# east Function – revise
```tsx
const revise: <T>(a: T, b: Update<T>) => Update<T>
```
Revise update B with values from A.

Supported operators:
- `@{$apply}`
- `@{$delete}`
- `@{$merge}`
- `@{$nop}`
- `@{$patch}`
- `@{$set}`
## Source
packages / state / <a href="https://gitlab.com/unconed/use.gpu/-/blob/master/packages/state/src/patch.ts#L219">src / patch.ts</a>