27-Remove-Element.js

/**
 * @param {number[]} nums
 * @param {number} val
 * @return {number}
 */
var removeElement = function(nums, val) {
    let k = 0;

    for (let i = 0; i < nums.length; ++i) {
        if (nums[i] !== val) {
            nums[k] = nums[i];
            k++;
        }
    }
    return k;
};