Else–if ladder in Javascript - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of else-if ladder with numeric input

What is the output of this JavaScript code?

let score = 75;
if (score >= 90) {
  console.log('Grade A');
} else if (score >= 80) {
  console.log('Grade B');
} else if (score >= 70) {
  console.log('Grade C');
} else {
  console.log('Grade F');
}

Javascript

let score = 75;
if (score >= 90) {
  console.log('Grade A');
} else if (score >= 80) {
  console.log('Grade B');
} else if (score >= 70) {
  console.log('Grade C');
} else {
  console.log('Grade F');
}

A Grade F

B Grade B

C Grade A

D Grade C

💡 Hint

Check which condition matches the score 75 first.

The code checks conditions from top to bottom. Since 75 is not >= 90 or >= 80 but is >= 70, it prints 'Grade C'.

❓ Predict Output

intermediate

Output when all conditions fail in else-if ladder

What will this code print?

let temperature = 10;
if (temperature > 30) {
  console.log('Hot');
} else if (temperature > 20) {
  console.log('Warm');
} else if (temperature > 15) {
  console.log('Mild');
} else {
  console.log('Cold');
}

Javascript

let temperature = 10;
if (temperature > 30) {
  console.log('Hot');
} else if (temperature > 20) {
  console.log('Warm');
} else if (temperature > 15) {
  console.log('Mild');
} else {
  console.log('Cold');
}

A Mild

B Cold

C Warm

D Hot

💡 Hint

Check if 10 is greater than any of the conditions.

10 is not greater than 30, 20, or 15, so the else block runs printing 'Cold'.

❓ Predict Output

advanced

Output of else-if ladder with string comparison

What does this code print?

let day = 'Sunday';
if (day === 'Monday') {
  console.log('Start of work week');
} else if (day === 'Friday') {
  console.log('End of work week');
} else if (day === 'Saturday' || day === 'Sunday') {
  console.log('Weekend');
} else {
  console.log('Midweek');
}

Javascript

let day = 'Sunday';
if (day === 'Monday') {
  console.log('Start of work week');
} else if (day === 'Friday') {
  console.log('End of work week');
} else if (day === 'Saturday' || day === 'Sunday') {
  console.log('Weekend');
} else {
  console.log('Midweek');
}

A Start of work week

B Midweek

C Weekend

D End of work week

💡 Hint

Check the condition that matches 'Sunday'.

'Sunday' matches the third else-if condition, so it prints 'Weekend'.

❓ Predict Output

advanced

Output when else-if ladder conditions overlap

What will this code print?

let num = 5;
if (num > 0) {
  console.log('Positive');
} else if (num > 3) {
  console.log('Greater than three');
} else {
  console.log('Other');
}

Javascript

let num = 5;
if (num > 0) {
  console.log('Positive');
} else if (num > 3) {
  console.log('Greater than three');
} else {
  console.log('Other');
}

A Positive

B Greater than three

C Other

D No output

💡 Hint

Remember else-if ladder stops at first true condition.

Since num=5 is > 0, the first if block runs and prints 'Positive'. The else-if is skipped.

❓ Predict Output

expert

Output of else-if ladder with nested conditions and variable changes

What is the output of this code?

let x = 10;
if (x > 5) {
  if (x < 15) {
    x += 5;
  } else if (x === 15) {
    x += 10;
  }
} else if (x === 10) {
  x -= 5;
}
console.log(x);

Javascript

let x = 10;
if (x > 5) {
  if (x < 15) {
    x += 5;
  } else if (x === 15) {
    x += 10;
  }
} else if (x === 10) {
  x -= 5;
}
console.log(x);

A 15

B 20

C 5

D 10

💡 Hint

Trace the nested if conditions carefully.

x starts at 10, which is > 5 and < 15, so x += 5 runs making x = 15. The else-if inside does not run. The outer else-if is skipped.