Add Fizz Buzz implementation

README.md

@@ -1,6 +1,6 @@
 # FizzBadd
 
-**TODO: Add description**
+A shitty Fizz Buzz implementation generator.
 
 ## Installation
 

lib/fizz_badd.ex

@@ -2,17 +2,4 @@ defmodule FizzBadd do
   @moduledoc """
   Documentation for FizzBadd.
   """
-
-  @doc """
-  Hello world.
-
-  ## Examples
-
-      iex> FizzBadd.hello
-      :world
-
-  """
-  def hello do
-    :world
-  end
 end

lib/fizz_badd/fizz_buzz.ex

@@ -0,0 +1,28 @@
+defmodule FizzBadd.FizzBuzz do
+  @moduledoc """
+  Fizz Buzz implementation for internal use.
+  """
+
+  @doc """
+  Produce the n-th value in the Fizz Buzz sequence.
+
+  ## Examples
+
+      iex> FizzBadd.FizzBuzz.fizz_buzz(1)
+      "1"
+
+      iex> FizzBadd.FizzBuzz.fizz_buzz(3)
+      "Fizz"
+
+      iex> FizzBadd.FizzBuzz.fizz_buzz(5)
+      "Buzz"
+
+      iex> FizzBadd.FizzBuzz.fizz_buzz(15)
+      "Fizz Buzz"
+
+  """
+  def fizz_buzz(n) when rem(n, 15) == 0, do: "Fizz Buzz"
+  def fizz_buzz(n) when rem(n, 5) == 0, do: "Buzz"
+  def fizz_buzz(n) when rem(n, 3) == 0, do: "Fizz"
+  def fizz_buzz(n), do: Integer.to_string(n)
+end

test/fizz_badd/fizz_buzz_test.exs

@@ -0,0 +1,7 @@
+defmodule FizzBaddTest.FizzBuzzTest do
+  use ExUnit.Case
+
+  alias FizzBadd.FizzBuzz, as: FizzBuzz
+
+  doctest FizzBuzz
+end

test/fizz_badd_test.exs

@@ -1,8 +1,4 @@
 defmodule FizzBaddTest do
   use ExUnit.Case
   doctest FizzBadd
-
-  test "the truth" do
-    assert 1 + 1 == 2
-  end
 end