Remove Duplicates from Sorted Array

LeetCode題目: 26. Remove Duplicates from Sorted Array

My solution:

/**
 * @param {number[]} nums
 * @return {number}
 */
let removeDuplicates = nums => {
    let k = 0;
    let set = new Set();
    for(let i=0; i<nums.length; i++) {
        if(!set.has(nums[i])) {
            nums[k++] = nums[i];
            set.add(nums[i]);
        }
    }
    nums.splice(k);
    return k;
};