Has your career taken you across many different programming paradigms? A C programmer with no experience in concatenative or, especially, functional languages

Has your career taken you across many different programming paradigms? A C programmer with no experience in concatenative or, especially, functional languages will have little chance of understanding code written in Forth or Haskell. They will have to start at the bottom of the learning curve. The differences between languages aren't just skin-deep. Same goes for the design patterns in those languages. Haskell's applicatives have no analog in C, for instance.