immutable-pop-method.md

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

// remove the last element using slice method, creating a new reference
// in this example we don't need to use spread operator
const newDarkSide = darkSide.slice(0, darkSide.length - 1)

// the original variable wasn't updated
console.log(darkSide)
// ['Darth Vader', 'Darth Sidious', 'Supreme Leader Snoke']

// only the new one was updated
console.log(newDarkSide)
// ['Darth Vader', 'Darth Sidious']