Return inside loops in Javascript - Cheat Sheet & Quick Revision

Recall & Review

beginner

What happens when a return statement is executed inside a loop in a function?

The function immediately stops running and returns the specified value. The loop and the rest of the function do not continue.

intermediate

Can a return statement inside a loop return different values on different iterations?

Yes, if the return depends on a condition inside the loop, it can return different values depending on which iteration triggers it first.

beginner

What is the difference between return inside a loop and continue inside a loop?

return stops the entire function and returns a value. continue skips the current loop iteration and moves to the next one without stopping the function.

beginner

Consider this code snippet:<br><pre>function findFirstEven(arr) {
  for (let num of arr) {
    if (num % 2 === 0) {
      return num;
    }
  }
  return null;
}</pre><br>What does this function do?

It loops through the array and returns the first even number it finds. If no even number is found, it returns null.

beginner

Is it possible for code after a return inside a loop to run?

No. Once return runs, the function ends immediately. Any code after it inside the loop or function will not run.

What happens when a return statement is executed inside a loop in a function?

A Nothing, the return is ignored inside loops.

B The loop skips to the next iteration.

C The loop finishes all iterations before returning.

D The function stops and returns the value immediately.

The return statement immediately ends the function and returns the value, even if inside a loop.

If a return is inside a loop, can the loop continue after the return?

A No, the function ends immediately.

B Yes, the loop continues normally.

C Only if the return is inside an <code>if</code> statement.

D Only in asynchronous functions.

When return runs, the whole function stops immediately, so the loop cannot continue.

What is the difference between return and continue inside a loop?

A Both end the function immediately.

B <code>return</code> skips iteration; <code>continue</code> ends function.

C <code>return</code> ends the function; <code>continue</code> skips to next loop iteration.

D Both skip to the next iteration.

return stops the function and returns a value. continue skips the current loop iteration and continues looping.

In this code, what will be the output?<br>

function test() {
  for (let i = 0; i < 5; i++) {
    if (i === 2) return i;
  }
  return -1;
}
console.log(test());

A 0

B 2

C -1

D 5

The function returns 2 when i === 2 and stops immediately.

If no return is executed inside a loop, what happens after the loop ends?

A The function continues running any code after the loop.

B The function ends automatically.

C The loop runs again infinitely.

D The function returns <code>undefined</code> immediately.

If no return happens inside the loop, the function continues running code after the loop normally.

Explain what happens when a return statement is used inside a loop in a JavaScript function.

Think about how <code>return</code> affects function flow.

Describe a real-life example where returning inside a loop is useful in programming.

Imagine looking for something in a list and stopping once found.