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

69 entries across 69 versions & 1 rubygems

Version	Path
trackler-2.2.1.159	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.158	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.157	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.156	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.155	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.154	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.153	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.152	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.151	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.150	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.149	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.148	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.147	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.146	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.145	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.144	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.143	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.142	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.141	tracks/elixir/exercises/roman-numerals/example.exs
trackler-2.2.1.140	tracks/elixir/exercises/roman-numerals/example.exs