I would guess that almost all functional programmers know OO programming, but very few OO programmers know functional programming. I think this is just because

I would guess that almost all functional programmers know OO programming, but very few OO programmers know functional programming. I think this is just because of pedagogic issues. Every introductory book/class introduces OO, but most undergraduate CS courses barely discuss functional programming (besides a semester on ML or Scheme, if you're particularly lucky). So, the people who go out off the beaten path to learn functional programming are a self selected subset that is particularly driven, curious, etc.