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# Pointer

Use ValuePointer to perform mutable updates on existing values using [RFC6901](https://www.rfc-editor.org/rfc/rfc6901) Json Pointers.

```typescript
import { ValuePointer } from "@alkdev/typebox/value";

const A = { x: 0, y: 0, z: 0 };

ValuePointer.Set(A, "/x", 1); // A' = { x: 1, y: 0, z: 0 }
ValuePointer.Set(A, "/y", 1); // A' = { x: 1, y: 1, z: 0 }
ValuePointer.Set(A, "/z", 1); // A' = { x: 1, y: 1, z: 1 }
```

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