allergies

elixir/allergies/.exercism/config.json

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+{
+  "authors": [
+    "rubysolo"
+  ],
+  "contributors": [
+    "andrewsardone",
+    "angelikatyborska",
+    "Cohen-Carlisle",
+    "dalexj",
+    "devonestes",
+    "ggpasqualino",
+    "jinyeow",
+    "lpil",
+    "martinsvalin",
+    "meadsteve",
+    "montague",
+    "neenjaw",
+    "parkerl",
+    "sotojuan",
+    "Teapane",
+    "waiting-for-dev"
+  ],
+  "files": {
+    "solution": [
+      "lib/allergies.ex"
+    ],
+    "test": [
+      "test/allergies_test.exs"
+    ],
+    "example": [
+      ".meta/example.ex"
+    ]
+  },
+  "blurb": "Given a person's allergy score, determine whether or not they're allergic to a given item, and their full list of allergies.",
+  "source": "Exercise by the JumpstartLab team for students at The Turing School of Software and Design.",
+  "source_url": "https://turing.edu"
+}

elixir/allergies/.exercism/metadata.json

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+{"track":"elixir","exercise":"allergies","id":"0f056a8c570349d4b0832bbf025c5c86","url":"https://exercism.org/tracks/elixir/exercises/allergies","handle":"negrienko","is_requester":true,"auto_approve":false}

elixir/allergies/.formatter.exs

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+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

elixir/allergies/.gitignore

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+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+allergies-*.tar
+

elixir/allergies/HELP.md

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+# Help
+
+## Running the tests
+
+From the terminal, change to the base directory of the exercise then execute the tests with:
+
+```bash
+$ mix test
+```
+
+This will execute the test file found in the `test` subfolder -- a file ending in `_test.exs`
+
+Documentation:
+
+* [`mix test` - Elixir's test execution tool](https://hexdocs.pm/mix/Mix.Tasks.Test.html)
+* [`ExUnit` - Elixir's unit test library](https://hexdocs.pm/ex_unit/ExUnit.html)
+
+## Pending tests
+
+In test suites of practice exercises, all but the first test have been tagged to be skipped.
+
+Once you get a test passing, you can unskip the next one by commenting out the relevant `@tag :pending` with a `#` symbol.
+
+For example:
+
+```elixir
+# @tag :pending
+test "shouting" do
+  assert Bob.hey("WATCH OUT!") == "Whoa, chill out!"
+end
+```
+
+If you wish to run all tests at once, you can include all skipped test by using the `--include` flag on the `mix test` command:
+
+```bash
+$ mix test --include pending
+```
+
+Or, you can enable all the tests by commenting out the `ExUnit.configure` line in the file `test/test_helper.exs`.
+
+```elixir
+# ExUnit.configure(exclude: :pending, trace: true)
+```
+
+## Useful `mix test` options
+
+* `test/<FILE>.exs:LINENUM` - runs only a single test, the test from `<FILE>.exs` whose definition is on line `LINENUM`
+* `--failed` - runs only tests that failed the last time they ran
+* `--max-failures` - the suite stops evaluating tests when this number of test failures
+is reached
+* `--seed 0` - disables randomization so the tests in a single file will always be ran
+in the same order they were defined in
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit lib/allergies.ex` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [Elixir track's documentation](https://exercism.org/docs/tracks/elixir)
+- The [Elixir track's programming category on the forum](https://forum.exercism.org/c/programming/elixir)
+- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+If you're stuck on something, it may help to look at some of the [available resources](https://exercism.org/docs/tracks/elixir/resources) out there where answers might be found.

elixir/allergies/README.md

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+# Allergies
+
+Welcome to Allergies on Exercism's Elixir Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Given a person's allergy score, determine whether or not they're allergic to a given item, and their full list of allergies.
+
+An allergy test produces a single numeric score which contains the information about all the allergies the person has (that they were tested for).
+
+The list of items (and their value) that were tested are:
+
+- eggs (1)
+- peanuts (2)
+- shellfish (4)
+- strawberries (8)
+- tomatoes (16)
+- chocolate (32)
+- pollen (64)
+- cats (128)
+
+So if Tom is allergic to peanuts and chocolate, he gets a score of 34.
+
+Now, given just that score of 34, your program should be able to say:
+
+- Whether Tom is allergic to any one of those allergens listed above.
+- All the allergens Tom is allergic to.
+
+Note: a given score may include allergens **not** listed above (i.e. allergens that score 256, 512, 1024, etc.).
+Your program should ignore those components of the score.
+For example, if the allergy score is 257, your program should only report the eggs (1) allergy.
+
+## Source
+
+### Created by
+
+- @rubysolo
+
+### Contributed to by
+
+- @andrewsardone
+- @angelikatyborska
+- @Cohen-Carlisle
+- @dalexj
+- @devonestes
+- @ggpasqualino
+- @jinyeow
+- @lpil
+- @martinsvalin
+- @meadsteve
+- @montague
+- @neenjaw
+- @parkerl
+- @sotojuan
+- @Teapane
+- @waiting-for-dev
+
+### Based on
+
+Exercise by the JumpstartLab team for students at The Turing School of Software and Design. - https://turing.edu

