Code shows four ways of creating an object in JavaScript

fourwaysofcreatingobjectinjs.js

// Fours ways of creating an object in JavaScript 


// 1. object as a literal

var car = {
    model: 'bmw',
    color: 'red',
    price: 2000,
    engine : {
    	type :'petrol',
    	power : 120
    }
}

car.owner = 'foo';


Object.defineProperty(car, "yearmade", {
    writable: true,
    enumerable: true,
    configurable: false,
    value: 1984
});

console.log(JSON.stringify(car));

// 2. using the new operator a.k.s Constructor Invocation Pattern


 
function Car(model, color) {
    this.model = model;
    this.color = color;
    Object.defineProperty(this, "yearmade", {
    writable: true,
    enumerable: true,
    configurable: false,
    value: 1984
});

}

console.log(Car.prototype);

var c1 = new Car('BMW','Red');
var c2 = new Car('Audi','Black');
console.log(c1.yearmade);

// 3 using the Object.create() method 

//it allows you to create an object from an existing object 

var Car1 = {
    model: 'BMW',
    color: 'red'
}

var ElectricCar = Object.create(Car1,{ym:{
	writable: true,
    enumerable: true,
    configurable: false,
    value: 1984
}});
//console.log(ElectricCar.ym); // BMW


// 4 using the class starting  ES6 


class Car3 {
 
    constructor(maker, price) {
        this.maker = maker;
        this.price = price;
    }
 
    getInfo() {
        console.log(this.maker + " costs : " + this.price);
    }
}

var carobj1 = new Car3('BMW',2000);
carobj1.getInfo();