filter
fun filter(fn: (data: Any?, options: ArrayOptions?) -> PromiseResult<Boolean>, options: ArrayOptions = definedExternally): Readable(source)
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 awaited.
Since
v17.4.0, v16.14.0
Parameters
fn
a function to filter chunks from the stream. Async or not.