;

    this.lastName = lastName;

  }

}

HelloWorld.js

var Employee = class MyEmployee{
  constructor(id, firstName, lastName){
    this.id = id;
    this.firstName = firstName;
    this.lastName = lastName;
  }
}

function print_employee_info(emp){
  console.log("id : " + emp.id);
  console.log("firstName : " + emp.firstName);
  console.log("lastName : " + emp.lastName);
}

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

print_employee_info(emp1);

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