# pick

Pick elements at specific indices from the current state of a RefTuple.

## Signatures

```ts
export declare const pick: {
    <T extends ReadonlyArray<unknown>, const I extends ReadonlyArray<Indices<T>>>(indices: I): <E, R>(ref: RefTuple<T, E, R>) => RefSubject.Computed<Array<T[number]>, E, R>;
    <T extends ReadonlyArray<unknown>, const I extends ReadonlyArray<Indices<T>>, E, R>(ref: RefTuple<T, E, R>, indices: I): RefSubject.Computed<Array<T[number]>, E, R>;
};
```

## Why

Projects tuple state with pick for both current reads and future pushes, avoiding a second
mutable cache of the derived value.

## Ownership and lifetime

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