dnd-character

elixir/dnd-character/.exercism/config.json

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+{
+  "authors": [
+    "Br1ght0ne"
+  ],
+  "contributors": [
+    "angelikatyborska",
+    "Cohen-Carlisle",
+    "devonestes",
+    "neenjaw"
+  ],
+  "files": {
+    "solution": [
+      "lib/dnd_character.ex"
+    ],
+    "test": [
+      "test/dnd_character_test.exs"
+    ],
+    "example": [
+      ".meta/example.ex"
+    ]
+  },
+  "blurb": "Randomly generate Dungeons & Dragons characters.",
+  "source": "Simon Shine, Erik Schierboom",
+  "source_url": "https://github.com/exercism/problem-specifications/issues/616#issuecomment-437358945"
+}

elixir/dnd-character/.exercism/metadata.json

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+{"track":"elixir","exercise":"dnd-character","id":"68ec265ac1f144819dfb831fa55924b7","url":"https://exercism.org/tracks/elixir/exercises/dnd-character","handle":"negrienko","is_requester":true,"auto_approve":false}

elixir/dnd-character/.formatter.exs

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

elixir/dnd-character/.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").
+dnd_character-*.tar
+

elixir/dnd-character/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/dnd_character.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/dnd-character/README.md

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+# D&D Character
+
+Welcome to D&D Character on Exercism's Elixir Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Introduction
+
+After weeks of anticipation, you and your friends get together for your very first game of [Dungeons & Dragons][dnd] (D&D).
+Since this is the first session of the game, each player has to generate a character to play with.
+The character's abilities are determined by rolling 6-sided dice, but where _are_ the dice?
+With a shock, you realize that your friends are waiting for _you_ to produce the dice; after all it was your idea to play D&D!
+Panicking, you realize you forgot to bring the dice, which would mean no D&D game.
+As you have some basic coding skills, you quickly come up with a solution: you'll write a program to simulate dice rolls.
+
+[dnd]: https://en.wikipedia.org/wiki/Dungeons_%26_Dragons
+
+## Instructions
+
+For a game of [Dungeons & Dragons][dnd], each player starts by generating a character they can play with.
+This character has, among other things, six abilities; strength, dexterity, constitution, intelligence, wisdom and charisma.
+These six abilities have scores that are determined randomly.
+You do this by rolling four 6-sided dice and recording the sum of the largest three dice.
+You do this six times, once for each ability.
+
+Your character's initial hitpoints are 10 + your character's constitution modifier.
+You find your character's constitution modifier by subtracting 10 from your character's constitution, divide by 2 and round down.
+
+Write a random character generator that follows the above rules.
+
+For example, the six throws of four dice may look like:
+
+- 5, 3, 1, 6: You discard the 1 and sum 5 + 3 + 6 = 14, which you assign to strength.
+- 3, 2, 5, 3: You discard the 2 and sum 3 + 5 + 3 = 11, which you assign to dexterity.
+- 1, 1, 1, 1: You discard the 1 and sum 1 + 1 + 1 = 3, which you assign to constitution.
+- 2, 1, 6, 6: You discard the 1 and sum 2 + 6 + 6 = 14, which you assign to intelligence.
+- 3, 5, 3, 4: You discard the 3 and sum 5 + 3 + 4 = 12, which you assign to wisdom.
+- 6, 6, 6, 6: You discard the 6 and sum 6 + 6 + 6 = 18, which you assign to charisma.
+
+Because constitution is 3, the constitution modifier is -4 and the hitpoints are 6.
+
+~~~~exercism/note
+Most programming languages feature (pseudo-)random generators, but few programming languages are designed to roll dice.
+One such language is [Troll][troll].
+
+[troll]: https://di.ku.dk/Ansatte/?pure=da%2Fpublications%2Ftroll-a-language-for-specifying-dicerolls(84a45ff0-068b-11df-825d-000ea68e967b)%2Fexport.html
+~~~~
+
+[dnd]: https://en.wikipedia.org/wiki/Dungeons_%26_Dragons
+
+## Source
+
+### Created by
+
+- @Br1ght0ne
+
+### Contributed to by
+
+- @angelikatyborska
+- @Cohen-Carlisle
+- @devonestes
+- @neenjaw
+
+### Based on
+
+Simon Shine, Erik Schierboom - https://github.com/exercism/problem-specifications/issues/616#issuecomment-437358945

