Summary

Pattern Comparison

Pattern	When to Apply	Strengths	Caveats	Common Use Cases
Command	When you need to record and manage actions	Supports Undo/Redo, allows re-execution of actions	Responsibility for state is on the command	Text editors, batch operations
Memento	When full state snapshots are needed	Easy state restoration, encapsulated and safe	Snapshot size can become heavy	Form restoration, game saves

Choosing the Right Pattern

• Use Command when you need to record actions and enable replay or reversal.
• Use Memento when you need to capture and restore entire states.
• Both can be combined to manage “action history + state snapshots” effectively.

Team Discussion Snippets

• “We need to restore this operation—let’s introduce a Command history.”
• “If we’re saving the entire state, Memento might be simpler and safer.”
• “Use Command for action history and rollback; use Memento to capture full state at key points.”