Bubble Sort Gives Up Early

The leaderboard is only "kind of" sorted — the top score is right, the rest are not.

bubbleSort(arr) sorts the array ascending in place (optimised bubble sort) and returns it.

Fix the code so every test passes. Keep the function name bubbleSort.

Test cases

• bubbleSort([5,3,4,1,2]) → [1,2,3,4,5]
• bubbleSort([2,1]) → [1,2]
• bubbleSort([3,1,2]) → [1,2,3]
• bubbleSort([1,2,3]) → [1,2,3]

Stuck? Hints go from a nudge to the exact fix.