Where do I belong JavaScript

Tell us what’s happening:

Your code so far

function getIndexToIns(arr, num) {
  arr = Array.sort();
  
  for (var i = 0; i < arr.length; i++) {
    if (num <= arr[i]) {
      return arr[i][0];
    }
  }

  return arr.length;
}

getIndexToIns([40, 60], 50);

Your browser information:

Your Browser User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36.

Link to the challenge:
https://www.freecodecamp.org/challenges/where-do-i-belong

My code does not work for this challenge I don’t get why it’s wrong.

@camperextraordinaire Strike Again!!
da da daaa

Can’t wait to get to that part.