FunctionInheritanceTutorial1 created by kenanhancer - https://repl.it/@kenanhancer/FunctionInheritanceTutorial1

FunctionInheritanceTutorial1.js

let Person = function(personId, firstName, lastName, age, gender) {
	this.personId = personId;
	this.firstName = firstName;
	this.lastName = lastName;
	this.age = age;
	this.gender = gender;
};

Person.prototype.getFullName = function() {
	return `${this.firstName} ${this.lastName}`;
};

Person.prototype.greet = function() {
	return `Hello ${this.getFullName()}`;
};

let Employee = function() {
	let args = Array.prototype.slice.call(arguments);

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

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

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

	this.taxRate = 0.14;

	Person.apply(this, args);
};

//INHERITANCE
Employee.prototype = Object.create(Person.prototype);
Employee.prototype.constructor = Employee;

Employee.prototype.calculateGrossSalary = function() {
	let netSalary = this.calculateNetSalary();

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

Employee.prototype.calculateNetSalary = function() {
	return this.salary * 12;
};

let Manager = function() {
	let args = Array.prototype.slice.call(arguments);

	Employee.apply(this, args);

	this.taxRate = 0.21;
};

//INHERITANCE
Manager.prototype = Object.create(Employee.prototype);
Manager.prototype.constructor = Manager;

//OVERRIDE
Manager.prototype.greet = function() {
	let _greet = Employee.prototype.greet.call(this);
	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());