Add darts

config.json

@@ -573,6 +573,14 @@
         "practices": [],
         "prerequisites": [],
         "difficulty": 3
+      },
+      {
+        "slug": "darts",
+        "name": "Darts",
+        "uuid": "c6b23754-4410-4450-81fc-a7d53278cff5",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
       }
     ]
   },

exercises/practice/darts/.docs/instructions.md

@@ -0,0 +1,31 @@
+# Instructions
+
+Calculate the points scored in a single toss of a Darts game.
+
+[Darts][darts] is a game where players throw darts at a [target][darts-target].
+
+In our particular instance of the game, the target rewards 4 different amounts of points, depending on where the dart lands:
+
+![Our dart scoreboard with values from a complete miss to a bullseye](https://assets.exercism.org/images/exercises/darts/darts-scoreboard.svg)
+
+- If the dart lands outside the target, player earns no points (0 points).
+- If the dart lands in the outer circle of the target, player earns 1 point.
+- If the dart lands in the middle circle of the target, player earns 5 points.
+- If the dart lands in the inner circle of the target, player earns 10 points.
+
+The outer circle has a radius of 10 units (this is equivalent to the total radius for the entire target), the middle circle a radius of 5 units, and the inner circle a radius of 1.
+Of course, they are all centered at the same point — that is, the circles are [concentric][] defined by the coordinates (0, 0).
+
+Given a point in the target (defined by its [Cartesian coordinates][cartesian-coordinates] `x` and `y`, where `x` and `y` are [real][real-numbers]), calculate the correct score earned by a dart landing at that point.
+
+## Credit
+
+The scoreboard image was created by [habere-et-dispertire][habere-et-dispertire] using [Inkscape][inkscape].
+
+[darts]: https://en.wikipedia.org/wiki/Darts
+[darts-target]: https://en.wikipedia.org/wiki/Darts#/media/File:Darts_in_a_dartboard.jpg
+[concentric]: https://mathworld.wolfram.com/ConcentricCircles.html
+[cartesian-coordinates]: https://www.mathsisfun.com/data/cartesian-coordinates.html
+[real-numbers]: https://www.mathsisfun.com/numbers/real-numbers.html
+[habere-et-dispertire]: https://exercism.org/profiles/habere-et-dispertire
+[inkscape]: https://en.wikipedia.org/wiki/Inkscape

exercises/practice/darts/.meta/config.json

@@ -0,0 +1,21 @@
+{
+  "authors": [
+    "BNAndras"
+  ],
+  "files": {
+    "solution": [
+      "darts.ml"
+    ],
+    "test": [
+      "test.ml"
+    ],
+    "example": [
+      ".meta/example.ml"
+    ],
+    "editor": [
+      "darts.mli"
+    ]
+  },
+  "blurb": "Calculate the points scored in a single toss of a Darts game.",
+  "source": "Inspired by an exercise created by a professor Della Paolera in Argentina"
+}

exercises/practice/darts/.meta/example.ml

@@ -0,0 +1,10 @@
+let score (x: float) (y: float): int =
+  let distance: float = sqrt((x ** 2.0) +. (y ** 2.0)) in
+  if distance <= 1.0 then
+    10
+  else if distance <= 5.0 then
+    5
+  else if distance <= 10.0 then
+    1
+  else
+    0

exercises/practice/darts/.meta/tests.toml

@@ -0,0 +1,49 @@
+# 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.
+
+[9033f731-0a3a-4d9c-b1c0-34a1c8362afb]
+description = "Missed target"
+
+[4c9f6ff4-c489-45fd-be8a-1fcb08b4d0ba]
+description = "On the outer circle"
+
+[14378687-ee58-4c9b-a323-b089d5274be8]
+description = "On the middle circle"
+
+[849e2e63-85bd-4fed-bc3b-781ae962e2c9]
+description = "On the inner circle"
+
+[1c5ffd9f-ea66-462f-9f06-a1303de5a226]
+description = "Exactly on center"
+
+[b65abce3-a679-4550-8115-4b74bda06088]
+description = "Near the center"
+
+[66c29c1d-44f5-40cf-9927-e09a1305b399]
+description = "Just within the inner circle"
+
+[d1012f63-c97c-4394-b944-7beb3d0b141a]
+description = "Just outside the inner circle"
+
+[ab2b5666-b0b4-49c3-9b27-205e790ed945]
+description = "Just within the middle circle"
+
+[70f1424e-d690-4860-8caf-9740a52c0161]
+description = "Just outside the middle circle"
+
+[a7dbf8db-419c-4712-8a7f-67602b69b293]
+description = "Just within the outer circle"
+
+[e0f39315-9f9a-4546-96e4-a9475b885aa7]
+description = "Just outside the outer circle"
+
+[045d7d18-d863-4229-818e-b50828c75d19]
+description = "Asymmetric position between the inner and middle circles"

exercises/practice/darts/Makefile

@@ -0,0 +1,9 @@
+default: clean test
+
+test: 
+	dune runtest
+
+clean:
+	dune clean
+
+.PHONY: clean

exercises/practice/darts/darts.ml

@@ -0,0 +1,2 @@
+let score (x: float) (y: float): int =
+  failwith "Please implement 'score'"

exercises/practice/darts/darts.mli

@@ -0,0 +1 @@
+val score : float -> float -> int

exercises/practice/darts/dune

@@ -0,0 +1,16 @@
+(executable
+ (name test)
+ (libraries base ounit2))
+
+(alias
+  (name    runtest)
+  (deps    (:x test.exe))
+  (action  (run %{x})))
+
+(alias
+  (name    buildtest)
+  (deps    (:x test.exe)))
+
+(env
+  (dev
+    (flags (:standard -warn-error -A))))

exercises/practice/darts/dune-project

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+(lang dune 1.1)

exercises/practice/darts/test.ml

@@ -0,0 +1,51 @@
+open Base
+open OUnit2
+open Darts
+
+let ae exp got _test_ctxt =
+  let printer = Int.to_string in
+  assert_equal exp got ~printer
+
+let tests = [
+  "Missed target" >::
+    ae 0 (score (-9.0) (9.0));
+
+  "On the outer circle" >::
+    ae 1 (score (0.0) (10.0));
+
+  "On the middle circle" >::
+    ae 5 (score (-5.0) (0.0));
+
+  "On the inner circle" >::
+    ae 10 (score (0.0) (-1.0));
+
+  "Exactly on center" >::
+    ae 10 (score (0.0) (0.0));
+
+  "Near the center" >::
+    ae 10 (score (-0.1) (-0.1));
+
+  "Just within the inner circle" >::
+    ae 10 (score (0.7) (0.7));
+
+  "Just outside the inner circle" >::
+    ae 5 (score (0.8) (-0.8));
+
+  "Just within the middle circle" >::
+    ae 5 (score (-3.5) (3.5));
+
+  "Just outside the middle circle" >::
+    ae 1 (score (-3.6) (-3.6));
+
+  "Just within the outer circle" >::
+    ae 1 (score (-7.0) (7.0));
+
+  "Just outside the outer circle" >::
+    ae 0 (score  (7.1) (-7.1));
+
+  "Asymmetric position between the inner and middle circles" >::
+    ae 5 (score (0.5) (-4.0));
+]
+
+let () =
+  run_test_tt_main ("darts tests" >::: tests)