For loop in Javascript - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print numbers from 0 to 4 using a for loop.

Javascript

for (let i = 0; i [1] 5; i++) {
  console.log(i);
}

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

A==

B<=

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<=' will print 0 to 5, which is one extra number.

Using '==' or '>' will not create a proper loop condition.

The loop should run while i is less than 5 to print numbers 0 to 4.

2fill in blank

medium

Complete the code to sum numbers from 1 to 5 using a for loop.

Javascript

let sum = 0;
for (let num = 1; num [1] 5; num++) {
  sum += num;
}
console.log(sum);

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

A<

B>

C<=

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' excludes 5, so sum will be less than expected.

Using '==' will only run the loop once when num equals 5.

Using '<=' includes 5 in the sum, so numbers 1 through 5 are added.

3fill in blank

hard

Fix the error in the for loop to print each fruit in the array.

Javascript

const fruits = ['apple', 'banana', 'cherry'];
for (let i = 0; i [1] fruits.length; i++) {
  console.log(fruits[i]);
}

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

A<=

B<

C>

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<=' causes an error because fruits[fruits.length] is undefined.

Using '>' or '==' will not loop through the array correctly.

The loop should run while i is less than fruits.length to avoid going out of bounds.

4fill in blank

hard

Fill both blanks to create a for loop that counts down from 5 to 1.

Javascript

for (let i = [1]; i [2] 0; i--) {
  console.log(i);
}

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

A5

B>

C>=

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Starting at 0 will not count down from 5.

Using '>=' will print 0 as well.

Start at 5 and continue while i is greater than 0 (i > 0).

5fill in blank

hard

Fill all three blanks to create a for loop that prints even numbers from 2 to 10.

Javascript

for (let i = [1]; i [2] 10; i [3]) {
  console.log(i);
}

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

A2

B<=

C+= 2

D++

Attempts:

3 left

💡 Hint

Common Mistakes

Using '++' increases by 1, so odd numbers will be printed.

Starting at 0 or 1 will not print the correct even numbers.

Start at 2, loop while i is less than or equal to 10, and increase i by 2 each time.