takeWhile package:streaming

End stream when an element fails a condition; the original return value is lost. By contrast span preserves this information, and is generally more desirable.

S.takeWhile thus = void . S.span thus

To preserve the information - but thus also force the rest of the stream to be developed - write

S.drained . S.span thus

as dropWhile thus is

S.effects . S.span thus

Like takeWhile, but takes a monadic predicate.