能用数组前面的知识解答嘛？

Question

定义数组arr，值为a、b、b、c、d、d，去掉重复的字符，得到新的数组arr2，值为a、b、c、d

Answer 1

let arr1=['a','b','c','d','d'];
let arr2=[...new Set(arr1)];
console.log(arr2);