What is the purpose of break and continue?

JavaScript

The short answer

break exits a loop entirely — no more iterations run. continue skips the current iteration and jumps to the next one. Both give you control over loop execution flow.

break

for (let i = 0; i < 10; i++) {
  if (i === 5) break; // exits the loop
  console.log(i);
}
// Output: 0, 1, 2, 3, 4

Common use: stop searching once you find what you need:

const users = [
  { name: 'Alice' },
  { name: 'Bob' },
  { name: 'Charlie' },
];
let found;
for (const user of users) {
  if (user.name === 'Bob') {
    found = user;
    break; // no need to check the rest
  }
}

continue

for (let i = 0; i < 10; i++) {
  if (i % 2 === 0) continue; // skip even numbers
  console.log(i);
}
// Output: 1, 3, 5, 7, 9

Common use: skip items that do not meet a condition without nesting inside if:

for (const item of items) {
  if (!item.active) continue;
  processItem(item);
}

In switch statements

break is also used in switch to prevent fall-through:

switch (color) {
  case 'red':
    console.log('Stop');
    break; // without this, it falls through to the next case
  case 'green':
    console.log('Go');
    break;
}

Interview Tip

Show one example of each with a for loop. Mention that break is also used in switch statements. This is a basic question — keep it short.

Why interviewers ask this

This tests fundamental control flow knowledge. It is a simple question usually asked in early-career interviews.

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