When working with arrays in Javascript, there's two sets of functions if you want to add or remove items to an array to a certain end of the array. shift / unshift: remove / add items at the front of the array. pop / push: remove / add items at the end of an array. I had a scenario where using shift acted differently than I expected and lead to some interesting results. How Array.shift works By definition on MDN: The shift method removes the element at the zeroeth index and shifts the values at ...