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(&flagged?(flags, &1))
    |> Enum.map(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

131 entries across 131 versions & 1 rubygems

Version	Path
trackler-2.2.1.139	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.138	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.137	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.136	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.135	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.134	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.133	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.132	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.131	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.130	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.129	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.128	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.127	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.126	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.125	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.124	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.123	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.122	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.121	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.120	tracks/elixir/exercises/allergies/example.exs