es6set常见实用用法解析

并集
//let setofwords1 = new set([1, 2, 3]);
//let setofwords2 = new set([3, 5, 2]);

var array1 = [5,6,7,8,18,9,90,81]; 
var array2 = [10,415,54,87,98,65,81];
let a = new set(array1);
let b = new set(array2); 
// 并集
let unionset = new set([...a, ...b]);
// set转化为数组
let unionset1 = array.from(unionset);
console.log(unionset1);
// 交集
let intersectionset = new set([...a].filter(x => b.has(x)));
// set转化为数组
let intersectionset1 = array.from(intersectionset);
console.log(intersectionset1);
// 差集
let differenceabset = new set(
.filter(x => !b.has(x)));
// set转化为数组
let differenceabset1 = array.from(differenceabset);
console.log(differenceabset1);

set 转为数组的另外一种方式
[...a] a 是一个set 对象