ClassInheritanceTutorial1 created by kenanhancer - https://repl.it/@kenanhancer/ClassInheritanceTutorial1

ClassInheritanceTutorial1.js

class Person {
	constructor(personId, firstName, lastName, age, gender) {
		this.personId = personId;
		this.firstName = firstName;
		this.lastName = lastName;
		this.age = age;
		this.gender = gender;
	}

	getFullName() {
		return `${this.firstName} ${this.lastName}`;
	}

	greet() {
		return `Hello ${this.getFullName()}`;
	}
}

class Employee extends Person {
	constructor(...args) {
		super(...args);

		let _title = args[5];
		let _salary = args[6];

		if (_title) {
			this.title = _title;
		}

		if (_salary) {
			this.salary = _salary;
		}

		this.taxRate = 0.14;
	}

	calculateGrossSalary() {
		let netSalary = this.calculateNetSalary();

		return netSalary * (1 + this.taxRate);
	}

	calculateNetSalary() {
		return this.salary * 12;
	}
}

class Manager extends Employee {
	constructor(...args) {
		super(...args);

		this.taxRate = 0.21;
	}

	greet() {
		let _greet = super.greet();

		return `${_greet}, Welcome!`;
	}
}

let employee1 = new Employee(1, 'Kenan', 'Hancer', 33, 'MALE', 'WORKER', 1000);

let manager1 = new Manager(2, 'Enes', 'Demir', 40, 'MALE', 'MANAGER', 5000);

console.log(employee1);

console.log(employee1.getFullName());

console.log(employee1.greet());

console.log(employee1.calculateNetSalary());

console.log(employee1.calculateGrossSalary());

console.log();

console.log(manager1);

console.log(manager1.getFullName());

console.log(manager1.greet());

console.log(manager1.calculateNetSalary());

console.log(manager1.calculateGrossSalary());