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## Why do I need it?
There's a lot more to calculating diffs than performing table view animations easily!
Wherever you have code that propagates `added`/`removed`/`moved` callbacks from your model to your user interface, you should consider using a library that can calculate differences. Animating small batches of changes is usually going to be faster and provide a more responsive experience than reloading all of your data.
Calculating and acting on differences should also aid you in making a clear separation between data and user interface, and hopefully provide a more declarative approach: your model performs state transition, then your UI code performs appropriate actions based on the calculated differences to that state.
## How to use
### Placeholder Images