Encapsulation with ES6 modules

hedgehog.js

export const Hedgehog = () => {
  const speed = 10000
  const name = 'Sonic'
  
  const hedgehog = {
    name,
    zoom: () => zoom( hedgehog.name, speed )
  }
  
  return hedgehog
}

const zoom = ( name, speed ) => 
  console.log(`${ name } zooms with the speed of ${ speed } miles per second!`)

index.js

import { Hedgehog } from './hedgehog'
 
const sonic = Hedgehog()
sonic.zoom()
 
console.log( sonic.name ) //valid value
console.log( sonic.speed ) // undefined