There's not really an official definition of FP. There are some proposed ones that involve types and some that don't involve them. Mainly though, this is a th

There's not really an official definition of FP. There are some proposed ones that involve types and some that don't involve them. Mainly though, this is a thread about the linked article, which is about the tribulations that the author had learning Haskell. Most of those tribulations were with the type system and I think that matches most people's experience. You can't transplant it to Lisp.