Inspired by Comparing list length If I want to find the longest list in a list of lists, the simplest way is probably:
i read on Andrew Birkett’s blog Applicative arrows for XML &&& return to pure that we could mix arrows and applicative functors.
my question is the following. I have this xml file to parse : <DATAS LANG=\"en\"> <SCENARIO ID=\"19864\">
Perhaps I\'m going about this the wrong way, but I\'m using HXT to read in some vertex data that I\'d like to use in an array in HOp开发者_如何学编程enGL. Vertex arrays need to be a Ptr which is creat
I defined the left/right methods for stream functions (SF) of the ArrowChoice class as follows: newtype SF a b = SF { runSF :: [a] -> [b] }
I\'m currently reading through the paper Programming with Arrows by John Hughes and I\'m already stumped开发者_如何学Go on the first exercise, in section 2.5, on pg 20.
I am trying to extract some data from an XML input with 6 lines, using HXT. I want to keep HXT, too, because of the Curl integration and because I have other XML files with thousands of lines, later.
In arrow do notation, you can use the rec keyword to write recursive definitions. So for example: rec name <- function -< input
Some of the functions for working with Arrows ar开发者_如何学运维e quite handy to use on pairs.But I can\'t understand how the types of these functions unify with a pair.In general, I find the types o
I tried to learn the meaning of arrows, but I didn\'t understand them. I used the Wikibooks tutorial. I think Wikibook\'s problem is mainly that it seems to be written for somebody who already under
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