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Rust 1.30.1
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Iterators

There is a new edition of the book and this is an old link.

The iterator pattern allows you to perform some task on a sequence of items in turn. An iterator is responsible for the logic of iterating over each item and determining when the sequence has finished.

let v1 = vec![1, 2, 3];

let v1_iter = v1.iter();

for val in v1_iter {
    println!("Got: {}", val);
}Run

Here are the relevant sections in the new and old books: