Idiomatic Rust

This skill is about expression: what form does a Rust reader expect to see?

The shape of idiomatic Rust

Prefer expressions over statements: a match that returns a value beats one that assigns to a let mut in every arm, and a chain that produces the answer beats a flag variable set in a loop and checked after it — let the type system carry invariants instead of runtime checks. let ... else keeps an early return at the top instead of drifting the happy path rightward under a nested if let; matches! is the boolean test on a pattern. If-let chains compose conditions where the toolchain supports them — a recent edition, so check the repo MSRV first.

Iterators