freeCodeCamp Challenge Guide: Sorting algorithms/Comb sort

Guide
1

Sorting algorithms/Comb sort

Solutions

Solution 1 (Click to Show/Hide) 
function combSort(arr) {
  function is_array_sorted(arr) {
    var sorted = true;
    for (var i = 0; i < arr.length - 1; i++) {
      if (arr[i] > arr[i + 1]) {
        sorted = false;
        break;
      }
    }
    return sorted;
  }
  var iteration_count = 0;
  var gap = arr.length - 2;
  var decrease_factor = 1.25;

  // Until array is not sorted, repeat iterations
  while (!is_array_sorted(arr)) {
    // If not first gap
    if (iteration_count > 0)
      // Calculate gap
      gap = (gap == 1) ? gap : Math.floor(gap / decrease_factor);

    // Set front and back elements and increment to a gap
    var front = 0;
    var back = gap;
    while (back <= arr.length - 1) {
      // If elements are not ordered swap them
      if (arr[front] > arr[back]) {
        var temp = arr[front];
        arr[front] = arr[back];
        arr[back] = temp;
      }

      // Increment and re-run swapping
      front += 1;
      back += 1;
    }
    iteration_count += 1;
  }

  return arr;
}