mutable-pop-method.md

const darkSide = ['Darth Vader', 'Darth Sidious', 'Supreme Leader Snoke']

// define newDarkSide with darkSide reference
const newDarkSide = darkSide

// remove the last element of the new array created
newDarkSide.pop()

// the original variable is updated too, because it is the original reference
console.log(darkSide)
// ['Darth Vader', 'Darth Sidious']

// variable newDarkSide was updated by the reference
console.log(newDarkSide)
// ['Darth Vader', 'Darth Sidious']