Why conditional logic is needed in Javascript - Challenge Your Understanding

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this conditional code?

Look at this JavaScript code. What will it print to the console?

Javascript

const age = 20;
if (age >= 18) {
  console.log('Adult');
} else {
  console.log('Minor');
}

A "Adult"

B "Minor"

C undefined

D SyntaxError

💡 Hint

Check the condition if age is 18 or more.

Since age is 20, which is greater than or equal to 18, the code prints "Adult".

🧠 Conceptual

intermediate

Why do we use conditional logic in programs?

Choose the best reason why conditional logic is important in programming.

A To repeat the same code many times

B To make decisions and run different code based on conditions

C To store data permanently

D To make the program run faster

💡 Hint

Think about how a program chooses what to do next.

Conditional logic lets programs decide what to do based on different situations or inputs.

❓ Predict Output

advanced

What will this nested conditional code output?

Check the output of this JavaScript code with nested if-else statements.

Javascript

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

A "Grade A"

B ReferenceError

C "Grade C"

D "Grade B"

💡 Hint

Look at the score and check which condition it meets first.

Score 75 is not >= 90 but is >= 70, so it prints "Grade B".

🔧 Debug

advanced

Which option causes an error in this conditional code?

Find which code snippet will cause an error when run.

Javascript

const temperature = 30;
if temperature > 25 {
  console.log('Hot');
} else {
  console.log('Cold');
}

A if temperature > 25 { console.log('Hot'); } else { console.log('Cold'); }

B if (temperature > 25) { console.log('Hot'); } else { console.log('Cold'); }

C if (temperature > 25) console.log('Hot'); else console.log('Cold');

D temperature > 25 ? console.log('Hot') : console.log('Cold');

💡 Hint

Check the syntax of the if statement carefully.

Option A is missing parentheses around the condition, causing a SyntaxError.

🚀 Application

expert

What is the value of variable result after this code runs?

Consider this code using conditional logic and the ternary operator. What is the final value of result?

Javascript

const num = 10;
const result = num % 2 === 0 ? 'Even' : 'Odd';

A 10

B "Odd"

C "Even"

D undefined

💡 Hint

Check if 10 is divisible by 2 without remainder.

10 % 2 equals 0, so the condition is true and result is set to "Even".