// Bubble Sort — the largest value "bubbles" to the end each pass.
// Just sort arr normally — every read and write is visualized for you.
const n = arr.length;
​
for (let i = 0; i < n - 1; i++) {
  for (let j = 0; j < n - i - 1; j++) {
    if (arr[j] > arr[j + 1]) {
      const tmp = arr[j];
      arr[j] = arr[j + 1];
      arr[j + 1] = tmp;
    }
  }
}
​