ES6基础之——new Set

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Set 对象存储的值总是唯一的

Set 对象方法

Set 对象作用

• 数组去重

var arr = [1,2,3,3,1,4];
[...new Set(arr)]; // [1, 2, 3, 4]
Array.from(new Set(arr)); // [1, 2, 3, 4]
[...new Set(‘ababbc‘)].join(‘‘); // "abc" 字符串去重
new Set(‘ice doughnut‘); //["ice","doughnut"]

• 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}

ES6基础之——new Set

标签：com   pre   ram   指定   strong   对象存储   字符串去重   hnu   uil   

原文地址：https://www.cnblogs.com/houxianzhou/p/13530093.html