defmodule Anagram do
  @spec anagram?(a :: String.t(), b :: String.t()) :: boolean
  def anagram?(a, b) do
    Map.equal?(to_symbols(a), to_symbols(b))
  end

  @spec to_symbols(a :: String.t()) :: map()
  defp to_symbols(a) do
    a
    |> String.downcase()
    |> String.graphemes()
    |> Enum.frequencies()
  end
end