There are four ways an object can be created in JavaScript
- object as a literal
- Using the new operator, also knows as constructor invocation pattern
- Using the Object.create() method
- Using the class starting ES6
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| // 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(); | |
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Dhananjay Kumar 