简评:ES6(ECMAScript2015)其实是一种新的 JavaScript
规范,包含了一些很棒的新特性,能够更加方便地实现不少复杂的操做。
先看一下 ES6 的新特性:es6
Hack #1: Swap variables 交换变量数组
使用 Array Destructuring 交换值异步
let a = 'world', b = 'hello' [a, b] = [b, a] console.log(a) // -> hello console.log(b) // -> world // Yes, it's magic
Hack #2 : Async/Await with Destructuring函数
下面这段代码能够同时发起两个异步请求,把请求结果分别附到 user 和 account 中fetch
const [user, account] = await Promise.all([ fetch('/user'), fetch('/account') ])
Hack #3 : Debuggingthis
const a = 5, b = 6, c = 7 console.log({ a, b, c }) // outputs this nice object: // { // a: 5, // b: 6, // c: 7 // }
Hack #4 : One linersspa
更紧凑的数组操做语法code
// Find max value const max = (arr) => Math.max(...arr); max([123, 321, 32]) // outputs: 321 // Sum array const sum = (arr) => arr.reduce((a, b) => (a + b), 0) sum([1, 2, 3, 4]) // output: 10
Hack #5 : Array concatenation对象
展开运算符能够用来代替 concatblog
const one = ['a', 'b', 'c'] const two = ['d', 'e', 'f'] const three = ['g', 'h', 'i'] // Old way #1 const result = one.concat(two, three) // Old way #2 const result = [].concat(one, two, three) // New const result = [...one, ...two, ...three]
Hack #6 : Cloning
const obj = { ...oldObj } const arr = [ ...oldArr ]
Hack #7 : Named parameters 参数命名
const getStuffNotBad = (id, force, verbose) => { ...do stuff } const getStuffAwesome = ({ id, name, force, verbose }) => { ...do stuff } // Somewhere else in the codebase... WTF is true, true? getStuffNotBad(150, true, true) // Somewhere else in the codebase... I ❤ JS!!! getStuffAwesome({ id: 150, force: true, verbose: true })
原文连接: 7 Hacks for ES6 Developers