gistfile1.txt

<script>
  function vehicleFactory (speed) {
    // 1. Declare a new object
    const vehicle = {}
    // 2. Customize the object
    vehicle.distance = 0
    vehicle.speed = speed
    vehicle.travel = function () {
      vehicle.distance += vehicle.speed
    }
    // 3. Return the object
    return vehicle
  }
  const racecar = vehicleFactory(200)
  const minivan = vehicleFactory(55)
  console.log('initial racecar', racecar)
  console.log('initial minivan', minivan)

  racecar.travel()
  minivan.travel()
  console.log('final racecar', racecar)
  console.log('final minivan', minivan)

  class Vehicle {
    constructor (speed) {
      this.distance = 0
      this.speed = speed
    }

    travel () {
      this.distance += this.speed
    }
  }
  const fighter = new Vehicle(2000)
  const pogo = new Vehicle(10)
  console.log('fighter', fighter)
  console.log('pogo', pogo)
  fighter.travel()
  // pogo.travel()
  console.log('final fighter', fighter)
  console.log('final pogo', pogo)
</script>