pop
Removes the last item from this deque and returns it.
Example
val deque = dequeOf(1, 2)
assert(deque.popLast() == 2)
assert(deque.popLast() == 1)
deque.popLast() // Exception!Content copied to clipboard
Return
The value that was previously the last item in this deque.
Throws
If this deque is empty.