mutable-shift-method.md

const lightSide = ['Yoda', 'Luke Skywalker', 'Obi-Wan Kenobi']

// define newLightSide with lightSide reference
const newLightSide = lightSide

// remove the first element of the new array created
newLightSide.shift()

// the original variable is updated too, because it is the original reference
console.log(lightSide)
// ['Luke Skywalker', 'Obi-Wan Kenobi']

// variable newLightSide was updated by the reference
console.log(newLightSide)
// ['Luke Skywalker', 'Obi-Wan Kenobi']