Sorting Algorithms (bubble sort, merge sort)

What aspect of algorithm analysis does this implementation help understand?
function bubbleSortWithStats(arr) {
  let swaps = 0, comparisons = 0;
  for(let i = 0; i < arr.length; i++) {
    for(let j = 0; j < arr.length - i - 1; j++) {
      comparisons++;
      if(arr[j] > arr[j + 1]) {
        [arr[j], arr[j + 1]] = [arr[j + 1], arr[j]];
        swaps++;
      }
    }
  }
  return { sorted: arr, swaps, comparisons };
}
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