I think the most apparent example is that people recognize patterns like `fold` and `map` everywhere once they've seen functional programming. This can be impl

I think the most apparent example is that people recognize patterns like `fold` and `map` everywhere once they've seen functional programming. This can be implemented in any language I guess. Most often you'll see explicit & imperative loops being refactored to shorter, descriptive code with anonymous functions, folds, filters and maps