Else–if ladder 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 > 0) {
  console.log('Positive');
} [1] {
  console.log('Not positive');
}

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

Aif (num === 0)

Bif (num < 0)

Celse

Delse if (num === 0)

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'else if' without a condition

Putting a condition after else

The else block runs when the if condition is false. Here, it covers all cases where num is not greater than 0.

2fill in blank

medium

Complete the code to check if a number is zero.

Javascript

if (num > 0) {
  console.log('Positive');
} else if ([1]) {
  console.log('Zero');
} else {
  console.log('Negative');
}

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

Anum === 0

Bnum = 0

Cnum > 0

Dnum < 0

Attempts:

3 left

💡 Hint

Common Mistakes

Using assignment '=' instead of comparison '==='

Using wrong comparison operators

The condition num === 0 checks if the number is exactly zero.

3fill in blank

hard

Fix the error in the else-if ladder to correctly check if a number is negative.

Javascript

if (num > 0) {
  console.log('Positive');
} else if (num === 0) {
  console.log('Zero');
} else if [1] {
  console.log('Negative');
}

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

Anum => 0

Bnum < 0

Cnum =< 0

D(num < 0)

Attempts:

3 left

💡 Hint

Common Mistakes

Missing parentheses around condition

Using wrong comparison operators like =< or =>

The condition must be inside parentheses in an else if statement. So (num < 0) is correct.

4fill in blank

hard

Fill both blanks to complete the else-if ladder that checks if a number is positive, zero, or negative.

Javascript

if (num [1] 0) {
  console.log('Positive');
} else if (num [2] 0) {
  console.log('Zero');
} else {
  console.log('Negative');
}

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

A>

B===

C<

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '>' for positive check

Using '==' instead of '===' for zero check

The first condition checks if num is greater than zero. The second checks if it is exactly zero.

5fill in blank

hard

Fill all three blanks to create an else-if ladder that prints if a number is positive, zero, or negative.

Javascript

if (num [1] 0) {
  console.log('Positive');
} else if (num [2] 0) {
  console.log('Zero');
} else if (num [3] 0) {
  console.log('Negative');
}

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

A>

B===

C<

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up comparison operators

Using '!=' instead of '===' for zero check

The conditions check if num is greater than zero, equal to zero, or less than zero respectively.