LeetCode - 26 - Remove Duplicates from Sorted Array

 /**

 * @param {number[]} nums
 * @return {number}
 */
var removeDuplicates = function(nums) {
    var index = 0;
    var last = 200;
    for(const num of nums) {
        if (num != last) {
            nums[index] = num;
            index++;
        }
        last = num;
    }
    return index;
};