Break statement in Javascript - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this code using break in a loop?

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

Javascript

let result = '';
for (let i = 0; i < 5; i++) {
  if (i === 3) {
    break;
  }
  result += i;
}
console.log(result);

A "012"

B "01234"

C "123"

D "0123"

💡 Hint

Remember, break stops the loop immediately when the condition is met.

The loop adds numbers 0, 1, and 2 to the string. When i becomes 3, the break stops the loop before adding 3.

❓ Predict Output

intermediate

What happens when break is inside a nested loop?

What will this code print to the console?

Javascript

let output = '';
for (let i = 0; i < 3; i++) {
  for (let j = 0; j < 3; j++) {
    if (j === 1) {
      break;
    }
    output += `${i}${j} `;
  }
}
console.log(output.trim());

A "00 01 02 10 11 12 20 21 22"

B "00 01 10 11 20 21"

C "00 10 20"

D "00 10 20 21"

💡 Hint

Break only stops the inner loop, not the outer one.

The inner loop breaks when j equals 1, so only j=0 is added for each i. The outer loop continues for i=0,1,2.

❓ Predict Output

advanced

What is the output when break is used inside a switch statement?

Check the code below. What will it print?

Javascript

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

A "Two\nThree"

B "Two"

C "One\nTwo"

D "One\nTwo\nThree"

💡 Hint

Remember that break stops the switch from continuing to the next cases.

Since value is 2, it matches case 2 and prints 'Two'. The break stops further cases from running.

❓ Predict Output

advanced

What error does this code raise?

What error will this code cause when run?

Javascript

while (true) {
  if (false) {
    break;
  }
  console.log('Looping');
  break;
  break;
}

A SyntaxError

B Infinite loop

C TypeError

D No error, prints 'Looping' once

💡 Hint

Multiple break statements in a row are allowed but some may be unreachable.

The code prints 'Looping' once and then breaks out of the loop. No syntax or runtime error occurs.

🧠 Conceptual

expert

Which option correctly explains break behavior in nested loops?

In JavaScript, what does the break statement do inside nested loops?

A Break exits only the innermost loop where it is called.

B Break exits all loops regardless of nesting level.

C Break exits the outermost loop only.

D Break pauses the loop but continues after a delay.

💡 Hint

Think about which loop the break is inside.

Break stops the closest loop it is inside. Outer loops continue unless they also have a break.