LLD - Behavioral Design Patterns — Part 2
In a system using Memento pattern, how can you combine it with the Command pattern to implement undo/redo functionality effectively?
In a system using Memento pattern, how can you combine it with the Command pattern to implement undo/redo functionality effectively?
hard📝 Trade-off Q9 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand roles of Command and Memento
Command encapsulates actions; Memento saves object states before changes.Step 2: Combine for undo/redo
Before executing a Command, save current state in a Memento. Undo uses Memento to restore state.Final Answer:
Use Command objects to execute actions and Mementos to save states before execution -> Option DQuick Check:
Command = actions, Memento = state snapshots [OK]
Quick Trick: Commands do actions; Mementos save states [OK]
Common Mistakes:
MISTAKES- Confusing Memento with Command
- Trying to execute commands via Mementos
- Ignoring state saving before commands
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