.js

function Vehicle() {
  this.numTires = 4
}

Vehicle.prototype.start = () => {
  console.log('engine starting!')
}

// const v = new Vehicle()
// v.start()

function Car() {
  Vehicle.call(this)
}

Car.prototype = Object.create(Vehicle.prototype)

Car.prototype.rollDownWindows = () => {
  console.log('rolling down windows')
  console.log(this)
}

const c = new Car()
console.log(c.numTires)

c.start()
c.rollDownWindows()