yacht (#56)

Author: glennj

config.json

@@ -430,6 +430,14 @@
         "practices": [],
         "prerequisites": [],
         "difficulty": 4
+      },
+      {
+        "slug": "yacht",
+        "name": "Yacht",
+        "uuid": "07d5ebc9-cd64-4f33-ba7e-e600192cfaa1",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 4
       }
     ]
   },

exercises/practice/yacht/.busted

@@ -0,0 +1,5 @@
+return {
+  default = {
+    ROOT = { '.' }
+  }
+}

exercises/practice/yacht/.docs/instructions.md

@@ -0,0 +1,30 @@
+# Instructions
+
+Given five dice and a category, calculate the score of the dice for that category.
+
+~~~~exercism/note
+You'll always be presented with five dice.
+Each dice's value will be between one and six inclusively.
+The dice may be unordered.
+~~~~
+
+## Scores in Yacht
+
+| Category        | Score                  | Description                              | Example             |
+| --------------- | ---------------------- | ---------------------------------------- | ------------------- |
+| Ones            | 1 × number of ones     | Any combination                          | 1 1 1 4 5 scores 3  |
+| Twos            | 2 × number of twos     | Any combination                          | 2 2 3 4 5 scores 4  |
+| Threes          | 3 × number of threes   | Any combination                          | 3 3 3 3 3 scores 15 |
+| Fours           | 4 × number of fours    | Any combination                          | 1 2 3 3 5 scores 0  |
+| Fives           | 5 × number of fives    | Any combination                          | 5 1 5 2 5 scores 15 |
+| Sixes           | 6 × number of sixes    | Any combination                          | 2 3 4 5 6 scores 6  |
+| Full House      | Total of the dice      | Three of one number and two of another   | 3 3 3 5 5 scores 19 |
+| Four of a Kind  | Total of the four dice | At least four dice showing the same face | 4 4 4 4 6 scores 16 |
+| Little Straight | 30 points              | 1-2-3-4-5                                | 1 2 3 4 5 scores 30 |
+| Big Straight    | 30 points              | 2-3-4-5-6                                | 2 3 4 5 6 scores 30 |
+| Choice          | Sum of the dice        | Any combination                          | 2 3 3 4 6 scores 18 |
+| Yacht           | 50 points              | All five dice showing the same face      | 4 4 4 4 4 scores 50 |
+
+If the dice do **not** satisfy the requirements of a category, the score is zero.
+If, for example, _Four Of A Kind_ is entered in the _Yacht_ category, zero points are scored.
+A _Yacht_ scores zero if entered in the _Full House_ category.

exercises/practice/yacht/.docs/introduction.md

@@ -0,0 +1,11 @@
+# Introduction
+
+Each year, something new is "all the rage" in your high school.
+This year it is a dice game: [Yacht][yacht].
+
+The game of Yacht is from the same family as Poker Dice, Generala and particularly Yahtzee, of which it is a precursor.
+The game consists of twelve rounds.
+In each, five dice are rolled and the player chooses one of twelve categories.
+The chosen category is then used to score the throw of the dice.
+
+[yacht]: https://en.wikipedia.org/wiki/Yacht_(dice_game)

exercises/practice/yacht/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "glennj"
+  ],
+  "files": {
+    "solution": [
+      "yacht.moon"
+    ],
+    "test": [
+      "yacht_spec.moon"
+    ],
+    "example": [
+      ".meta/example.moon"
+    ]
+  },
+  "blurb": "Score a single throw of dice in the game Yacht.",
+  "source": "James Kilfiger, using Wikipedia",
+  "source_url": "https://en.wikipedia.org/wiki/Yacht_(dice_game)"
+}

exercises/practice/yacht/.meta/example.moon

@@ -0,0 +1,69 @@
+import fold from require 'moon'
+
+local *
+
+score = (category, dice) ->
+  switch category
+    when 'ones'            then single 1, dice
+    when 'twos'            then single 2, dice
+    when 'threes'          then single 3, dice
+    when 'fours'           then single 4, dice
+    when 'fives'           then single 5, dice
+    when 'sixes'           then single 6, dice
+    when 'full house'      then full_house dice
+    when 'four of a kind'  then four_of_a_kind dice
+    when 'little straight' then straight dice, {1, 2, 3, 4, 5}
+    when 'big straight'    then straight dice, {2, 3, 4, 5, 6}
+    when 'yacht'           then yacht dice
+    when 'choice'          then sum dice
+
+
+single = (target, dice) ->
+  reduce 0, dice, (acc, die) -> acc + if die == target then die else 0
+
+
+full_house = (dice) ->
+  s = sorted dice
+  -- yacht is not a full house
+  return 0 if s[1] == s[5]
+
+  if (s[1] == s[2] and s[3] == s[5]) or (s[1] == s[3] and s[4] == s[5])
+    sum dice
+  else
+    0
+
+
+four_of_a_kind = (dice) ->
+  s = sorted dice
+  if s[1] == s[4] or s[2] == s[5]
+    4 * s[3]
+  else
+    0
+
+
+straight = (dice, target) ->
+  for i, die in ipairs sorted dice
+    return 0 if die != target[i]
+  30
+
+
+yacht = (dice) ->
+  s = sorted dice
+  if s[1] == s[5] then 50 else 0
+
+
+sum = (dice) ->
+  fold dice, (sum, die) -> sum + die
+
+
+sorted = (dice) ->
+  clone = {table.unpack dice}
+  table.sort clone
+  clone
+
+
+reduce = (init, list, f) ->
+  fold {init, table.unpack list}, f
+
+
+{ :score }

