const curry = R.curry((fns, ary) => R.ap(fns, ary)); ), R.add()]); ,,]); console.log(res); //[2, 4, 6, 4, 5, 6] const compose = R.compose( R.reverse, R.ap([R.multiply(), R.add()]) ); ,,]); console.log(res1); //[6, 5, 4, 6, 4, 2] , x)) const pipe = R.…

函数式编程中有一种模式是通过组合多个函数的功能来实现一个组合函数.一般支持函数式编程的工具库都实现了这种模式,这种模式一般被称作compose与pipe.以函数式著称的Ramda工具库为例. const R = require('ramda'); function inc (num) { return ++num; } const fun1 = R.compose(Math.abs, inc, Math.pow) const fun2 = R.pipe(Math.pow, Math.abs, i…

Most of the functions offered by the ramda library are curried by default. Functions you've created or that you've pulled in from another library may not be curried. Ramda's curry and curryN functions allow you to take a non-curried function and use…

In this lesson we'll take some existing code and refactor it using some functions from the Ramda library, most notably, compose and converge. When we're done, we'll have taken a function with a couple of local variables and parameter references and c…

Let's we want to combine two account accidently have the same name. , friends: ['Franklin'] } , friends: ['Gatsby'] } So, here we can use Semi-group to combine them, because the semi-group have the knowledge how to combine for each type of object. So…

State is a lazy datatype and as such we can combine many simple transitions into one very complex one. This gives us a lot of control over how our state changes over time. In this lesson we will use this to our advantage and combine many transactions…

compose即函数嵌套组合 组合compose在第一篇已经初见端倪,可以感受一下.compose函数的实现用闭包的方法.不完善实现如下: const compose = (f, g) => { return x => f(g(x)); }; compose使用实例 你可以用ramda的compose函数,而不是自己实现. import {compose} from 'ramda' const f = (x: number) => 2 * x const g = (y: number)…

每个JavaScript开发人员应该知道的33个概念 介绍 创建此存储库的目的是帮助开发人员在JavaScript中掌握他们的概念.这不是一项要求,而是未来研究的指南.它基于Stephen Curtis撰写的文章,你可以在这里阅读. 社区 随意提交PR添加链接到您自己的概述或评论.如果您想将repo翻译成您的母语,请随意这样做. 该回购的所有翻译将在下面列出: 中文 - Re Tian 葡萄牙语 - BR - Tiago Boeing 韩语 - Suin Lee 西班牙语 - Adonis Me…

Well, this stuff will be a little bit strange if you deal with it first time. Container Object: Just a wrapper / contianer for values No Method No Nouns var _Container = function(val){ this.val = val; } var Container = function(x){ return new _Contai…

Let's say we want to write a most simple implementation 'avg' function: const avg = list => { let sum = 0; for(let i = 0; i < list.length; i++) { sum += list[i] } return sum / list.length } Basiclly, the 'avg' function doing two things: Calculate su…