Factory Pattern examples using ES6 syntax

myPinkTruck.js

class Car {
  constructor(doors = 4, state = "brand new", color = "silver") {
    this.doors = doors
    this.state = state
    this.color = color
  }
}

class Truck {
  constructor(state = "used", wheelSize = "large", color = "blue") {
    this.state = state
    this.wheelSize = wheelSize
    this.color = color
  }
}

class VehicleFactory {
  vehicleClass = Car
  createVehicle = (type, props) => {
    switch(type) {
      case "car":
        return new this.vehicleClass(props.doors, props.state, props.color)
      case "truck":
        return new this.vehicleClass(props.state, props.wheelSize, props.color)
    }
  }
}

// Let's build a vehicle factory!

const factory = new VehicleFactory()
const car = factory.createVehicle( "car", {
  doors: 6,
  color: "green"
})

console.log(JSON.stringify(car))

const truck = factory.createVehicle( "truck", {
  state: "like new",
  color: "red",
  wheelSize: "small"
})

console.log(JSON.stringify(truck))

// Let's build a truck factory!

class TruckFactory extends VehicleFactory {
  vehicleClass = Truck
}

const truckFactory = new TruckFactory()
const bigTruck = truckFactory.createVehicle( "truck", {
  state: "omg ... so bad",
  color: "pink",
  wheelSize: "so BIG"
})

console.log(JSON.stringify(bigTruck))

Thanks for this example. It's simple and easy to understand. ;)