Bubble sort (JavaScript)sort array to Asc/Desc order

bubbleSort.js

const arr = [-2, 45, 0, 11, -9];

/*
 * Bubble sort is a sorting algorithm that compares two adjacent elements and swaps them until they are in the intended order.
 */
function bubbleSort(arr) {
  // loop to access each array element
  for (let i = 0; i < arr.length; i++) {
    
    //  keep track of swapping
    let swap = false;
    
    // loop to compare two elements
    for (let j = 0; j < (arr.length - i); j++ ) {
      // compare two array elements
      // change > to < to sort in descending order
      if (arr[j] > arr[j + 1]) {
        // swap if elements are not in intended order.
        const oldJ = arr[j];
        arr[j] = arr[j+1];
        arr[j + 1] = oldJ;
        swap = true;
      }
    }
    // no swapping means the array is already sorted so no need of further comparison.
    if (!swap) break;
  }
  return arr;
}
console.log(bubbleSort(arr))