Bottle song

.github/workflows/test.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   ci:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
       - name: Checkout repository

config.json

@@ -1282,6 +1282,14 @@
         "practices": [],
         "prerequisites": [],
         "difficulty": 3
+      },
+      {
+        "slug": "bottle-song",
+        "name": "Bottle Song",
+        "uuid": "0c786feb-8653-4215-9281-2e1c83afeefe",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 3
       }
     ]
   },

exercises/practice/bottle-song/.docs/instructions.md

@@ -0,0 +1,57 @@
+# Instructions
+
+Recite the lyrics to that popular children's repetitive song: Ten Green Bottles.
+
+Note that not all verses are identical.
+
+```text
+Ten green bottles hanging on the wall,
+Ten green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be nine green bottles hanging on the wall.
+
+Nine green bottles hanging on the wall,
+Nine green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be eight green bottles hanging on the wall.
+
+Eight green bottles hanging on the wall,
+Eight green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be seven green bottles hanging on the wall.
+
+Seven green bottles hanging on the wall,
+Seven green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be six green bottles hanging on the wall.
+
+Six green bottles hanging on the wall,
+Six green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be five green bottles hanging on the wall.
+
+Five green bottles hanging on the wall,
+Five green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be four green bottles hanging on the wall.
+
+Four green bottles hanging on the wall,
+Four green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be three green bottles hanging on the wall.
+
+Three green bottles hanging on the wall,
+Three green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be two green bottles hanging on the wall.
+
+Two green bottles hanging on the wall,
+Two green bottles hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be one green bottle hanging on the wall.
+
+One green bottle hanging on the wall,
+One green bottle hanging on the wall,
+And if one green bottle should accidentally fall,
+There'll be no green bottles hanging on the wall.
+```

exercises/practice/bottle-song/.meta/Example.scala

@@ -0,0 +1,17 @@
+object BottleSong:
+  private val numbers = List("no", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten")
+
+  private def suffix(bottles: Int) = if bottles == 1 then "" else "s"
+
+  private def hanging(bottles: Int) =
+    s"${numbers(bottles)} green bottle${suffix(bottles)} hanging on the wall"
+
+  private def firstLine(bottles: Int) = hanging(bottles) + ",\n"
+
+  private def lastLine(bottles: Int) = "There'll be " + hanging(bottles).toLowerCase + ".\n"
+
+  private def verse(bottles: Int) = firstLine(bottles).repeat(2) +
+    "And if one green bottle should accidentally fall,\n" + lastLine(bottles - 1)
+
+  def recite(startBottles: Int, takeDown: Int): String =
+    startBottles until startBottles - takeDown by -1 map verse mkString "\n"

exercises/practice/bottle-song/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "rabestro"
+  ],
+  "files": {
+    "solution": [
+      "src/main/scala/BottleSong.scala"
+    ],
+    "test": [
+      "src/test/scala/BottleSongTest.scala"
+    ],
+    "example": [
+      ".meta/Example.scala"
+    ]
+  },
+  "blurb": "Produce the lyrics to the popular children's repetitive song: Ten Green Bottles.",
+  "source": "Wikipedia",
+  "source_url": "https://en.wikipedia.org/wiki/Ten_Green_Bottles"
+}

exercises/practice/bottle-song/.meta/tests.toml

@@ -0,0 +1,31 @@
+# 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.
+
+[d4ccf8fc-01dc-48c0-a201-4fbeb30f2d03]
+description = "verse -> single verse -> first generic verse"
+
+[0f0aded3-472a-4c64-b842-18d4f1f5f030]
+description = "verse -> single verse -> last generic verse"
+
+[f61f3c97-131f-459e-b40a-7428f3ed99d9]
+description = "verse -> single verse -> verse with 2 bottles"
+
+[05eadba9-5dbd-401e-a7e8-d17cc9baa8e0]
+description = "verse -> single verse -> verse with 1 bottle"
+
+[a4a28170-83d6-4dc1-bd8b-319b6abb6a80]
+description = "lyrics -> multiple verses -> first two verses"
+
+[3185d438-c5ac-4ce6-bcd3-02c9ff1ed8db]
+description = "lyrics -> multiple verses -> last three verses"
+
+[28c1584a-0e51-4b65-9ae2-fbc0bf4bbb28]
+description = "lyrics -> multiple verses -> all verses"

exercises/practice/bottle-song/build.sbt

@@ -0,0 +1,3 @@
+scalaVersion := "3.4.2"
+
+libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.19" % Test

exercises/practice/bottle-song/project/build.properties

@@ -0,0 +1 @@
+sbt.version=1.10.1

exercises/practice/bottle-song/src/main/scala/BottleSong.scala

@@ -0,0 +1,3 @@
+object BottleSong:
+
+  def recite(startBottles: Int, takeDown: Int): String = ???

