immutable-shift-method.md

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

// remove the first element using slice method, creating a new reference
// in this example we don't need to use spread operator
const newLightSide = lightSide.slice(1)

// the original variable wasn't updated
console.log(lightSide)
// ['Yoda', 'Luke Skywalker', 'Obi-Wan Kenobi']

// only the new one was updated
console.log(newLightSide)
// ['Luke Skywalker', 'Obi-Wan Kenobi']