# reduceRight

Reduce the values of a RefArray to a single value in reverse order.

## Signatures

```ts
export declare const reduceRight: {
    <A, B>(b: B, f: (b: B, a: A, index: number) => B): <E, R>(ref: RefArray<A, E, R>) => RefSubject.Computed<B, E, R>;
    <A, E, R, B>(ref: RefArray<A, E, R>, b: B, f: (b: B, a: A, index: number) => B): RefSubject.Computed<B, E, R>;
};
```

## Why

Makes reduce right a live projection of the array; consumers can sample it now or observe it
without copying the source state.

## Ownership and lifetime

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