Re: [Haskell-cafe] Data.Enumerator.List.concatMap is to Data.Iteratee.?

From: David Place

Hi:

I've been studying iteratee IO. Is there a function in the iteratee package that is analogous to Data.Enumerator.List.concatMap?

Iteratee's 'Data.Iteratee.Iteratee.convStream', or the more general 'Data.Iteratee.Iteratee.unfoldConvStream', would be the rough equivalents. The difference is that DEL.concatMap operates on each chunk, whereas DII.convStream operates on the stream. This makes it possible to specify operations which work on multiple chunks. If you want a function more like DEL.concatMap, it would be

concatMap f = convStream (fmap f getChunk)

Note that stream type 's' in enumerator should generally be translated to '[s]' in iteratee. John