Here is the problem and solution to a coding challenge from Leetcode.com called Remove Duplicates from Sorted Array!

remove-duplicates-from-sorted-array.js

/**
 * @param {number[]} nums
 * @return {number}
 */
const removeDuplicates = function(nums) {
    let insertPointer = 1;
    for (let i = 1; i < nums.length; i++) {
        if (nums[i] !== nums[i - 1]) {
            nums[insertPointer] = nums[i];
            insertPointer++;
        }
    }
    return insertPointer;
};