Bubble Sort Algorithm in DSA Javascript - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to swap two elements in the array.

DSA Javascript

let temp = arr[[1]];
arr[[1]] = arr[j];
arr[j] = temp;

Drag options to blanks, or click blank then click option'

A0

Bj

Ci

Darr.length

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong index like 0 or arr.length causes incorrect swaps.

Swapping with the same index does nothing.

We use 'i' as the index to swap with 'j' during the bubble sort pass.

2fill in blank

medium

Complete the code to compare adjacent elements for swapping.

DSA Javascript

if (arr[j] [1] arr[j + 1]) {
  // swap
}

Drag options to blanks, or click blank then click option'

A>

B<=

C===

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' will sort in descending order, not ascending.

Using '===' will never swap.

We swap if the current element is greater than the next to sort in ascending order.

3fill in blank

hard

Fix the error in the loop condition to avoid out-of-bound errors.

DSA Javascript

for (let j = 0; j < arr.length [1] 1; j++) {
  // compare and swap
}

Drag options to blanks, or click blank then click option'

A+

B/

C*

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' causes index out of range errors.

Using '*' or '/' makes no sense here.

We subtract 1 to avoid accessing arr[j + 1] beyond array length.

4fill in blank

hard

Fill both blanks to complete the outer loop and inner loop for bubble sort.

DSA Javascript

for (let i = 0; i [1] arr.length; i++) {
  for (let j = 0; j [2] arr.length - i - 1; j++) {
    // compare and swap
  }
}

Drag options to blanks, or click blank then click option'

A<

B<=

C>

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<=' causes index out of range errors.

Using '>' or '>=' causes loops not to run.

Both loops run with '<' to iterate correctly over indices.

5fill in blank

hard

Fill all three blanks to complete the bubble sort function.

DSA Javascript

function bubbleSort(arr) {
  for (let i = 0; i [1] arr.length; i++) {
    for (let j = 0; j [2] arr.length - i - 1; j++) {
      if (arr[j] [3] arr[j + 1]) {
        let temp = arr[j];
        arr[j] = arr[j + 1];
        arr[j + 1] = temp;
      }
    }
  }
  return arr;
}

Drag options to blanks, or click blank then click option'

A<

B>

C<=

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<=' in loops causes index errors.

Using '<' in swap condition sorts descending.

Using '>=' or '<=' in swap condition causes no swaps.

Outer and inner loops use '<' to iterate; swap if current element is greater than next.