1// Class Inheritance in JavaScript
2class Mammal {
3	constructor(name) {
4		this.name = name;
5	}
6	eats() {
7		return `${this.name} eats Food`;
8	}
9}
10
11class Dog extends Mammal {
12	constructor(name, owner) {
13		super(name);
14		this.owner = owner;
15	}
16	eats() {
17		return `${this.name} eats Chicken`;
18	}
19}
20
21let myDog = new Dog("Spot", "John");
22console.log(myDog.eats()); // Spot eats chicken

1function inherit(c, p) {
2        Object.defineProperty(c, 'prototype', {
3            value: Object.assign(c.prototype, p.prototype),
4            writable: true,
5            enumerable: false
6        });
7
8        Object.defineProperty(c.prototype, 'constructor', {
9            value: c,
10            writable: true,
11            enumerable: false
12        });
13    }
14// Or if you want multiple inheritance
15
16function _inherit(c, ...p) {
17        p.forEach(item => {
18            Object.defineProperty(c, 'prototype', {
19                value: Object.assign(c.prototype, item.prototype),
20                writable: true,
21                enumerable: false
22            });
23        })
24
25        Object.defineProperty(c.prototype, 'constructor', {
26            value: c,
27            writable: true,
28            enumerable: false
29        });
30    }