Where do I Belong testcase fail

Tell us what’s happening:
when null array is passes, it fails to retun 0, although it is specified.
return arr.length;

Your code so far

function getIndexToIns(arr, num) {
  // Find my place in this sorted array.
  arr.sort(function(a,b) { return a - b; });
  for(var i = 0;i<arr.length;i++)
    if(arr[i]<num && arr[i+1]>=num)
      return i+1;
      return arr.length;
     if(arr[i]<=num && arr[i+1]>num)
      return i;
    return arr.length;
  return arr;
getIndexToIns([], 1);

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Link to the challenge:

I can’t debug your code now as I am not on computer, but you can remove the if statements that don’t have an i inside from the loop.

How can the if statement that execute for arr.length === 0 if in that case i can’t be less than 0 as it starts at 0? (Remember the condition of the loop, i < arr.length, the body loop is executed only if this is true, and 0 < 0 is false)

The other one about last element of the array is also not needed inside the array, as it doesn’t have a i inside, so you can move it above.

One of these statements can become first thing of the function , the other needs to be written after something else.

All of your if statements occur inside of a loop, but that loop only runs if i is less than the length of the array. When the array is empty, it’s length is 0. Since i is never less than arr.length the code inside of the for loop never runs, so your if(arr.length===0) will never be true.