exercises/practice/yacht/.meta/spec_generator.moon

@@ -0,0 +1,9 @@
+{
+  module_name: 'Yacht',
+  generate_test: (case, level) ->
+    lines = {
+      "result = Yacht.score #{quote case.input.category}, {#{table.concat case.input.dice, ', '}}",
+      "assert.is.equal #{case.expected}, result"
+    }
+    table.concat [indent line, level for line in *lines], '\n'
+}

exercises/practice/yacht/.meta/tests.toml

@@ -0,0 +1,97 @@
+# 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.
+
+[3060e4a5-4063-4deb-a380-a630b43a84b6]
+description = "Yacht"
+
+[15026df2-f567-482f-b4d5-5297d57769d9]
+description = "Not Yacht"
+
+[36b6af0c-ca06-4666-97de-5d31213957a4]
+description = "Ones"
+
+[023a07c8-6c6e-44d0-bc17-efc5e1b8205a]
+description = "Ones, out of order"
+
+[7189afac-cccd-4a74-8182-1cb1f374e496]
+description = "No ones"
+
+[793c4292-dd14-49c4-9707-6d9c56cee725]
+description = "Twos"
+
+[dc41bceb-d0c5-4634-a734-c01b4233a0c6]
+description = "Fours"
+
+[f6125417-5c8a-4bca-bc5b-b4b76d0d28c8]
+description = "Yacht counted as threes"
+
+[464fc809-96ed-46e4-acb8-d44e302e9726]
+description = "Yacht of 3s counted as fives"
+
+[d054227f-3a71-4565-a684-5c7e621ec1e9]
+description = "Fives"
+
+[e8a036e0-9d21-443a-8b5f-e15a9e19a761]
+description = "Sixes"
+
+[51cb26db-6b24-49af-a9ff-12f53b252eea]
+description = "Full house two small, three big"
+
+[1822ca9d-f235-4447-b430-2e8cfc448f0c]
+description = "Full house three small, two big"
+
+[b208a3fc-db2e-4363-a936-9e9a71e69c07]
+description = "Two pair is not a full house"
+
+[b90209c3-5956-445b-8a0b-0ac8b906b1c2]
+description = "Four of a kind is not a full house"
+
+[32a3f4ee-9142-4edf-ba70-6c0f96eb4b0c]
+description = "Yacht is not a full house"
+
+[b286084d-0568-4460-844a-ba79d71d79c6]
+description = "Four of a Kind"
+
+[f25c0c90-5397-4732-9779-b1e9b5f612ca]
+description = "Yacht can be scored as Four of a Kind"
+
+[9f8ef4f0-72bb-401a-a871-cbad39c9cb08]
+description = "Full house is not Four of a Kind"
+
+[b4743c82-1eb8-4a65-98f7-33ad126905cd]
+description = "Little Straight"
+
+[7ac08422-41bf-459c-8187-a38a12d080bc]
+description = "Little Straight as Big Straight"
+
+[97bde8f7-9058-43ea-9de7-0bc3ed6d3002]
+description = "Four in order but not a little straight"
+
+[cef35ff9-9c5e-4fd2-ae95-6e4af5e95a99]
+description = "No pairs but not a little straight"
+
+[fd785ad2-c060-4e45-81c6-ea2bbb781b9d]
+description = "Minimum is 1, maximum is 5, but not a little straight"
+
+[35bd74a6-5cf6-431a-97a3-4f713663f467]
+description = "Big Straight"
+
+[87c67e1e-3e87-4f3a-a9b1-62927822b250]
+description = "Big Straight as little straight"
+
+[c1fa0a3a-40ba-4153-a42d-32bc34d2521e]
+description = "No pairs but not a big straight"
+
+[207e7300-5d10-43e5-afdd-213e3ac8827d]
+description = "Choice"
+
+[b524c0cf-32d2-4b40-8fb3-be3500f3f135]
+description = "Yacht as choice"

