Remove Items from an Array with pop() and shift()

Summary

pop() removes an element from the end of an array.
shift() removes an element from the beginning of an array.

Final Code

function popShift(arr) {
  let popped = arr.pop(); // Change this line
  let shifted = arr.shift(); // Change this line
  return [shifted, popped];
}

console.log(popShift(['challenge', 'is', 'not', 'complete']));