- What are you trying to achieve in learning functional programming ?
- Will you be using Scheme, F#, OCaml, Haskell or Elixir/Erlang or another language ?
In some ways there are 3 levels of functional programming: recursions (and higher order functions), continuations and Functors/Monads. Continuations seem to have fallen out of favor in the recent years.
90% of the time knowing recursion and HOF is sufficient. In fact, most Erlang/Elixir code have minimal recursion instead relying on map/reduce/filter to perform most of the work. You do not need much to start functional programming in Elixir. A shameless plug Functional Programming in Elixir
