Arrows

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Comparing list length with arrows

Inspired by Comparing list length If I want to find the longest list in a list of lists, the simplest way is probably:[详细]

2023-04-12 13:03 分类：问答
how to mix applicative functors and arrows

i read on Andrew Birkett’s blog Applicative arrows for XML &&& return to pure that we could mix arrows and applicative functors.[详细]

2023-04-08 03:42 分类：问答
How to pass parameters to HXT arrows and how to use -<<

my question is the following. I have this xml file to parse : <DATAS LANG=\"en\"> <SCENARIO ID=\"19864\">[详细]

2023-04-07 09:54 分类：问答
Calling an IO Monad inside an Arrow

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[详细]

2023-04-01 01:47 分类：问答
Is (map f) == concatMap (map f . (:[]))?

I defined the left/right methods for stream functions (SF) of the ArrowChoice class as follows: newtype SF a b = SF { runSF :: [a] -> [b] }[详细]

2023-03-24 00:09 分类：问答
How can I define a filter function for arrows?

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.[详细]

2023-03-21 10:08 分类：问答
Getting Data from a Simple XML

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.[详细]

2023-03-16 21:55 分类：问答
How does the Haskell rec keyword work?

In arrow do notation, you can use the rec keyword to write recursive definitions. So for example: rec name <- function -< input[详细]

2023-02-19 09:23 分类：问答
How does a pair unify with the types of the Arrow functions

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[详细]

2023-02-06 19:46 分类：问答
What are arrows, and how can I use them?

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[详细]

2023-01-25 01:50 分类：问答