Map, fold etc. are implemented on the `Iterator` trait. [1,2,3].iter().map(|x| x + 1) https://doc.rust-lang.org/std/iter/trait.Iterator.html https://doc.rus

Map, fold etc. are implemented on the `Iterator` trait. [1,2,3].iter().map(|x| x + 1) https://doc.rust-lang.org/std/iter/trait.Iterator.html https://doc.rust-lang.org/std/iter/trait.Iterator.html