composition over inheritance

main.js

const barker = (state) => ({
  bark: () => console.log('Woof, I am ' + state.name)
})
const driver = (state) => ({
  drive: () => state.position = state.position + state.speed
})


const murderRobotDog = (name)  => {
  let state = {
    name,
    speed: 100,
    position: 0
  }
  return Object.assign(
    {},
    barker(state),
    driver(state)
  )
}


const bruno =  murderRobotDog('bruno')
bruno.bark()