Removes the first element from a stack. If there were previously n elements in the stack (numbered 0 to n-1) there will now be n-1 elements in the stack (numbered 0 to n-2) with thisStack now containing the old value of thisStack, thisStack now containing the old value of thisStack and so on. Calling this function is equivalent to calling the dequeue command.
The command returns the value which was removed; the old value of thisStack.
The Multi-Purpose Stack / Array / Queue Type
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