Erlang: Why does this fail with a 'badarith' exception?

Question

Is it possible to implement a closure in Erlang?

For example, how would I translate this snippet from Scheme?

(define (make-adder n)
  (lamdba (x) (+ x n)))

I've tried the following, but I'm clearly missing something.

make_adder(n) ->
    fun (x) -> x + n end.

Compiling this gives the error

Warning: this expression will fail with a 'badarith' exception

Answer 1

You can't add atoms. Variables start with Capital Letters in erlang. words starting with lower case letters are atoms.

In other words your problem is not related to funs at all, you just need to capitalize your variable names.

Answer 2

make_adder(N) ->
  fun (X) -> X + N end.