Remove duplicates from array javscript

removeDuplicates.js

/**
 * @param {number[]} nums
 * @return {number}
 */
var removeDuplicates = function(nums) {
   nums.forEach((num,i) => {
       if(nums[i+1] !== null && nums[i+1] == nums[i] ){
            nums.splice(i, 1);
           console.log(nums)
           removeDuplicates(nums)
       }
      })
    return nums.length;
};

//O(n^2)
//repassing array for no reason
//
/**
 * @param {number[]} nums
 * @return {number}
 */
var removeDuplicates = function(nums) {
    if(nums.length == 0) return 0;

    let i = 0;
    for (let j = 1; j < nums.length; j ++){
        if(nums[j] !== nums[i]){
           i++;
           nums[i] = nums[j];
        }
    }

    return i + 1
};