Add darts exercise (#30)

Author: BNAndras

config.json

@@ -74,6 +74,14 @@
         "practices": [],
         "prerequisites": [],
         "difficulty": 2
+      },
+      {
+        "slug": "darts",
+        "name": "Darts",
+        "uuid": "0646b090-41a2-428d-b092-1ffbba71b316",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
       }
     ]
   },

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

@@ -0,0 +1,31 @@
+# Instructions
+
+Write a function that returns the earned points 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).
+
+Write a function that given a point in the target (defined by its [Cartesian coordinates][cartesian-coordinates] `x` and `y`, where `x` and `y` are [real][real-numbers]), returns the correct amount 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 +1,18 @@
+{
+  "authors": [
+    "BNAndras"
+  ],
+  "files": {
+    "solution": [
+      "darts.gd"
+    ],
+    "test": [
+      "darts_test.gd"
+    ],
+    "example": [
+      ".meta/example.gd"
+    ]
+  },
+  "blurb": "Write a function that returns the earned points 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.gd

@@ -0,0 +1,9 @@
+func score(x, y):
+	var distance = sqrt(pow(x, 2) + pow(y, 2))
+	if distance <= 1:
+		return 10
+	if distance <= 5:
+		return 5
+	if distance <= 10:
+		return 1
+	return 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/darts.gd

@@ -0,0 +1,2 @@
+func score(x, y):
+	pass

exercises/practice/darts/darts_test.gd

@@ -0,0 +1,89 @@
+func test_missed_target(solution_script):
+	var x = -9
+	var y = 9
+	var expected = 0
+	return [expected, solution_script.score(x, y)]
+
+
+func test_on_the_outer_circle(solution_script):
+	var x = 0
+	var y = 10
+	var expected = 1
+	return [expected, solution_script.score(x, y)]
+
+
+func test_on_the_middle_circle(solution_script):
+	var x = -5
+	var y = 0
+	var expected = 5
+	return [expected, solution_script.score(x, y)]
+
+
+func test_on_the_inner_circle(solution_script):
+	var x = 0
+	var y = -1
+	var expected = 10
+	return [expected, solution_script.score(x, y)]
+
+
+func test_exactly_on_center(solution_script):
+	var x = 0
+	var y = 0
+	var expected = 10
+	return [expected, solution_script.score(x, y)]
+
+
+func test_near_the_center(solution_script):
+	var x = -0.1
+	var y = -0.1
+	var expected = 10
+	return [expected, solution_script.score(x, y)]
+
+
+func test_just_within_the_inner_circle(solution_script):
+	var x = 0.7
+	var y = 0.7
+	var expected = 10
+	return [expected, solution_script.score(x, y)]
+
+
+func test_just_outside_the_inner_circle(solution_script):
+	var x = 0.8
+	var y = -0.8
+	var expected = 5
+	return [expected, solution_script.score(x, y)]
+
+
+func test_just_within_the_middle_circle(solution_script):
+	var x = -3.5
+	var y = 3.5
+	var expected = 5
+	return [expected, solution_script.score(x, y)]
+
+
+func test_just_outside_the_middle_circle(solution_script):
+	var x = -3.6
+	var y = -3.6
+	var expected = 1
+	return [expected, solution_script.score(x, y)]
+
+
+func test_just_within_the_outer_circle(solution_script):
+	var x = -7.0
+	var y = 7.0
+	var expected = 1
+	return [expected, solution_script.score(x, y)]
+
+
+func test_just_outside_the_outer_circle(solution_script):
+	var x = 7.1
+	var y = -7.1
+	var expected = 0
+	return [expected, solution_script.score(x, y)]
+
+
+func test_asymmetric_position(solution_script):
+	var x = 0.5
+	var y = -4
+	var expected = 5
+	return [expected, solution_script.score(x, y)]