ES2015 : Classes and Inheritance

es6-class.js

class Polygon {
	constructor(height, width) { // Class constructor
		this.name = 'Polygon';
		this.height = height;
		this.width = width;
	}

	sayName() { // Class method
		console.log('Hi, I am a', this.name + '.');
	}
}

class Square extends Polygon {
	constructor(length) {
		super(length, length); // Call the parent method with super
		this.name = 'Square';
	}

	get area() { // Calculated attribute getter
		return this.height * this.width;
	}
}

let s = new Square(5);

s.sayName();
console.log(s.area);