What could be causing my for loop to unexpectedly terminate early?

I'm currently tackling a challenge on CodeChefs:

My task is to find the smallest missing positive integer in an unsorted list of numbers. Here's the code snippet I've implemented:

var firstMissingPositive = function(nums) {
    nums.sort();
    let x = 1;
    for (let num in nums) {
      if (nums[num] <= 0) continue; 
      else if (nums[num] != x) break; 
      else x++;
    }
    return x;
};

Although this code successfully solves most test cases, it fails to pass a seemingly simple scenario -

nums = [1,2,3,4,5,6,7,8,9,20];

Instead of returning the expected output of 10, it gives me 3.

While I'm not expecting a direct solution, I'm curious as to why my loop breaks at 3 after handling 1 and 2 correctly. Any insights would be greatly appreciated!

Answer №1

Identifying the main cause of your issue (mdn):

The sort() function rearranges the elements within an array and then returns the sorted array. By default, the sorting is done in an ascending order by converting the elements into strings and comparing their sequences of UTF-16 code units values.

After applying the sort method, you might end up with [1, 2, 20, 3, ...], since '20' as a string comes before '3'. One potential solution to this issue is to enforce numeric sorting:

nums.sort((a, b) => a - b);

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