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This article brings you a summary of several practical skills in ES6 Super. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
Hack #1 Exchange elements
Use array destructuring to achieve value exchange
let a = 'world', b = 'hello' [a, b] = [b, a] console.log(a) // -> hello console.log(b) // -> world
Hack #2 Debugging
We often use console.log() for debugging, it doesn’t hurt to try console.table().
const a = 5, b = 6, c = 7 console.log({ a, b, c }); console.table({a, b, c, m: {name: 'xixi', age: 27}});
Hack #3 Single statement
In the ES6 era, statements that operate on arrays will be more compact
// 寻找数组中的最大值 const max = (arr) => Math.max(...arr); max([123, 321, 32]) // outputs: 321 // 计算数组的总和 const sum = (arr) => arr.reduce((a, b) => (a + b), 0) sum([1, 2, 3, 4]) // output: 10
Hack #4 Array Splicing
The expansion operator can replace concat
const one = ['a', 'b', 'c'] const two = ['d', 'e', 'f'] const three = ['g', 'h', 'i'] const result = [...one, ...two, ...three]
Hack #5 Making a copy
We can easily implement arrays and shallow copies of objects
const obj = { ...oldObj } const arr = [ ...oldArr ]
Hack #6 Named parameters
Destructuring makes function declarations and function calls more readable
// 我们尝尝使用的写法 const getStuffNotBad = (id, force, verbose) => { ...do stuff } // 当我们调用函数时, 明天再看,尼玛 150是啥,true是啥 getStuffNotBad(150, true, true) // 看完本文你啥都可以忘记, 希望够记住下面的就可以了 const getStuffAwesome = ({id, name, force, verbose}) => { ...do stuff } // 完美 getStuffAwesome({ id: 150, force: true, verbose: true })
Hack #7 Async/Await combined with array destructuring
Array destructuring is great! Combining Promise.all with destructuring and await will make the code more concise
const [user, account] = await Promise.all([ fetch('/user'), fetch('/account') ])
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