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

69 entries across 69 versions & 1 rubygems

Version	Path
trackler-2.2.1.180	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.179	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.178	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.177	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.176	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.175	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.174	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.173	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.172	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.171	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.170	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.169	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.167	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.166	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.165	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.164	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.163	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.162	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.161	tracks/elixir/exercises/binary/example.exs
trackler-2.2.1.160	tracks/elixir/exercises/binary/example.exs