1-交换变量
通过数组解构完成
let a = 'world', b = 'hello'
[a, b] = [b, a]
console.log(a) ---> hello
console.log(b) ---> world
2- 通过Async-Await解构
通过数组解构与 Async-Await promise配合使用,可以轻松把玩复杂数据流。
const [user, account] = await Promise.all([
fetch('/user'),
fetch('/account')
])
3-Debugging
喜欢用console.log调试的客官们，现在推荐一个更娇羞的小情人console.table
const a = 5, b = 6, c = 7
console.log({ a, b, c })
// outputs this nice object:
{
a: 5,
b: 6,
c: 7
}
4-一口到底
对喜欢一口到底，爱装BB的，请看下面—不是给你下面吃…
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
5-数组连接
使用扩展运算符替代concat
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]
6-克隆新技术
可惜的只是浅克隆
const obj = { ...oldObj }
const arr = [ ...oldArr ]
7-命名参数
为了函数的可读性使用命名参数
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 })
