Yes, functional composition in part. And while pretty-much-everyone has first-class functions now, they're usually not _quite_ as easy to declare and use as the

Yes, functional composition in part. And while pretty-much-everyone has first-class functions now, they're usually not _quite_ as easy to declare and use as they are in F# (e.g., if you have to specify `Func<string, Func<string, int>> Foo` rather than `let Foo s1 s2 = ... ` Another data-wrangling thing easier in F# (not FP in general) is type-providers.