Shift Array by First and Last Item

There is an array.

If the most right first item is replaced by another different value, the array has to shift to the right without changing the fixed array count. If the most left last item is replaced by another different value, the array has to shift to the left without changing the fixed array count.

x = [1,2,3,4,5];
function leftSwipe(newItem){
  x.pop();
  x = [newItem, ...x];
}
function rightSwipe(newItem){
  x.shift();
  x = [...x, newItem]
}
leftSwipe(3);
console.log(x);
rightSwipe(10);
console.log(x);