scrabble.ex

defmodule Scrabble do
  @letters %{
    "A" => 1, "B" => 3, "C" => 3, "D" => 2,
    "E" => 1, "F" => 4, "G" => 2, "H" => 4,
    "I" => 1, "J" => 8, "K" => 5, "L" => 1,
    "M" => 3, "N" => 1, "O" => 1, "P" => 3,
    "Q" => 10, "R" => 1, "S" => 1, "T" => 1,
    "U" => 1, "V" => 4, "W" => 4, "X" => 8,
    "Y" => 4, "Z" => 10
  }

  def score(nil), do: 0
  def score(""), do: 0

  def score(word) do
    word
    |> String.upcase
    |> String.split("")
    |> Enum.reject(&(&1 == ""))
    |> Enum.map(&(@letters[&1]))
    |> Enum.sum
  end
end