I am playing with Parsec and I want to combine two parsers into one with the result put in a pair, and then feed i开发者_C百科t another function to operate on the parse result to write something like
Every time I write something of the form let scorePopulation f population = Array.map (fun i -> f i) population
Consider following function definition in ghci. let myF = sin . cos . sum where, .开发者_JS百科 stands for composition of two function (right associative). This I can call
I wrote the following code, which takes a bunch of points and draws them on the screen using the gloss library.
Given: data TwoInts = TwoInts Int Int add\'em :: TwoInts -> Int add\'em (TwoInts a b) = a+b is it possible to write add\'em without having to name a and b.Something like:
Ordinary function composition is 开发者_C百科of the type (.) :: (b -> c) -> (a -> b) -> a -> c
I know that in some languages (Haskell?) the striving is to achieve point-free style, or to never explicitly r开发者_如何转开发efer to function arguments by name.This is a very difficult concept for m
At different questions I\'ve found hints in comments concerning using the (->) instance of Monads e.g. 开发者_StackOverflowfor realizing point-free style.
From time to time I stumble over the problem that I want to express \"please use the last argument twice\", e.g. in order to write pointfree style or to avoid a lambda. E.g.
I have been learning the Factor and J lan开发者_Go百科guages to experiment with point-free programming. The basic mechanics of the languages seem clear, but getting a feeling for how to approach algor
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