Contents

defmodule Binary do
  def to_decimal(string) do
    if !String.match?(string, ~r{[^10]}) do
      string |> bits |> Enum.reverse |> Enum.with_index |> sum
    else
      0
    end
  end

  defp bits(string), do: Enum.map(Regex.scan(~r{[10]}, string), &(&1 == ["1"]))

  defp sum(bits), do: Enum.reduce(bits, 0, fn(bit, acc) -> acc + power_of_two(bit) end)

  defp power_of_two({false, _}), do: 0
  defp power_of_two({true, exponent}), do: :math.pow(2, exponent)
end

Version data entries

327 entries across 327 versions & 1 rubygems

Version	Path
trackler-2.2.1.109	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.108	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.107	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.106	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.105	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.104	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.103	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.102	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.101	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.100	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.99	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.98	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.97	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.96	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.95	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.94	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.93	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.92	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.91	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.90	tracks/elixir/exercises/binary/example.exs