pointfree_开发者

Put two monadic values into a pair and return it

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[详细]

2023-04-08 17:33 分类：问答

Defining functions pointfree-style in functional programming. What are the cons/pros?

Every time I write something of the form let scorePopulation f population = Array.map (fun i -> f i) population[详细]

2023-04-04 09:22 分类：问答

Confusion about function composition in Haskell

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[详细]

2023-03-25 13:17 分类：问答

is point free code more efficient, or just terser?

I wrote the following code, which takes a bunch of points and draws them on the screen using the gloss library.[详细]

2023-03-16 03:10 分类：问答

Point-free pattern matching possible in Haskell?

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:[详细]

2023-03-03 04:56 分类：问答

Haskell function composition operator of type (c→d) → (a→b→c) → (a→b→d)

Ordinary function composition is 开发者_C百科of the type (.) :: (b -> c) -> (a -> b) -> a -> c[详细]

2023-03-01 03:22 分类：问答

What are advantages and disadvantages of "point free" style in functional programming?

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[详细]

2023-02-26 06:53 分类：问答

How to use (->) instances of Monad and confusion about (->)

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.[详细]

2023-02-17 01:53 分类：问答

Trick for "reusing" arguments in Haskell?

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.[详细]

2023-01-29 00:11 分类：问答

Fiddling with point-free code?

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[详细]

2023-01-14 12:51 分类：问答