Add dnd-character exercise

config.json

@@ -1112,6 +1112,16 @@
           "time"
         ]
       },
+      {
+        "slug": "dnd-character",
+        "name": "D&D Character",
+        "uuid": "d6a7a17f-dd95-46cd-93a8-6b536b2ff4e4",
+        "practices": [],
+        "prerequisites": [
+          "numbers"
+        ],
+        "difficulty": 4
+      },
       {
         "slug": "octal",
         "name": "Octal",

exercises/practice/dnd-character/.docs/instructions.md

@@ -0,0 +1,32 @@
+# 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

exercises/practice/dnd-character/.docs/introduction.md

@@ -0,0 +1,10 @@
+# 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

exercises/practice/dnd-character/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "erikschierboom"
+  ],
+  "files": {
+    "solution": [
+      "src/dnd_character.clj"
+    ],
+    "test": [
+      "test/dnd_character_test.clj"
+    ],
+    "example": [
+      ".meta/example.clj"
+    ]
+  },
+  "blurb": "Randomly generate Dungeons & Dragons characters.",
+  "source": "Simon Shine, Erik Schierboom",
+  "source_url": "https://github.com/exercism/problem-specifications/issues/616#issuecomment-437358945"
+}

exercises/practice/dnd-character/.meta/example.clj

@@ -0,0 +1,19 @@
+(ns dnd-character
+  (:require [clojure.math :refer [floor]]))
+
+(defn modifier [score]
+  (int (floor (/ (- score 10) 2))))
+
+(defn- die [] (inc (rand-int 6)))
+
+(defn ability []
+  (reduce + (rest (sort (repeatedly 4 die)))))
+
+(defrecord DndCharacter [strength dexterity charisma wisdom intelligence constitution hitpoints])
+
+(defn character []
+  (let [abilities (repeatedly 6 ability)
+        [strength dexterity charisma wisdom intelligence constitution] abilities
+        hitpoints (+ 10 (modifier constitution))]
+    (DndCharacter. strength dexterity charisma wisdom intelligence constitution hitpoints)))
+

exercises/practice/dnd-character/.meta/generator.clj

@@ -0,0 +1,16 @@
+(ns dnd-character-generator)
+
+(def random-abilities [:strength :dexterity :charisma :wisdom :intelligence :constitution])
+
+(defn- transform-character-test-case [test-case]
+  (map
+   (fn [ability]
+     (assoc (update test-case :path #(conj % (name ability))) :ability ability)) random-abilities))
+
+(defn- transform-test-case [test-case]
+  (if (= "character" (:property test-case))
+    (transform-character-test-case test-case)
+    [test-case]))
+
+(defn transform [test-cases]
+  (mapcat #(transform-test-case %) test-cases))

exercises/practice/dnd-character/.meta/generator.tpl

@@ -0,0 +1,29 @@
+(ns dnd-character-test
+  (:require [clojure.test :refer [deftest testing is]]
+            dnd-character))
+{{#test_cases.modifier}}
+(deftest modifier_test_{{idx}}
+  (testing {{string description}}
+    (is (= {{expected}} (dnd-character/modifier {{input.score}})))))
+{{/test_cases.modifier}}
+(deftest ability_test_1
+  (testing "random ability is within range"
+    (is (<= 3 (dnd-character/ability) 18))))
+
+(deftest ability_test_2
+  (testing "ability is generated randomly"
+    (is (>= (count (set (repeatedly 100 #(dnd-character/ability)))) 5))))
+{{#test_cases.character}}
+(deftest character_test_{{idx}}
+  (testing {{string description}}
+    (is (<= 3 (:{{ability}} (dnd-character/character)) 18))))
+{{/test_cases.character}}
+(deftest character_test_7
+  (testing "random character is valid - hitpoints"
+    (let [char (dnd-character/character)
+          expected (+ 10 (dnd-character/modifier (:constitution char)))]
+      (is (= expected (:hitpoints char))))))
+
+(deftest character_test_8
+  (testing "random character is generated randomly"
+    (is (>= (count (set (repeatedly 100 #(dnd-character/character)))) 5))))

