chuck
/
es6-11study


			
				
					
						
						
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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let s = new Set()
        let s2 = new Set([1,2,3,4])
        console.log(s2) //{1,2,3,4}

        //元素个数
        console.log(s2.size)
        //添加
        s2.add(5)
        console.log(s2)
        //删除
        s2.delete(1)
        //检测
        console.log(s2.has(5))
        //清空
        //s2.clear();
        //可以使用for of
        for(let v of s2){
            console.log(v)
        }

        //集合实践
        //数组去重
        let arr = [1,2,4,3,2,4,5,3]
        // let result = [...new Set(arr)]
        // console.log(result)

        //交集
        let arr2 = [4,3,5,7,8]
        let result = [...new Set(arr)].filter(item=>{
            return arr2.includes(item)
        })
        console.log(result)

        //并集
        let union = new Set([...arr,...arr2])
        console.log(union)

        //差集
        let diff = [...new Set(arr)].filter(item=>!(new Set(arr2).has(item)))
        console.log(diff)
    </script>
</body>
</html>