Loop with break in Rust - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the break keyword do inside a Rust loop?

The break keyword immediately stops the loop and exits it, continuing with the code after the loop.

intermediate

How can you use break to return a value from a loop in Rust?

You can add a value after break, like break value;. This value becomes the result of the loop expression.

intermediate

What happens if you use break inside a nested loop?

The break only exits the innermost loop where it is called, not outer loops.

beginner

Can break be used in while and for loops in Rust?

Yes, break works in all loop types: loop, while, and for to stop the loop early.

beginner

Example: What will this Rust code print?<br><pre>let mut count = 0;<br>loop {<br>  count += 1;<br>  if count == 3 {<br>    break;<br>  }<br>}<br>println!("{}", count);</pre>

It will print 3 because the loop increments count until it reaches 3, then breaks out of the loop.

What does break do inside a Rust loop?

A Does nothing

B Stops the loop immediately and exits it

C Restarts the loop from the beginning

D Skips the current iteration and continues

break stops the loop immediately and exits it.

How do you return a value from a Rust loop using break?

A Use <code>break value;</code> to return a value

B You cannot return a value from a loop

C Use <code>return value;</code> inside the loop

D Use <code>continue value;</code>

You can write break value; to return a value from the loop.

If you have nested loops, which loop does break exit?

A The outermost loop

B All loops at once

C The innermost loop where <code>break</code> is called

D None of the loops

break exits only the innermost loop where it is used.

Can break be used in a for loop in Rust?

A No, only in <code>loop</code>

B Only in functions

C Only in <code>while</code> loops

D Yes, it works in <code>for</code> loops

break works in all loop types including for loops.

What will this code print?<br>

let mut i = 0;<br>while i < 5 {<br>  if i == 2 {<br>    break;<br>  }<br>  i += 1;<br>}<br>println!("{}", i);

A 2

B 5

C 0

D Infinite loop

The loop breaks when i is 2, so it prints 2.

Explain how the break keyword works in Rust loops and how it can be used to return a value.

Think about how to stop a loop early and get a result from it.

Describe what happens when break is used inside nested loops in Rust.

Consider which loop the break applies to.