elixir/allergies/lib/allergies.ex

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+defmodule Allergies do
+  @allergens %{
+    "eggs" => 1,
+    "peanuts" => 2,
+    "shellfish" => 4,
+    "strawberries" => 8,
+    "tomatoes" => 16,
+    "chocolate" => 32,
+    "pollen" => 64,
+    "cats" => 128
+  }
+
+  @doc """
+  List the allergies for which the corresponding flag bit is true.
+  """
+  @spec list(non_neg_integer) :: [String.t()]
+  def list(flags) do
+    for {allergen, mask} <- @allergens, allergic_to?(mask, flags), do: allergen
+  end
+
+  @doc """
+  Returns whether the corresponding flag bit in 'flags' is set for the item.
+  """
+  @spec allergic_to?(non_neg_integer, String.t() | non_neg_integer) :: boolean
+  def allergic_to?(flags, mask) when is_integer(mask), do: Bitwise.band(mask, flags) > 0
+  def allergic_to?(flags, allergen) when is_binary(allergen), do: allergic_to?(@allergens[allergen], flags)
+end

elixir/allergies/mix.exs

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+defmodule Allergies.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :allergies,
+      version: "0.1.0",
+      # elixir: "~> 1.8",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
+    ]
+  end
+end

elixir/allergies/test/allergies_test.exs

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+defmodule AllergiesTest do
+  use ExUnit.Case
+
+  defp assert_is_a_set_containing(list, to_contain) do
+    set = Enum.into(list, MapSet.new())
+
+    same_contents =
+      to_contain
+      |> Enum.into(MapSet.new())
+      |> MapSet.equal?(set)
+
+    assert same_contents,
+           "Expected a set with: #{inspect(to_contain)} got #{inspect(set |> MapSet.to_list())}"
+  end
+
+  describe "allergy list against expected allergens -" do
+    test "no allergies at all" do
+      Allergies.list(0) |> assert_is_a_set_containing([])
+    end
+
+    test "allergic to just eggs" do
+      Allergies.list(1) |> assert_is_a_set_containing(~w[eggs])
+    end
+
+    test "allergic to just peanuts" do
+      Allergies.list(2) |> assert_is_a_set_containing(~w[peanuts])
+    end
+
+    test "allergic to just strawberries" do
+      Allergies.list(8) |> assert_is_a_set_containing(~w[strawberries])
+    end
+
+    test "allergic to eggs and peanuts" do
+      Allergies.list(3) |> assert_is_a_set_containing(~w[eggs peanuts])
+    end
+
+    test "allergic to more than eggs but not peanuts" do
+      Allergies.list(5) |> assert_is_a_set_containing(~w[eggs shellfish])
+    end
+
+    test "allergic to lots of stuff" do
+      Allergies.list(248)
+      |> assert_is_a_set_containing(~w[strawberries tomatoes chocolate pollen cats])
+    end
+
+    test "allergic to everything" do
+      Allergies.list(255)
+      |> assert_is_a_set_containing(
+        ~w[eggs peanuts shellfish strawberries tomatoes chocolate pollen cats]
+      )
+    end
+
+    test "ignore non allergen score parts" do
+      Allergies.list(509)
+      |> assert_is_a_set_containing(
+        ~w[eggs shellfish strawberries tomatoes chocolate pollen cats]
+      )
+    end
+
+    test "ignore non allergen score parts without highest valid score" do
+      Allergies.list(257)
+      |> assert_is_a_set_containing(~w[eggs])
+    end
+  end
+
+  describe "score for egg allergies -" do
+    test "not allergic to eggs" do
+      refute Allergies.allergic_to?(0, "eggs")
+    end
+
+    test "is allergic to only eggs" do
+      assert Allergies.allergic_to?(1, "eggs")
+    end
+
+    test "is allergic to eggs and something else" do
+      assert Allergies.allergic_to?(3, "eggs")
+    end
+
+    test "is allergic to something, but not eggs" do
+      refute Allergies.allergic_to?(2, "eggs")
+    end
+
+    test "is allergic to everything (including eggs)" do
+      assert Allergies.allergic_to?(255, "eggs")
+    end
+  end
+
+  describe "score for peanuts allergies -" do
+    test "not allergic to peanuts" do
+      refute Allergies.allergic_to?(0, "peanuts")
+    end
+
+    test "is allergic to only peanuts" do
+      assert Allergies.allergic_to?(2, "peanuts")
+    end
+
+    test "is allergic to peanuts and something else" do
+      assert Allergies.allergic_to?(7, "peanuts")
+    end
+
