On Fri, Feb 1, 2013 at 8:42 AM, Simon Marechal
On 02/01/2013 05:21 AM, Michael Snoyman wrote:
Firstly, what's the use case that you want to deal with lists? If it's for efficiency, you'd probably be better off using a Vector instead.
That is a good point, and I wanted to go that way, but was not sure it would help me a lot here. My use case is for services where there is a "bulk" API, such as Redis pipelining or Elasticsearch bulk inserts. The network round-trip gains would exceed by far those from a List to Vector conversion.
But I think the inverse of `concat` is `singleton = Data.Conduit.List.map return`, or `awaitForever $ yield . return`, using the list instance for Monad. Your conduitMap could be implemented then as:
conduitMap conduit = concat =$= conduit =$= singleton
I can see how to do singleton, but that would gain me ... singletons. That means I could not exploit a bulk API.
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So you're saying you want to keep the same grouping that you had originally? Or do you want to batch up a certain number of results? There are lots of ways of approaching this problem, and the types don't imply nearly enough to determine what you're hoping to achieve here. Michael