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Design Pattern

Memento

Capture and restore object state without exposing internals.

behavioral

Visual Diagram

state now
-> save snapshot
-> changes
-> restore snapshot

When To Use

  • ->Editor undo history
  • ->Draft snapshots
  • ->Session restore
  • ->Rollback state in workflows
Used in: Undo history, drafts, editor snapshots
memento.js

Live Editor

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Output

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