exercises/practice/yacht/yacht.moon

@@ -0,0 +1,4 @@
+{
+  score: (category, dice) ->
+    error 'Implement me'
+}

exercises/practice/yacht/yacht_spec.moon

@@ -0,0 +1,118 @@
+Yacht = require 'yacht'
+
+describe 'yacht', ->
+  it 'Yacht', ->
+    result = Yacht.score 'yacht', {5, 5, 5, 5, 5}
+    assert.is.equal 50, result
+
+  pending 'Not Yacht', ->
+    result = Yacht.score 'yacht', {1, 3, 3, 2, 5}
+    assert.is.equal 0, result
+
+  pending 'Ones', ->
+    result = Yacht.score 'ones', {1, 1, 1, 3, 5}
+    assert.is.equal 3, result
+
+  pending 'Ones, out of order', ->
+    result = Yacht.score 'ones', {3, 1, 1, 5, 1}
+    assert.is.equal 3, result
+
+  pending 'No ones', ->
+    result = Yacht.score 'ones', {4, 3, 6, 5, 5}
+    assert.is.equal 0, result
+
+  pending 'Twos', ->
+    result = Yacht.score 'twos', {2, 3, 4, 5, 6}
+    assert.is.equal 2, result
+
+  pending 'Fours', ->
+    result = Yacht.score 'fours', {1, 4, 1, 4, 1}
+    assert.is.equal 8, result
+
+  pending 'Yacht counted as threes', ->
+    result = Yacht.score 'threes', {3, 3, 3, 3, 3}
+    assert.is.equal 15, result
+
+  pending 'Yacht of 3s counted as fives', ->
+    result = Yacht.score 'fives', {3, 3, 3, 3, 3}
+    assert.is.equal 0, result
+
+  pending 'Fives', ->
+    result = Yacht.score 'fives', {1, 5, 3, 5, 3}
+    assert.is.equal 10, result
+
+  pending 'Sixes', ->
+    result = Yacht.score 'sixes', {2, 3, 4, 5, 6}
+    assert.is.equal 6, result
+
+  pending 'Full house two small, three big', ->
+    result = Yacht.score 'full house', {2, 2, 4, 4, 4}
+    assert.is.equal 16, result
+
+  pending 'Full house three small, two big', ->
+    result = Yacht.score 'full house', {5, 3, 3, 5, 3}
+    assert.is.equal 19, result
+
+  pending 'Two pair is not a full house', ->
+    result = Yacht.score 'full house', {2, 2, 4, 4, 5}
+    assert.is.equal 0, result
+
+  pending 'Four of a kind is not a full house', ->
+    result = Yacht.score 'full house', {1, 4, 4, 4, 4}
+    assert.is.equal 0, result
+
+  pending 'Yacht is not a full house', ->
+    result = Yacht.score 'full house', {2, 2, 2, 2, 2}
+    assert.is.equal 0, result
+
+  pending 'Four of a Kind', ->
+    result = Yacht.score 'four of a kind', {6, 6, 4, 6, 6}
+    assert.is.equal 24, result
+
+  pending 'Yacht can be scored as Four of a Kind', ->
+    result = Yacht.score 'four of a kind', {3, 3, 3, 3, 3}
+    assert.is.equal 12, result
+
+  pending 'Full house is not Four of a Kind', ->
+    result = Yacht.score 'four of a kind', {3, 3, 3, 5, 5}
+    assert.is.equal 0, result
+
+  pending 'Little Straight', ->
+    result = Yacht.score 'little straight', {3, 5, 4, 1, 2}
+    assert.is.equal 30, result
+
+  pending 'Little Straight as Big Straight', ->
+    result = Yacht.score 'big straight', {1, 2, 3, 4, 5}
+    assert.is.equal 0, result
+
+  pending 'Four in order but not a little straight', ->
+    result = Yacht.score 'little straight', {1, 1, 2, 3, 4}
+    assert.is.equal 0, result
+
+  pending 'No pairs but not a little straight', ->
+    result = Yacht.score 'little straight', {1, 2, 3, 4, 6}
+    assert.is.equal 0, result
+
+  pending 'Minimum is 1, maximum is 5, but not a little straight', ->
+    result = Yacht.score 'little straight', {1, 1, 3, 4, 5}
+    assert.is.equal 0, result
+
+  pending 'Big Straight', ->
+    result = Yacht.score 'big straight', {4, 6, 2, 5, 3}
+    assert.is.equal 30, result
+
+  pending 'Big Straight as little straight', ->
+    result = Yacht.score 'little straight', {6, 5, 4, 3, 2}
+    assert.is.equal 0, result
+
+  pending 'No pairs but not a big straight', ->
+    result = Yacht.score 'big straight', {6, 5, 4, 3, 1}
+    assert.is.equal 0, result
+
+  pending 'Choice', ->
+    result = Yacht.score 'choice', {3, 3, 5, 6, 6}
+    assert.is.equal 23, result
+
+  pending 'Yacht as choice', ->
+    result = Yacht.score 'choice', {2, 2, 2, 2, 2}
+    assert.is.equal 10, result