类型转换
Array
// Array 转 Set
var mySet = new Set(["value1", "value2", "value3"]); // 用...操作符,将 Set 转 Array
var myArray = [...mySet]; String // String 转 Set
var mySet = new Set(‘hello‘); // Set {‘h‘, ‘e‘, ‘l‘, ‘l‘, ‘o‘} // 注:Set 中 toString 方法是不能将 Set 转换成 String
Set 对象作用
数组去重
var mySet = new Set([1, 2, 3, 4, 4]); [...mySet]; // [1, 2, 3, 4]
并集
var a = new Set([1, 2, 3]); var b = new Set([4, 3, 2]); var union = new Set([...a, ...b]); // {1, 2, 3, 4}
交集
var a = new Set([1, 2, 3]); var b = new Set([4, 3, 2]); var intersect = new Set([...a].filter(x => b.has(x))); // {2, 3}
差集
var a = new Set([1, 2, 3]); var b = new Set([4, 3, 2]); var difference = new Set([...a].filter(x => !b.has(x))); // {1}
原文地址:https://www.cnblogs.com/lyj153/p/10559460.html
时间: 2024-07-31 00:17:44