function indexFromEnd(array, placesFromEnd) {
  return array[array.length - (placesFromEnd + 1)];
}
Returns the element in an array at a particular index from the end
@param {Array.<T>} array Array to iterate over to find the item
@param {number} placesFromEnd Number of places from the end of the array to find
       the item to return
@returns {T} The item found in the array at the particular index
@template T