Does Clojure support pattern matching? AFAIK, the only thing that is "functional" about Clojure is its immutable data structures (and closures, but even JS has those).
Well, 1930's functional programming. Those techniques developed into various type theories pretty quickly (at the time for foundational reasons, but also for comprehension/management/expressiveness reasons).
Or if you have a more strict reading, Lisp is implementation-driven FP in the 70s compared to theory-driven FP from the time.
Which language? C++? Java? Both now have closures. Closures aren't the indicator that a programming language is functional; I need something more - though I admit that I'm mostly used to static functional languages, I guess ADTs are not so useful in a dynamic language.
As with any programming paradigm, its not really useful to think of "functional" as a binary feature of programming languages, but rather an approach for which programming languages have varying degrees of support.
It has a support for destructuring, but no true pattern matching. Given the lack of algebraic data types, there's the question on what pattern matching would be supposed to match on.
