Question 1

Which trait must a type implement to be usable in a for loop in Rust?

Accepted Answer

The IntoIterator trait allows a type to be converted into an iterator. The for loop automatically calls into_iter() on the expression. Types like Vec, arrays and ranges implement this trait by default, which allows iterating over them directly with for.

Question 2

Which method of the Iterator trait must be implemented?

Accepted Answer

The next() method is the only required method of the Iterator trait. It returns Option<Self::Item>, either Some(item) if there are remaining elements, or None when iteration is complete. All other methods like map, filter or collect have default implementations based on next().

Question 3

What is the difference between iter(), iter_mut() and into_iter() on a Vec<T>?

Accepted Answer

iter() returns an iterator over immutable references (&T), iter_mut() over mutable references (&mut T), and into_iter() consumes the Vec and returns elements by value (T). The choice depends on whether you want to read, modify or take ownership of the elements.

Iterators & Closures

Which trait must a type implement to be usable in a for loop in Rust?

Antwort

Which method of the Iterator trait must be implemented?

Antwort

What is the difference between iter(), iter_mut() and into_iter() on a Vec<T>?

Antwort

What is a lazy iterator in Rust and why is it important?

What is the correct syntax to define a closure that takes two i32 parameters and returns their sum?

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