[Home](../../readme.md) | [Installation](../installation.md) | [Usage](../usage.md) | [Types](../types/) | **Values** | [Syntax](../syntax/) | [TypeRegistry](../type-registry.md) | [TypeCheck](../type-check.md)

# Mutate

Use the Mutate function to perform a deep mutable value assignment while retaining internal references.

```typescript
const Y = { z: 1 }; // const Y = { z: 1 }
const X = { y: Y }; // const X = { y: { z: 1 } }
const A = { x: X }; // const A = { x: { y: { z: 1 } } }

Value.Mutate(A, { x: { y: { z: 2 } } }); // A' = { x: { y: { z: 2 } } }

const R0 = A.x.y.z === 2; // const R0 = true
const R1 = A.x.y === Y; // const R1 = true
const R2 = A.x === X; // const R2 = true
```

Back to [Home](../../readme.md)