Why conditional logic is needed in Javascript - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if a number is positive.

Javascript

if (number [1] 0) {
  console.log('Positive number');
}

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

A!=

B<

C===

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' checks for negative numbers, not positive.

Using '===' checks for equality, not greater than.

We use the greater than symbol > to check if the number is more than zero, meaning positive.

2fill in blank

medium

Complete the code to print 'Even' if the number is divisible by 2.

Javascript

if (number [1] 2 === 0) {
  console.log('Even');
}

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

A-

B%

C+

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' or '-' will not check divisibility.

Using '*' multiplies, not divides.

The modulus operator % gives the remainder. If remainder is 0 when divided by 2, the number is even.

3fill in blank

hard

Fix the error in the condition to check if age is 18 or older.

Javascript

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

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.

Using '==' checks only for exactly 18.

We use >= to check if age is 18 or more, meaning adult.

4fill in blank

hard

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

Javascript

if (number [1] 10 && number [2] 20) {
  console.log('Between 10 and 20');
}

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

A>=

B<

C<=

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' for the first blank would exclude 10.

Using '>' for the second blank would exclude 20.

Use >= to check number is at least 10, and <= to check number is at most 20.

5fill in blank

hard

Fill all three 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([3]);
} else {
  console.log('Adult');
}

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

A<=

B<

C'Adult'

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>=' in first blank reverses logic.

Using '<' instead of '<=' in second blank excludes age 19.

Forgetting quotes around 'Adult'.

Use < to check if age is less than 12 for 'Child'. Then <= 19 for 'Teen'. Else print 'Adult'.