elixir/dnd-character/lib/dnd_character.ex

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+defmodule DndCharacter do
+  alias ElixirLS.LanguageServer.Providers.Completion.Reducers.Struct
+  @type t :: %__MODULE__{
+          strength: pos_integer(),
+          dexterity: pos_integer(),
+          constitution: pos_integer(),
+          intelligence: pos_integer(),
+          wisdom: pos_integer(),
+          charisma: pos_integer(),
+          hitpoints: pos_integer()
+        }
+
+  @abilities ~w(strength dexterity constitution intelligence wisdom charisma hitpoints)a
+
+  defstruct @abilities
+
+  @spec modifier(pos_integer()) :: integer()
+  def modifier(score), do: floor((score - 10) / 2)
+
+  @spec ability :: pos_integer()
+  def ability do
+    0..2
+    |> Enum.map(fn _x -> Enum.random(1..6) end)
+    |> Enum.sort(:desc)
+    |> Enum.sum()
+  end
+
+  @spec character :: t()
+  def character do
+    for ability <- @abilities, reduce: %{} do acc -> Map.put(acc, ability, ability()) end
+    |> then(&Map.put(&1, :hitpoints, 10 + modifier(Map.get(&1, :constitution))))
+    |> then(&struct(__MODULE__, &1))
+  end
+end

elixir/dnd-character/mix.exs

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+defmodule DndCharacter.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :dnd_character,
+      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/dnd-character/test/dnd_character_test.exs

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+defmodule DndCharacterTest do
+  use ExUnit.Case
+
+  import DndCharacter, only: [modifier: 1, ability: 0, character: 0]
+
+  describe "ability modifier" do
+    test "for score 3 is -4" do
+      assert modifier(3) === -4
+    end
+
+    test "for score 4 is -3" do
+      assert modifier(4) === -3
+    end
+
+    test "for score 5 is -3" do
+      assert modifier(5) === -3
+    end
+
+    test "for score 6 is -2" do
+      assert modifier(6) === -2
+    end
+
+    test "for score 7 is -2" do
+      assert modifier(7) === -2
+    end
+
+    test "for score 8 is -1" do
+      assert modifier(8) === -1
+    end
+
+    test "for score 9 is -1" do
+      assert modifier(9) === -1
+    end
+
+    test "for score 10 is 0" do
+      assert modifier(10) === 0
+    end
+
+    test "for score 11 is 0" do
+      assert modifier(11) === 0
+    end
+
+    test "for score 12 is +1" do
+      assert modifier(12) === 1
+    end
+
+    test "for score 13 is +1" do
+      assert modifier(13) === 1
+    end
+
+    test "for score 14 is +2" do
+      assert modifier(14) === 2
+    end
+
+    test "for score 15 is +2" do
+      assert modifier(15) === 2
+    end
+
+    test "for score 16 is +3" do
+      assert modifier(16) === 3
+    end
+
+    test "for score 17 is +3" do
+      assert modifier(17) === 3
+    end
+
+    test "for score 18 is +4" do
+      assert modifier(18) === 4
+    end
+  end
+
+  describe "random ability" do
+    test "is within range" do
+      Enum.each(1..200, fn _ -> assert ability() in 3..18 end)
+    end
+  end
+
+  describe "random character" do
+    test "has each ability within range and valid hitpoints" do
+      Enum.each(1..20, fn _ ->
+        character = character()
+
+        assert character.strength in 3..18
+        assert character.dexterity in 3..18
+        assert character.constitution in 3..18
+        assert character.intelligence in 3..18
+        assert character.wisdom in 3..18
+        assert character.charisma in 3..18
+        assert character.hitpoints === 10 + modifier(character.constitution)
+      end)
+    end
+  end
+end

elixir/dnd-character/test/test_helper.exs

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