JavaScript extend demo

es5.js

function People (name) {
	this.name = name;
}
People.prototype.getName = function() {
	return this.name;
}

function Student(name) {
	People.call(this, name);
	this.learn = function() {
		console.log(`Student ${this.getName()} is learning`);
	}
}
Student.prototype = Object.create(People.prototype);
Student.prototype.constructor = Student;

function CollegeStudent(name, department) {
	Student.call(this, name);
	this.department = department;
	this.learn = function() {
		console.log(`College student ${this.getName()} from ${this.department} is learning`);
	}
	this.goLibrary = function() {
		console.log(`College student ${this.getName()} go to library`);
	}
}
CollegeStudent.prototype = Object.create(Student.prototype);
CollegeStudent.prototype.constructor = CollegeStudent;

function MiddleSchoolStudent(name, grade) {
	Student.call(this, name);
	this.grade = grade;
}
MiddleSchoolStudent.prototype = Object.assign(Object.create(Student.prototype), {
	constructor: MiddleSchoolStudent,
	learn: function() {
		console.log(`Middle school student ${this.getName()} from grade ${this.department} is learning`);
	}
});


var p1 = new CollegeStudent("Jack", "CS");
console.log(p1.getName());
p1.goLibrary();

var p2 = new MiddleSchoolStudent("Jason", 1);
console.log(p2.getName());
p2.learn();

es6.js

class People {
	constructor(name) {
		this.name = name;
	}
	getName() {
		return this.name;
	}
}

class Student extends People {
	constructor(name) {
		super(name);
	}
	learn() {
		console.log(`Student ${this.getName()} is learning`);
	}
}

class CollegeStudent extends Student {
	constructor(name, department) {
		super(name);
		this.department = department;
	}
	learn() {
		console.log(`College student ${this.getName()} from ${this.department} is learning`);
	}
	goLibrary() {
		console.log(`College student ${this.getName()} go to library`);
	}
}

var p = new CollegeStudent("Jack");
console.log(p.getName());
p.goLibrary();

es6_getter.js

class Demo {
	get name() {
		return this._name;
	}
	set name(v) {
		this._name = v.substr(0, 5);
	}
}

var d = new Demo();
d.name = 'Jackson';
console.log(d.name);