# get

Projects one statically valid tuple index as Computed state.

## Signatures

```ts
export declare const get: {
    <T extends ReadonlyArray<unknown>, I extends Indices<T> & keyof T>(index: I): <E, R>(ref: RefTuple<T, E, R>) => RefSubject.Computed<T[I], E, R>;
    <T extends ReadonlyArray<unknown>, I extends Indices<T> & keyof T, E, R>(ref: RefTuple<T, E, R>, index: I): RefSubject.Computed<T[I], E, R>;
};
```

## Why

The index is constrained to the tuple's known indices, so every current value has that element.
The result is Computed, cannot become absent, and does not add `NoSuchElementError`.

## Ownership and lifetime

The get view retains no independent state. An Effect read samples the source once; Fx
observation follows later pushes and its observing Scope owns subscription cleanup.