exercises/practice/dnd-character/.meta/tests.toml

@@ -0,0 +1,73 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[1e9ae1dc-35bd-43ba-aa08-e4b94c20fa37]
+description = "ability modifier -> ability modifier for score 3 is -4"
+
+[cc9bb24e-56b8-4e9e-989d-a0d1a29ebb9c]
+description = "ability modifier -> ability modifier for score 4 is -3"
+
+[5b519fcd-6946-41ee-91fe-34b4f9808326]
+description = "ability modifier -> ability modifier for score 5 is -3"
+
+[dc2913bd-6d7a-402e-b1e2-6d568b1cbe21]
+description = "ability modifier -> ability modifier for score 6 is -2"
+
+[099440f5-0d66-4b1a-8a10-8f3a03cc499f]
+description = "ability modifier -> ability modifier for score 7 is -2"
+
+[cfda6e5c-3489-42f0-b22b-4acb47084df0]
+description = "ability modifier -> ability modifier for score 8 is -1"
+
+[c70f0507-fa7e-4228-8463-858bfbba1754]
+description = "ability modifier -> ability modifier for score 9 is -1"
+
+[6f4e6c88-1cd9-46a0-92b8-db4a99b372f7]
+description = "ability modifier -> ability modifier for score 10 is 0"
+
+[e00d9e5c-63c8-413f-879d-cd9be9697097]
+description = "ability modifier -> ability modifier for score 11 is 0"
+
+[eea06f3c-8de0-45e7-9d9d-b8cab4179715]
+description = "ability modifier -> ability modifier for score 12 is +1"
+
+[9c51f6be-db72-4af7-92ac-b293a02c0dcd]
+description = "ability modifier -> ability modifier for score 13 is +1"
+
+[94053a5d-53b6-4efc-b669-a8b5098f7762]
+description = "ability modifier -> ability modifier for score 14 is +2"
+
+[8c33e7ca-3f9f-4820-8ab3-65f2c9e2f0e2]
+description = "ability modifier -> ability modifier for score 15 is +2"
+
+[c3ec871e-1791-44d0-b3cc-77e5fb4cd33d]
+description = "ability modifier -> ability modifier for score 16 is +3"
+
+[3d053cee-2888-4616-b9fd-602a3b1efff4]
+description = "ability modifier -> ability modifier for score 17 is +3"
+
+[bafd997a-e852-4e56-9f65-14b60261faee]
+description = "ability modifier -> ability modifier for score 18 is +4"
+
+[4f28f19c-2e47-4453-a46a-c0d365259c14]
+description = "random ability is within range"
+
+[385d7e72-864f-4e88-8279-81a7d75b04ad]
+description = "random character is valid"
+
+[2ca77b9b-c099-46c3-a02c-0d0f68ffa0fe]
+description = "each ability is only calculated once"
+include = false
+
+[dca2b2ec-f729-4551-84b9-078876bb4808]
+description = "each ability is only calculated once"
+reimplements = "2ca77b9b-c099-46c3-a02c-0d0f68ffa0fe"
+include = false

exercises/practice/dnd-character/deps.edn

@@ -0,0 +1,6 @@
+{:aliases {:test {:extra-paths ["test"]
+                 :extra-deps {io.github.cognitect-labs/test-runner 
+                              {:git/url "https://github.com/cognitect-labs/test-runner.git"
+                               :sha "705ad25bbf0228b1c38d0244a36001c2987d7337"}}
+                 :main-opts ["-m" "cognitect.test-runner"]
+                 :exec-fn cognitect.test-runner.api/test}}}

exercises/practice/dnd-character/project.clj

@@ -0,0 +1,4 @@
+(defproject dnd-character "0.1.0-SNAPSHOT"
+  :description "dnd-character exercise."
+  :url "https://github.com/exercism/clojure/tree/main/exercises/practice/dnd-character"
+  :dependencies [[org.clojure/clojure "1.11.1"]])

exercises/practice/dnd-character/src/dnd_character.clj

@@ -0,0 +1,19 @@
+(ns dnd-character)
+
+(defn modifier
+  "Calculate a score's modifier"
+  [score]
+  ;; function body
+  )
+
+(defn ability
+  "Generate a random ability"
+  []
+  ;; function body
+  )
+
+(defn character
+  "Generate a random character"
+  []
+  ;; function body
+  )

