Switch statement in Javascript - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of switch with fall-through

What is the output of the following code?

Javascript

const value = 2;
switch(value) {
  case 1:
    console.log('One');
  case 2:
    console.log('Two');
  case 3:
    console.log('Three');
    break;
  default:
    console.log('Default');
}

A Two\nThree

B One\nTwo\nThree

C Three

D Default

💡 Hint

Remember that without break, cases fall through to the next.

The switch starts at case 2 and prints 'Two'. Because there is no break, it continues to case 3 and prints 'Three'. Then it hits break and stops.

❓ Predict Output

intermediate

Switch with string cases

What will this code print?

Javascript

const fruit = 'apple';
switch(fruit) {
  case 'banana':
    console.log('Banana');
    break;
  case 'apple':
    console.log('Apple');
    break;
  case 'orange':
    console.log('Orange');
    break;
  default:
    console.log('Unknown fruit');
}

A Banana

B Unknown fruit

C Orange

D Apple

💡 Hint

Check which case matches the string exactly.

The variable fruit is 'apple', so the case 'apple' matches and prints 'Apple'.

❓ Predict Output

advanced

Switch with multiple cases and default

What is the output of this code snippet?

Javascript

const num = 5;
switch(num) {
  case 1:
  case 3:
  case 5:
    console.log('Odd');
    break;
  case 2:
  case 4:
    console.log('Even');
    break;
  default:
    console.log('Unknown');
}

A Unknown

B Odd

C Even

D SyntaxError

💡 Hint

Multiple cases can share the same code block.

Number 5 matches case 5, which shares the block printing 'Odd'.

❓ Predict Output

advanced

Switch with expression and type coercion

What will this code print?

Javascript

const val = '2';
switch(val) {
  case 1:
    console.log('Number 1');
    break;
  case 2:
    console.log('Number 2');
    break;
  case '2':
    console.log('String 2');
    break;
  default:
    console.log('Default');
}

A String 2

B Number 2

C Default

D Number 1

💡 Hint

Switch uses strict equality (===) to compare values.

The variable val is the string '2'. It matches case '2' exactly, so it prints 'String 2'.

🧠 Conceptual

expert

Behavior of switch with no matching case and no default

What happens when a switch statement has no matching case and no default case?

A It executes the first case by default.

B It throws a ReferenceError at runtime.

C The switch block is skipped and no code inside runs.

D It causes an infinite loop.

💡 Hint

Think about what happens if no case matches and no default is present.

If no case matches and there is no default, the switch block does nothing and continues after it.