While loop in Javascript - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print numbers from 1 to 5 using a while loop.

Javascript

let i = 1;
while (i [1] 5) {
  console.log(i);
  i++;
}

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

A>

B<

C>=

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'i < 5' which stops at 4.

Using 'i > 5' which never runs the loop.

The condition i <= 5 ensures the loop runs while i is 1 through 5.

2fill in blank

medium

Complete the code to stop the loop when the variable 'count' reaches 10.

Javascript

let count = 0;
while (count [1] 10) {
  console.log(count);
  count++;
}

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

A<

B>

C<=

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'count <= 10' which runs one extra time.

Using 'count > 10' which never runs the loop.

Using 'count < 10' stops the loop before count reaches 10, so it prints 0 to 9.

3fill in blank

hard

Fix the error in the loop condition to avoid an infinite loop.

Javascript

let n = 5;
while (n [1] 0) {
  console.log(n);
  n--;
}

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

A<=

B>

C>=

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'n >= 0' which runs one extra time including 0.

Using 'n < 0' which never runs the loop.

Using 'n > 0' ensures the loop stops when n reaches 0, preventing an infinite loop.

4fill in blank

hard

Fill both blanks to create a loop that prints even numbers from 2 to 10.

Javascript

let num = [1];
while (num [2] 10) {
  console.log(num);
  num += 2;
}

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

A2

B<=

C<

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Starting at 0 which prints 0 as well.

Using '<' which stops before printing 10.

Start at 2 and loop while num is less than or equal to 10 to print even numbers up to 10.

5fill in blank

hard

Fill all three blanks to create a loop that counts down from 9 to 1.

Javascript

let i = [1];
while (i [2] [3]) {
  console.log(i);
  i--;
}

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

A9

B>

C0

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' which would never run the loop.

Using 1 instead of 0 which stops too early.

Start at 9 and loop while i is greater than 0 to count down to 1.