Operations on Deques

push   deque new-value  => deque	[Generic Function]

push augments deque by adding new-value to the front of the deque.

pop   deque  => first-element	[Generic Function]

pop removes the first element from deque and returns it.

push-last   deque new-value  => deque	[Generic Function]

push-last augments deque by adding new-value to the end of the deque.

pop-last   deque  => last-element	[Generic Function]

pop-last removes the last element from deque and returns it.

add!   deque new-value  => deque	[G.F. Method]

This method is the same as push. That is, the result is == to deque, and deque is destructively modified by this operation.

remove!   deque value #key test count   => deque	[G.F. Method]

The result of remove! on a deque is == to the deque argument. deque is destructively modified by this operation.