Contents

defmodule Hamming do
  @doc """
  Returns number of differences between two strands of Hamming, known as the Hamming Distance.

  ## Examples

  iex> Hamming.hamming_distance('AAGTCATA', 'TAGCGATC')
  {:ok, 4}
  """
  def hamming_distance(strand1, strand2) when length(strand1) === length(strand2) do
    distance = pairs(strand1, strand2) |> count_mismatched
    {:ok, distance}
  end

  def hamming_distance(_, _), do: {:error, "Lists must be the same length"}

  defp pairs(s1, s2), do: Enum.zip(s1, s2)
  defp count_mismatched(pairs), do: Enum.count(pairs, fn {c1, c2} -> c2 && c1 != c2 end)
end

Version data entries

69 entries across 69 versions & 1 rubygems

Version	Path
trackler-2.2.1.119	tracks/elixir/exercises/hamming/example.exs
trackler-2.2.1.118	tracks/elixir/exercises/hamming/example.exs
trackler-2.2.1.117	tracks/elixir/exercises/hamming/example.exs
trackler-2.2.1.116	tracks/elixir/exercises/hamming/example.exs
trackler-2.2.1.115	tracks/elixir/exercises/hamming/example.exs
trackler-2.2.1.114	tracks/elixir/exercises/hamming/example.exs
trackler-2.2.1.113	tracks/elixir/exercises/hamming/example.exs
trackler-2.2.1.111	tracks/elixir/exercises/hamming/example.exs
trackler-2.2.1.110	tracks/elixir/exercises/hamming/example.exs