[Functional Programming] liftA2 and converge
发布时间:2020-12-13 23:31:35 所属栏目:Linux 来源:网络整理
导读:Sometimes I am confused with ‘liftA2‘ and ‘converge‘ functions.? ? Main difference between those is that: liftA2 takes applicative functor as second and third arguements,for example,array converge takes functions as second and third ar
Sometimes I am confused with ‘liftA2‘ and ‘converge‘ functions.? ? Main difference between those is that: liftA2 takes applicative functor as second and third arguements,for example,array converge takes functions as second and third arguements // liftA2 :: Applicative m => (a -> b -> c) -> m a -> m b -> m c // converge :: (b -> c -> d) -> (a -> b) -> (a -> c) -> a -> d ? // liftA2 :: Applicative m => (a -> b -> c) -> m a -> m b -> m c // converge :: (b -> c -> d) -> (a -> b) -> (a -> c) -> a -> d const { option,curry,liftA2,converge } = require("crocks"); const { getState } = require("../../helper"); // getColors :: () -> State AppState [String] const getColors = () => getState("colors").map(option([])); // getShapes :: () -> State AppState [String] const getShapes = () => getState("shapes").map(option([])); // buildCard :: String -> String -> Card const buildCard = curry((color,shape) => ({ id: `${color}-${shape}`,color,shape })); // buildCards :: [String] -> [String] -> [Card] const buildCards = liftA2(buildCard); // generateCards :: () -> State AppState [ Card ] const generateCards = converge(liftA2(buildCards),getColors,getShapes); module.exports = { generateCards }; (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |