FizzBuzz in Elixir (one of the many ways to do it). From the PragProg book.

fizzbuzz.exs

defmodule FizzBuzz do
  def upto(n) when n > 0, do: 1..n |> Enum.map(&fizzbuzz/1)

  defp fizzbuzz(n) when rem(n,3) == 0 and rem(n,5) == 0, do: "FizzBuzz"
  defp fizzbuzz(n) when rem(n,3) == 0, do: "Fizz"
  defp fizzbuzz(n) when rem(n,5) == 0, do: "Buzz"
  defp fizzbuzz(n), do: n
end

FizzBuzz.upto(100) |> Enum.join(" ") |> IO.puts