js数组去重

Set

let arr = [1, 2, 3, 3, 3, 3];
let newArr = [...new Set(arr)];
console.log(newArr);

Map

const arr = ["aaa", "3", "bbbb", "test", 3, 3];

function unique(arr) {
  const map = new Map();
  for (let i = 0; i < arr.length; i++) {
    if (!map.has(arr[i])) {
      map.set(arr[i], true);
    }
  }

  return [...map.keys()];
}

console.log(unique(arr));