7 Sep
2014
7 Sep
'14
5:33 a.m.
For what it's worth, Conal Elliott did a series of blog posts on a similar subject[0]. One use case of the library he wrote for this is to write zip as lazily as possible[1], i.e. in such a way that, even if xs=undefined, zip [] xs = zip xs [] = undefined. Hopefully, this example can help you. Gesh [0] - http://conal.net/blog/posts/merging-partial-values [1] - http://www.haskell.org/pipermail/haskell-cafe/2009-January/053966.html