Recursion and anonymous functions in elixir

Question

I\'m trying to define an anonymous function to do a dot product, I can code this as a private function without any problem but I am struggling with the anonymous function syntax

Answer 1

The less formal but still acceptable approach is:

factorial = fn
  (0,_) -> 1
  (1,_) -> 1
  (n, fun) -> n * fun.(n - 1, fun)
end

You call it with factorial.(6, factorial) # 720