Rust’s Iterator trait is one of its most useful features. It allows lazy processing of item-by-item streams of anything from the bytes of a file to threads to complex and exotic data structures. Most of the useful functionality, though, is provided by combinators, functions that allow us to combine iterators and process them in useful ways. These include map, fold, filter, and many other useful functions (including those from the excellent itertools crate). Concision and Clarity Consider th...
