Contents

defmodule Roman do
  @numerals [
    [1000, "M"],
    [ 900, "CM"],
    [ 500, "D"],
    [ 400, "CD"],
    [ 100, "C"],
    [  90, "XC"],
    [  50, "L"],
    [  40, "XL"],
    [  10, "X"],
    [   9, "IX"],
    [   5, "V"],
    [   4, "IV"],
    [   1, "I"]
  ]

  def numerals(0), do: ""
  def numerals(number) do
    [part, letter] = largest_factor(number)
    letter <> numerals(number - part)
  end

  defp largest_factor(number) do
    hd Enum.filter(@numerals, fn([p, _]) -> p <= number end)
  end
end

Version data entries

327 entries across 327 versions & 1 rubygems

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