ES6 - Array.from() method converts array-like or iterator (Map, Set) to true array

1. Convert class array to array

let likeArr = {
    
    
    '0': 'aaa',
    '1': 'aaa',
    '2': 'aaa',
    length: 3
} 
// ES5 将类数组 转为数组
let arr1 = [].slice.call(likeArr)
// ES6 将类数组 转为数组
let arr2 = Array.from(likeArr)

2. Convert Set to Array

let set = new Set([1,2,3,4,5])
let arr3 = Array.from(set)
let arr4 = [...set] // 扩展运算符也可实现 转数组操作

3. Convert Map to Array

let map = new Map([[1,2],[true, 1], [false, 0], ['aaa', 'a']])
let arr5 = Array.from(map)
let arr6 = [...map] // 扩展运算符也可实现 转数组操作

4. Convert the arguments of the function to an array

function x(a,s,d,f) {
    
    
  let arr7 = [...arguments] // 扩展运算符也可实现 转数组操作
  let arr8 = Array.from(arguments)
  console.log(arguments);
  console.log(arr7);
  console.log(arr8);
}
x(1,2,3,4)

Just record this, I wish you all a happy!