Summary

for loops iterate over the values in an Iterator

Iterator is a trait that represents a stream of values

Range expressions like 1..11 or 1..=10 are one kind of Iterator

Many types provide an IntoIterator implementation, including Vec and slices

With the rule of 3, you can get:

• Moved iterators of values (.into_iter())

• Reference iterators (borrow the value, or .iter())

• Mutable reference iterators (mutably borrow the value, or .iter_mut())

To iterate on a string slice, you need to choose either .chars() or .bytes()

You can write generic iterator functions using Iterator as a trait bound

Iterators have a lot more power for the future, allowing a lot of functional programming