# Implement and run a function sum(n) that uses recursion to calculate the sum of the integers from 1 to n. 
# You’ll need to write this function inside a module in a separate file. 
# Then load up IEx, compile that file, and try your function.

defmodule MyModule do
    
    def sum(1) do
        1
    end

    def sum(n) do
        n + sum(n - 1)
    end

end

IO.puts MyModule.sum(10)