It is a non-obvious Rust-ism that if you’re doing something with iterators and you don’t know how, it’s probably .collect(). ;-) Kind of like how the answer is

It is a non-obvious Rust-ism that if you’re doing something with iterators and you don’t know how, it’s probably .collect(). ;-) Kind of like how the answer is always ‘traverse’ in Scala. .collect() gets overloaded a lot to deal with the intricacies of the return type, which usually says a lot about the computation, e.g. Result or HashSet.