删除数组中的重复项-26

力扣（LeetCode） 链接：https://leetcode.cn/problems/remove-duplicates-from-sorted-array/discussion/

var removeDuplicates = function (nums) {
  let slow = 0
  let fast = 0
  while (fast < nums.length) {
    if (nums[fast] !== nums[slow]) {
      slow++
      nums[slow] = nums[fast]
    }
    fast++
  }
  return slow + 1
}