method ReadableBase.prototype.filter
Usage in Deno
import { ReadableBase } from "node:stream";
ReadableBase.prototype.filter(fn: (data: any,options?: Pick<ArrayOptions, "signal">,) => boolean | Promise<boolean>,options?: ArrayOptions,): Readable
This method allows filtering the stream. For each chunk in the stream the fn function will be called
and if it returns a truthy value, the chunk will be passed to the result stream.
If the fn function returns a promise - that promise will be await
ed.
fn: (data: any,options?: Pick<ArrayOptions, "signal">,) => boolean | Promise<boolean>
a function to filter chunks from the stream. Async or not.
optional
options: ArrayOptions
Readable
a stream filtered with the predicate fn.