non-primitive-type.md

const droid = {
  name: 'R2-D2',
  quality: 'resourceful'
}

// define newDroid with droid reference
const newDroid = droid

// update some attribute
newDroid.quality = 'smart'

// variable droid was affected by that change because it is a reference
console.log(droid)
// [object Object] {
//   name: 'R2-D2',
//   quality: 'smart'
// }

// variable newDroid was updated by the reference
console.log(newDroid)
// [object Object] {
//   name: 'R2-D2',
//   quality: 'smart'
// }