Contents

defmodule Allergies do
  import Bitwise

  @allergens [
    "eggs",
    "peanuts",
    "shellfish",
    "strawberries",
    "tomatoes",
    "chocolate",
    "pollen",
    "cats"
  ]

  def list(flags) do
    Enum.with_index(@allergens)
    |> Enum.filter_map(&(flagged? flags, &1), fn({item, _}) -> item end)
  end

  def allergic_to?(flags, item) do
    Enum.member?(list(flags), item)
  end

  defp flagged?(flags, {_, index}) do
    (flags &&& (1 <<< index)) > 0
  end
end

Version data entries

265 entries across 265 versions & 1 rubygems

Version	Path
trackler-2.2.1.47	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.46	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.45	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.44	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.43	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.42	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.41	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.40	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.39	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.38	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.37	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.36	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.35	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.34	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.33	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.32	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.31	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.30	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.29	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.28	tracks/elixir/exercises/allergies/example.exs