exercises/practice/dnd-character/test/dnd_character_test.clj

@@ -0,0 +1,109 @@
+(ns dnd-character-test
+  (:require [clojure.test :refer [deftest testing is]]
+            dnd-character))
+
+(deftest modifier_test_1
+  (testing "ability modifier - ability modifier for score 3 is -4"
+    (is (= -4 (dnd-character/modifier 3)))))
+
+(deftest modifier_test_2
+  (testing "ability modifier - ability modifier for score 4 is -3"
+    (is (= -3 (dnd-character/modifier 4)))))
+
+(deftest modifier_test_3
+  (testing "ability modifier - ability modifier for score 5 is -3"
+    (is (= -3 (dnd-character/modifier 5)))))
+
+(deftest modifier_test_4
+  (testing "ability modifier - ability modifier for score 6 is -2"
+    (is (= -2 (dnd-character/modifier 6)))))
+
+(deftest modifier_test_5
+  (testing "ability modifier - ability modifier for score 7 is -2"
+    (is (= -2 (dnd-character/modifier 7)))))
+
+(deftest modifier_test_6
+  (testing "ability modifier - ability modifier for score 8 is -1"
+    (is (= -1 (dnd-character/modifier 8)))))
+
+(deftest modifier_test_7
+  (testing "ability modifier - ability modifier for score 9 is -1"
+    (is (= -1 (dnd-character/modifier 9)))))
+
+(deftest modifier_test_8
+  (testing "ability modifier - ability modifier for score 10 is 0"
+    (is (= 0 (dnd-character/modifier 10)))))
+
+(deftest modifier_test_9
+  (testing "ability modifier - ability modifier for score 11 is 0"
+    (is (= 0 (dnd-character/modifier 11)))))
+
+(deftest modifier_test_10
+  (testing "ability modifier - ability modifier for score 12 is +1"
+    (is (= 1 (dnd-character/modifier 12)))))
+
+(deftest modifier_test_11
+  (testing "ability modifier - ability modifier for score 13 is +1"
+    (is (= 1 (dnd-character/modifier 13)))))
+
+(deftest modifier_test_12
+  (testing "ability modifier - ability modifier for score 14 is +2"
+    (is (= 2 (dnd-character/modifier 14)))))
+
+(deftest modifier_test_13
+  (testing "ability modifier - ability modifier for score 15 is +2"
+    (is (= 2 (dnd-character/modifier 15)))))
+
+(deftest modifier_test_14
+  (testing "ability modifier - ability modifier for score 16 is +3"
+    (is (= 3 (dnd-character/modifier 16)))))
+
+(deftest modifier_test_15
+  (testing "ability modifier - ability modifier for score 17 is +3"
+    (is (= 3 (dnd-character/modifier 17)))))
+
+(deftest modifier_test_16
+  (testing "ability modifier - ability modifier for score 18 is +4"
+    (is (= 4 (dnd-character/modifier 18)))))
+
+(deftest ability_test_1
+  (testing "random ability is within range"
+    (is (<= 3 (dnd-character/ability) 18))))
+
+(deftest ability_test_2
+  (testing "ability is generated randomly"
+    (is (>= (count (set (repeatedly 100 #(dnd-character/ability)))) 5))))
+
+(deftest character_test_1
+  (testing "random character is valid - strength"
+    (is (<= 3 (:strength (dnd-character/character)) 18))))
+
+(deftest character_test_2
+  (testing "random character is valid - dexterity"
+    (is (<= 3 (:dexterity (dnd-character/character)) 18))))
+
+(deftest character_test_3
+  (testing "random character is valid - charisma"
+    (is (<= 3 (:charisma (dnd-character/character)) 18))))
+
+(deftest character_test_4
+  (testing "random character is valid - wisdom"
+    (is (<= 3 (:wisdom (dnd-character/character)) 18))))
+
+(deftest character_test_5
+  (testing "random character is valid - intelligence"
+    (is (<= 3 (:intelligence (dnd-character/character)) 18))))
+
+(deftest character_test_6
+  (testing "random character is valid - constitution"
+    (is (<= 3 (:constitution (dnd-character/character)) 18))))
+
+(deftest character_test_7
+  (testing "random character is valid - hitpoints"
+    (let [char (dnd-character/character)
+          expected (+ 10 (dnd-character/modifier (:constitution char)))]
+      (is (= expected (:hitpoints char))))))
+
+(deftest character_test_8
+  (testing "random character is generated randomly"
+    (is (>= (count (set (repeatedly 100 #(dnd-character/character)))) 5))))