fizzbuzz.exs

defmodule FizzBuzz do

  @doc """
  Given a range, returns an array of values conforming to the FizzBuzz pattern.
  
  ## Example
  FizzBuzz.calculate 1..15
  -> 1 2 Fizz 4 Buzz Fizz 7 8 Fizz Buzz 11 Fizz 13 14 FizzBuzz
  """
  def calculate(range) do
    Enum.map(range, &(FizzBuzz.calculate_value &1))
  end

  @doc """
  Calculate the FizzBuzz value for a single number
  """
  def calculate_value(value) when rem(value, 15) == 0, do: "FizzBuzz"
  def calculate_value(value) when rem(value, 3) == 0, do: "Fizz"
  def calculate_value(value) when rem(value, 5) == 0, do: "Buzz"
  def calculate_value(value), do: value

end