<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Set实现数组去重、交集、并集、差集</title>
</head>
<body>
</body>
<script>
let {log} = console;
let arr = [1,2,3,3];
let arr1 = [1,2,3,3,5];
// 去重
let set1 = new Set([...arr]);
log([...set1]);// [1,2,3]
// 并集
let set2 = new Set([...arr, ...arr1]);
log([...set2]);// [1,2,3,5]
// 交集
let set3 = new Set([...set2].filter(x=>set1.has(x)));
log([...set3]);// [1,2,3]
// 差集
let set4 = new Set([...set2].filter(function (x) {
return !set1.has(x)
}))
log([...set4]); // [5]
let setarr1 = new Set([1,2]);
setarr1.add(0);
log(setarr1);
setarr1.delete(2);
log(setarr1);
</script>
</html>