/**
 * @param {number[]} nums
 * @param {number} val
 * @return {number}
 */
var removeElement = function(nums, val) {
    let j = 0
    for(let i = 0, size = nums.length; i<size; i++) {
        if(nums[i] !== val) {
            nums[j] = nums[i]
            j++
        }
    }
    return j
};

/**
 * @param {number[]} nums
 * @param {number} val
 * @return {number}
 */
var removeElement = function(nums, val) {
    let i = 0
    let n = nums.length
    while(i<n) {
        if(nums[i] === val) {
            nums[i] = nums[n-1]
            n--
        } else {
            i++
        }
    }
    return n
};