# partition

Partition the values of a RefArray using a predicate.

## Signatures

```ts
export declare const partition: {
    <A, B extends A>(predicate: (a: A) => a is B): <E, R>(ref: RefArray<A, E, R>) => RefSubject.Computed<R, E, readonly [
        ReadonlyArray<B>,
        ReadonlyArray<A>
    ]>;
    <A, E, R>(ref: RefArray<A, E, R>, predicate: (a: A) => boolean): RefSubject.Computed<never, E, readonly [
        ReadonlyArray<A>,
        ReadonlyArray<A>
    ]>;
};
```

## Why

Partition the values of a RefArray using a predicate. The operation remains attached to the
RefSubject's versioned state boundary.

## Ownership and lifetime

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