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-2.2.1.78	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.77	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.76	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.75	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.74	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.73	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.72	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.71	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.70	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.69	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.68	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.67	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.66	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.65	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.64	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.63	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.62	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.61	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.60	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.59	tracks/elixir/exercises/allergies/example.exs