编辑代码

// 快慢指针
function removeRepeat1(arr) {
    arr.sort((a,b) => a - b);
    let slow = 0;
    for (let fast = 0; fast < arr.length; fast++) {
        if(arr[fast] !== arr[slow]) {
            slow++;
            arr[slow] = arr[fast];
        }
    }
    return arr.slice(0, slow + 1)
}
// 双指针
function removeRepeat2(arr) {
    arr.sort((a,b) => a - b);
    let j = 0;
    for (let i = 0; i < arr.length; i++) {
        if(arr[i] !== arr[i+1]) {
            j++;
            arr[j] = arr[i+1];
        }
    }
    return arr.slice(0, j + 1)
}
const arr = [2,4,65,23,33,44,44,44];
console.log(removeRepeat2(arr))