Function filter

filter<V>(predicate: (item: NoInfer<V>) => Awaitable<boolean>): Task<V>
Creates a task retaining only the items matching a predicate.

Items are emitted in source order.
Note
- Incremental: items are emitted as they are drawn, so the reported feed runs dry as the feed drawn from does.
- Streaming: items are tested one at a time, none retained.
- Stateless: every item is tested on its own, so the outcome is unaffected by how the feed is split across nested feeds or runs.
Type Parameters
- V
  The type of items in the feed
Parameters
- predicate: (item: NoInfer<V>) => Awaitable<boolean>
  The function testing each item
Returns Task<V>
A task yielding the items matching predicate
Example
```
await pipe(
  (items([1, 2, 3, 4, 5]))
  (filter(n => n%2 === 0))
  (toArray())
);  // [2, 4]
```
- Defined in tasks/filter.ts:51