+    test "is allergic to something, but not peanuts" do
+      refute Allergies.allergic_to?(5, "peanuts")
+    end
+
+    test "is allergic to everything (including peanuts)" do
+      assert Allergies.allergic_to?(255, "peanuts")
+    end
+  end
+
+  describe "score for shellfish allergies -" do
+    test "not allergic to shellfish" do
+      refute Allergies.allergic_to?(0, "shellfish")
+    end
+
+    test "is allergic to only shellfish" do
+      assert Allergies.allergic_to?(4, "shellfish")
+    end
+
+    test "is allergic to shellfish and something else" do
+      assert Allergies.allergic_to?(14, "shellfish")
+    end
+
+    test "is allergic to something, but not shellfish" do
+      refute Allergies.allergic_to?(10, "shellfish")
+    end
+
+    test "is allergic to everything (including shellfish)" do
+      assert Allergies.allergic_to?(255, "shellfish")
+    end
+  end
+
+  describe "score for strawberries allergies -" do
+    test "not allergic to strawberries" do
+      refute Allergies.allergic_to?(0, "strawberries")
+    end
+
+    test "is allergic to only strawberries" do
+      assert Allergies.allergic_to?(8, "strawberries")
+    end
+
+    test "is allergic to strawberries and something else" do
+      assert Allergies.allergic_to?(28, "strawberries")
+    end
+
+    test "is allergic to something, but not strawberries" do
+      refute Allergies.allergic_to?(20, "strawberries")
+    end
+
+    test "is allergic to everything (including strawberries)" do
+      assert Allergies.allergic_to?(255, "strawberries")
+    end
+  end
+
+  describe "score for tomatoes allergies -" do
+    test "not allergic to tomatoes" do
+      refute Allergies.allergic_to?(0, "tomatoes")
+    end
+
+    test "is allergic to only tomatoes" do
+      assert Allergies.allergic_to?(16, "tomatoes")
+    end
+
+    test "is allergic to tomatoes and something else" do
+      assert Allergies.allergic_to?(56, "tomatoes")
+    end
+
+    test "is allergic to something, but not tomatoes" do
+      refute Allergies.allergic_to?(40, "tomatoes")
+    end
+
+    test "is allergic to everything (including tomatoes)" do
+      assert Allergies.allergic_to?(255, "tomatoes")
+    end
+  end
+
+  describe "score for chocolate allergies -" do
+    test "not allergic to chocolate" do
+      refute Allergies.allergic_to?(0, "chocolate")
+    end
+
+    test "is allergic to only chocolate" do
+      assert Allergies.allergic_to?(32, "chocolate")
+    end
+
+    test "is allergic to chocolate and something else" do
+      assert Allergies.allergic_to?(112, "chocolate")
+    end
+
+    test "is allergic to something, but not chocolate" do
+      refute Allergies.allergic_to?(80, "chocolate")
+    end
+
+    test "is allergic to everything (including chocolate)" do
+      assert Allergies.allergic_to?(255, "chocolate")
+    end
+  end
+
+  describe "score for pollen allergies -" do
+    test "not allergic to pollen" do
+      refute Allergies.allergic_to?(0, "pollen")
+    end
+
+    test "is allergic to only pollen" do
+      assert Allergies.allergic_to?(64, "pollen")
+    end
+
+    test "is allergic to pollen and something else" do
+      assert Allergies.allergic_to?(224, "pollen")
+    end
+
+    test "is allergic to something, but not pollen" do
+      refute Allergies.allergic_to?(160, "pollen")
+    end
+
+    test "is allergic to everything (including pollen)" do
+      assert Allergies.allergic_to?(255, "pollen")
+    end
+  end
+
+  describe "score for cats allergies -" do
+    test "not allergic to cats" do
+      refute Allergies.allergic_to?(0, "cats")
+    end
+
+    test "is allergic to only cats" do
+      assert Allergies.allergic_to?(128, "cats")
+    end
+
+    test "is allergic to cats and something else" do
+      assert Allergies.allergic_to?(192, "cats")
+    end
+
+    test "is allergic to something, but not cats" do
+      refute Allergies.allergic_to?(64, "cats")
+    end
+
+    test "is allergic to everything (including cats)" do
+      assert Allergies.allergic_to?(255, "cats")
+    end
+  end
+end

elixir/allergies/test/test_helper.exs

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+ExUnit.start()
+ExUnit.configure(exclude: :pending, trace: true)