Reference

Stack

New

Input	A list of elements.
Output	A stack containing the list of elements with the last element at the top of the stack.

Push

Input	A stack and an element.
Output	A new stack with the element added to the top.

Pop

Input	A stack.
Output	A new stack with the top element removed.

Peek

Input	A stack.
Output	The element at the top of the stack.

Is Empty

Input	A stack.
Output	True if the stack is empty, false otherwise.

Is Not Empty

Input	A stack.
Output	True if the stack is not empty, false otherwise.

Length

Input	A stack.
Output	The number of elements in the stack.

Reverse

Input	A stack.
Output	A new stack with the elements in reverse order.