Remove Element

Given an integer array nums and an integer val, remove all occurrences of val in-place. The order of the remaining elements can be changed. Return the number of elements in nums which are not equal to val. The first k elements of nums should hold the result (where k is the returned value).

Input:  nums = [3,2,2,3], val = 3
Output: 2, nums = [2,2,_,_]

function removeElement(nums, val) {
  let k = 0; // write index for elements != val
  for (let i = 0; i < nums.length; i++) {
    if (nums[i] !== val) {
      nums[k] = nums[i];
      k++;
    }
  }
  return k;
}