If–else statement in Javascript - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if a number is positive.

Javascript

if (num [1] 0) {
  console.log('Positive');
} else {
  console.log('Not positive');
}

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

A===

B!==

C<

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '===' instead of '>' will only check if num equals zero.

Using '<' will check if the number is negative, not positive.

The condition 'num > 0' checks if the number is greater than zero, meaning it is positive.

2fill in blank

medium

Complete the code to print 'Even' if the number is even.

Javascript

if (num % 2 [1] 0) {
  console.log('Even');
} else {
  console.log('Odd');
}

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

A!==

B>

C===

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '!== 0' will check for odd numbers instead of even.

Using '>' or '<' does not correctly check for evenness.

The condition 'num % 2 === 0' checks if the remainder when dividing by 2 is zero, meaning the number is even.

3fill in blank

hard

Fix the error in the if condition to check if age is at least 18.

Javascript

if (age [1] 18) {
  console.log('Adult');
} else {
  console.log('Minor');
}

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

A>=

B<=

C<

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' or '<=' checks for younger ages, not adults.

Using '==' only checks if age equals 18 exactly.

The condition 'age >= 18' checks if age is 18 or older, meaning adult.

4fill in blank

hard

Fill both blanks to check if a number is between 10 and 20 (inclusive).

Javascript

if (num [1] 10 && num [2] 20) {
  console.log('Between 10 and 20');
} else {
  console.log('Outside range');
}

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

A>=

B<

C<=

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' or '<' alone excludes the boundary numbers 10 or 20.

Mixing up the operators order can cause wrong logic.

The condition 'num >= 10 && num <= 20' checks if num is between 10 and 20 including both ends.

5fill in blank

hard

Fill both blanks to create an if-else that prints 'Child', 'Teen', or 'Adult' based on age.

Javascript

if (age [1] 12) {
  console.log('Child');
} else if (age [2] 19) {
  console.log('Teen');
} else {
  console.log('Adult');
}

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

A<=

B<

C>=

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>=' in the first condition would reverse logic.

Using '>' in the else if condition would cause wrong grouping.

The code checks if age is less than or equal to 12 for 'Child', less than 19 for 'Teen', else 'Adult'.