Loop construct in Rust - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the basic syntax of an infinite loop in Rust?

In Rust, an infinite loop is created using the loop keyword followed by a block of code:<br>

loop {
    // code to repeat forever
}

beginner

How do you exit a loop early in Rust?

You use the break keyword to exit a loop before it naturally ends.<br>Example:<br>

loop {
    if condition {
        break;
    }
}

beginner

What is the difference between while and for loops in Rust?

while loops run as long as a condition is true.<br>for loops iterate over items in a collection or range.<br>Example:<br>

while x < 5 {
    x += 1;
}
for i in 0..5 {
    println!("{}", i);
}

intermediate

How can a loop return a value in Rust?

A <code>loop</code> can return a value by using <code>break</code> with a value.<br>Example:<br><pre>let result = loop {
    if condition {
        break 42;
    }
};
println!("{}", result); // prints 42</pre>

beginner

What is the purpose of the continue keyword in Rust loops?

continue skips the rest of the current loop iteration and moves to the next one.<br>Example:<br>

for i in 0..5 {
    if i == 2 {
        continue; // skip printing 2
    }
    println!("{}", i);
}

Which keyword creates an infinite loop in Rust?

A while

B for

C loop

D repeat

The loop keyword creates an infinite loop in Rust.

How do you stop a loop immediately in Rust?

A break

B exit

C stop

D return

The break keyword stops a loop immediately.

What does the continue keyword do inside a loop?

A Ends the loop

B Skips to the next iteration

C Restarts the program

D Pauses the loop

continue skips the rest of the current iteration and moves to the next.

Which loop type is best to iterate over a range of numbers in Rust?

A do-while

B while

C loop

D for

The for loop is used to iterate over ranges or collections.

How can a loop return a value in Rust?

A Using <code>break</code> with a value

B Using <code>yield</code>

C Using <code>continue</code> with a value

D Using <code>return</code> inside the loop

A loop returns a value by using break with that value.

Explain how to create and control loops in Rust, including how to exit or skip iterations.

Think about how you repeat tasks and stop or skip steps.

Describe how a loop can return a value in Rust and give an example.

Remember that break can send a value out of the loop.