whats the difference between Iter and into_iter rust

The Iter and IntoIter types in Rust are both iterators, but they have some differences in how they work.

The Iter type is a reference-based iterator, meaning it borrows the elements from the collection it iterates over. It is created by calling the iter method on a collection. The Iter type provides read-only access to the elements, allowing you to iterate over them and perform operations on them, but you cannot modify the original collection through the Iter.

On the other hand, the IntoIter type is an owned iterator, meaning it takes ownership of the elements from the collection. It is created by calling the into_iter method on a collection. The IntoIter type allows you to both read and modify the elements, as it has full ownership over them. This means you can mutate the original collection through the IntoIter.

In summary, the main difference between Iter and IntoIter in Rust is the ownership semantics. Iter borrows the elements from the collection, providing read-only access, while IntoIter takes ownership of the elements, allowing both read and write access.

It's worth noting that these are just conventions and not hard rules. The specific behavior can vary depending on the implementation of the iterator for a particular collection type in Rust.