/**
 * @param {number[]} nums
 * @return {number}
 */
var removeDuplicates = function(nums) {
      let p1 = 0,lastVal =nums[0] -1;
  for (let i = 0; i < nums.length; i++) {
    if (nums[i] != lastVal) {
      nums[p1] = nums[i];
      lastVal = nums[i]
      p1 +=1;

    }

  }
nums.length = p1;
 console.log(nums);
};