I'd say it's not just learning multiple languages that is valuable, but learning languages with different paradigms. If you learn 5 different object-oriented la

I'd say it's not just learning multiple languages that is valuable, but learning languages with different paradigms. If you learn 5 different object-oriented languages, you'll mostly get exposed to different OOP concepts. If you learn an OOP language, a Procedural language, a Functional language, a declarative Logic language (Prolog, SQL, etc), and maybe something else you'll have a much broader set of ways to think about solving problems.