exercises/practice/bottle-song/src/test/scala/BottleSongTest.scala

@@ -0,0 +1,134 @@
+import org.scalatest.funsuite.AnyFunSuite
+import org.scalatest.matchers.should.Matchers
+
+class BottleSongTest extends AnyFunSuite with Matchers {
+
+  test("first generic verse") {
+    BottleSong.recite(10, 1) shouldBe
+      """Ten green bottles hanging on the wall,
+        |Ten green bottles hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be nine green bottles hanging on the wall.
+        |""".stripMargin.trim + "\n"
+  }
+
+  test("last generic verse") {
+    pending
+    BottleSong.recite(3, 1) shouldBe
+      """Three green bottles hanging on the wall,
+        |Three green bottles hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be two green bottles hanging on the wall.
+        |""".stripMargin.trim + "\n"
+  }
+
+  test("verse with two bottles") {
+    pending
+    BottleSong.recite(2, 1) shouldBe
+      """Two green bottles hanging on the wall,
+        |Two green bottles hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be one green bottle hanging on the wall.
+        |""".stripMargin.trim + "\n"
+  }
+
+  test("verse with one bottle") {
+    pending
+    BottleSong.recite(1, 1) shouldBe
+      """One green bottle hanging on the wall,
+        |One green bottle hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be no green bottles hanging on the wall.
+        |""".stripMargin.trim + "\n"
+  }
+
+  test("first two verses") {
+    pending
+    BottleSong.recite(10, 2) shouldBe
+      """Ten green bottles hanging on the wall,
+        |Ten green bottles hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be nine green bottles hanging on the wall.
+        |
+        |Nine green bottles hanging on the wall,
+        |Nine green bottles hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be eight green bottles hanging on the wall.
+        |""".stripMargin.trim + "\n"
+  }
+
+  test("last three verses") {
+    pending
+    BottleSong.recite(3, 3) shouldBe
+      """Three green bottles hanging on the wall,
+        |Three green bottles hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be two green bottles hanging on the wall.
+        |
+        |Two green bottles hanging on the wall,
+        |Two green bottles hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be one green bottle hanging on the wall.
+        |
+        |One green bottle hanging on the wall,
+        |One green bottle hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be no green bottles hanging on the wall.
+        |""".stripMargin.trim + "\n"
+  }
+
+  test("all verses") {
+    pending
+    BottleSong.recite(10, 10) shouldBe
+      """Ten green bottles hanging on the wall,
+        |Ten green bottles hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be nine green bottles hanging on the wall.
+        |
+        |Nine green bottles hanging on the wall,
+        |Nine green bottles hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be eight green bottles hanging on the wall.
+        |
+        |Eight green bottles hanging on the wall,
+        |Eight green bottles hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be seven green bottles hanging on the wall.
+        |
+        |Seven green bottles hanging on the wall,
+        |Seven green bottles hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be six green bottles hanging on the wall.
+        |
+        |Six green bottles hanging on the wall,
+        |Six green bottles hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be five green bottles hanging on the wall.
+        |
+        |Five green bottles hanging on the wall,
+        |Five green bottles hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be four green bottles hanging on the wall.
+        |
+        |Four green bottles hanging on the wall,
+        |Four green bottles hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be three green bottles hanging on the wall.
+        |
+        |Three green bottles hanging on the wall,
+        |Three green bottles hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be two green bottles hanging on the wall.
+        |
+        |Two green bottles hanging on the wall,
+        |Two green bottles hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be one green bottle hanging on the wall.
+        |
+        |One green bottle hanging on the wall,
+        |One green bottle hanging on the wall,
+        |And if one green bottle should accidentally fall,
+        |There'll be no green bottles hanging on the wall.
+        |""".stripMargin.trim + "\n"
+  }
+}