How would you implement an Undo/Redo feature conceptually (no code needed)?

Question

Accepted Answer

Undo/Redo feature can be created by maintaining a stack of previous actions and their reverse actions.

Maintain a stack of previous actions and their reverse actions
Push the action onto the stack when it is performed
When undo is requested, pop the last action from the stack and perform its reverse action
When redo is requested, pop the last reverse action from the stack and perform the original action
Ensure that the stack is cleared when a new action is performed after undoing some actions