Are Monads a Waste of Time? | Lambda the Ultimate
I was thinking about this yesterday. If the point of functional code is that it is easier to reason about, should we like Monads? Consider we have an interpreter, and that we construct a sequence of commands in the free monad. Given a program like this: f = do s <- newRef writeRef s 23 writeRef s 42 readRef s Now I have deliberately not specified the implementation of the interpreter, it could be
Programming with distributed functional futures
Dataflow task parallelism with futures This post concentrates on dataflow task parallelism with Haskell and Erlang. The Haskell below uses the monad-par library to construct the dataflow task graph on the right, executed in parallel with runPar: import Control.Monad.Par f :: Par Int g,h :: Int -> Par Int j,k :: Int -> Int -> Par Int main = print $ runPar $ do a <- spawn f b <- spawn (get a >>= g)
Error vs. Exception - HaskellWiki
There has been confusion about the distinction between errors and exceptions for a long time, repeated threads in Haskell-Cafe and more and more packages that handle errors and exceptions or something between. Although both terms are related and sometimes hard to distinguish, it is important to do it carefully. This is like the confusion between parallelism and concurrency. The first problem is th
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Dorophone: Deep Emacs Lisp Part 1 (Basically, a Monad Tutorial)
[FAQ]Haskellには副作用があるのか、ないのか![[FAQ]Haskellには副作用があるのか、ないのか](https://cdn-ak-scissors.b.st-hatena.com/image/square/e8b5f753587db45b02829cec4e07adc72278f3df/height=288;version=1;width=512/https%3A%2F%2Fs.tgstc.com%2Fogp3%2Fc0d19d917305257561516bc192e7eb90-1200x630.jpeg)
http://www.kennknowles.com/blog/2007/12/20/infinite-lazy-knuth-bendix-completion-for-monoids-in-haskell/