編寫 ES6 的 7 個實用技巧

無腦翻譯走一波~

使用陣列解構交換變數的值

let a = 'world', b = 'hello'

[a, b] = [b, a]
console.log(a) // -> hello
console.log(b) // -> world
// yes, it's magic

const [user, account] = await promise.all([

fetch('/user'),
fetch('/account')
])

const a = 5, b = 6, c = 7

console.log()
// outputs this nice object:
//

// 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

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]

const obj = 

const arr = [ ...oldarr ]

const getstuffnotbad = (id, force, verbose) => 

const getstuffawesome = () => 
// somewhere else in the codebase... wtf is true, true?
getstuffnotbad(150, true, true)
// somewhere else in the codebase... i ❤ js!!!
getstuffawesome()

ES6的7個實用技巧

利用陣列解構來實現值的互換 let a world b hello a,b b,a console.log a hello console.log b world我們經常使用console.log 來進行除錯，試試console.table 也無妨。const a 5,b 6,c 7 console...

ES6 變數的結構賦值用途（實用技巧）

1.交換變數的值 let x 1 let y 2 x,y y,x x 2,y 1 2.從函式返回多個值 函式只能返回乙個值，如果要返回多個值，只能將它們放在陣列或者物件裡返回，有了解構賦值，取出這些值就非常方便了。返回陣列 function example let a,b,c example a 1...

ES6的七個技巧

利用陣列解構來實現值的互換 let a world b hello a,b b,a console.log a hello console.log b world我們經常使用console.log 來進行除錯，試試console.table 也無妨。const a 5,b 6,c 7 console...