No, but it’s widely acknowledged that functional programming features are useful even in imperative languages. Almost every imperative language that isn’t C, Go

No, but it’s widely acknowledged that functional programming features are useful even in imperative languages. Almost every imperative language that isn’t C, Go, or Hare has them. Java, C#, JavaScript, Python, Ruby. You should take a look at all the functions available on iterators in Rust if you haven’t. The Rust community tends to prefer using iterators to express things like looping when possible, which is a more functional style.