JS 数组去重、字符串去重

let arr = [1,2,3,4,4,3,3,6];
let str = 'ababaddde';

let res1 = [...new Set(arr)];
console.log(res1); // [1, 2, 3, 4, 6]

let res2 = [...new Set(str)].join('');
console.log(res2); // "abde"

数组去重的另一种方法：

function dedupe(arr) {
  return Array.from(new Set(arr));
}

let res = dedupe([1,2,2,1,4,6]);
console.log(res);