function compose (f, g) { return function(x) { return f(g(x)); } } var arr = [1, 2, 3], reverse = function(x){ return x.reverse()}, getFirst = function(x) {return x[0]}, compseFunc = compose(getFirst, reverse);
function getCss(element, attr) { if ('getComputedStyle' in window) { return window.getComputedStyle(element)[attr]; } return element.currentStyle[attr]; } 但是每次进这个方法都要做一下判断,为了提高性能,我们可以存一个变量,然后每次进去判断变量就好了 var flag = 'getComputedStyle' in window fun...
In this lesson you will create a utility function that allows you to quickly compose behavior of multiple functions to create new behavior. By the end, you will have successfully created a tremendously popular helper function that is used in JavaScript libraries ranging fromReduxtoRamda. const star...
MaterialTheme主题中也有Shape形状属性,在许多的官方 Composable 组件中都有这个Shape属性,比如Button组件的Shape属性默认值就是MaterialTheme.shapes.small。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 // code 8funButton(···shape:Shape=MaterialTheme.shapes.small,···){} Shapes.kt提供了small、med...
but there are probably cases where you need to apply the same series of transformations against differentMaybes. In this lesson, we’ll look at some point-free versions of some common Maybe methods and see how we can compose them together to get a reusable function that can be applied to ...
代码语言:javascript 代码运行次数:0 运行 AI代码解释 constsendRequestReducer=()=>{return()=>{returnaxios.post(...)}} ok, 现在是一个纯函数了,正如Redux-saga中的effects一样: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 import{call}from'redux-saga/effects'function*fetchProducts(){constprodu...
functionsum(x){returnfunction(y){returnx+y;}}sum(1)(2)// 3; 所谓柯里化,就是把一个多参数的函数转化为单一参数函数, curry 主要有 3 个作用:缓存函数、暂缓函数执行、分解执行任务。 之前遇见过一个题目: 实现:sum(1).valueOf()=>1;sum(1,2).valueOf()=>3;sum(1,2)(3).valueOf()=>6...
Function composition allows us to build up powerful functions from smaller, more focused functions. In this lesson we'll demystify how function composition works by building our owncomposeandcomposeAllfunctions. //__test__import {add, inc, dbl, addInc, addIncDbl} from'../function/custom-compose...
类似Javascript的map,在JS中,使用map(传入一个函数作为参数,这里传入了一个匿名函数(arrow function))可以返回一个数组(forEach仅仅遍历返回)。 let a = [1, 2, 3, 4, 5]; re = a.map((e) => Math.pow(e, 2)); console.log(re);
The library enables you to dynamically set properties for your window in your javascript code. function windowOpenExample() { const window = new BrowserWindow( { url: "https://github.com/morganstanley/composeui", title: "My Web App", width: 1600, height: 800 }); window.open(); } windo...