add ETL (#197)

Author: BNAndras

config.json

@@ -272,6 +272,14 @@
         "prerequisites": [],
         "difficulty": 2
       },
+      {
+        "slug": "etl",
+        "name": "ETL",
+        "uuid": "f3f3d1d9-5f1e-4bcf-8ae3-3f0de1019483",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
+      },
       {
         "slug": "isogram",
         "name": "Isogram",

exercises/practice/etl/.docs/instructions.md

@@ -0,0 +1,27 @@
+# Instructions
+
+Your task is to change the data format of letters and their point values in the game.
+
+Currently, letters are stored in groups based on their score, in a one-to-many mapping.
+
+- 1 point: "A", "E", "I", "O", "U", "L", "N", "R", "S", "T",
+- 2 points: "D", "G",
+- 3 points: "B", "C", "M", "P",
+- 4 points: "F", "H", "V", "W", "Y",
+- 5 points: "K",
+- 8 points: "J", "X",
+- 10 points: "Q", "Z",
+
+This needs to be changed to store each individual letter with its score in a one-to-one mapping.
+
+- "a" is worth 1 point.
+- "b" is worth 3 points.
+- "c" is worth 3 points.
+- "d" is worth 2 points.
+- etc.
+
+As part of this change, the team has also decided to change the letters to be lower-case rather than upper-case.
+
+~~~~exercism/note
+If you want to look at how the data was previously structured and how it needs to change, take a look at the examples in the test suite.
+~~~~

exercises/practice/etl/.docs/introduction.md

@@ -0,0 +1,16 @@
+# Introduction
+
+You work for a company that makes an online multiplayer game called Lexiconia.
+
+To play the game, each player is given 13 letters, which they must rearrange to create words.
+Different letters have different point values, since it's easier to create words with some letters than others.
+
+The game was originally launched in English, but it is very popular, and now the company wants to expand to other languages as well.
+
+Different languages need to support different point values for letters.
+The point values are determined by how often letters are used, compared to other letters in that language.
+
+For example, the letter 'C' is quite common in English, and is only worth 3 points.
+But in Norwegian it's a very rare letter, and is worth 10 points.
+
+To make it easier to add new languages, your team needs to change the way letters and their point values are stored in the game.

exercises/practice/etl/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "BNAndras"
+  ],
+  "files": {
+    "solution": [
+      "etl.wren"
+    ],
+    "test": [
+      "etl.spec.wren"
+    ],
+    "example": [
+      ".meta/proof.ci.wren"
+    ]
+  },
+  "blurb": "Change the data format for scoring a game to more easily add other languages.",
+  "source": "Based on an exercise by the JumpstartLab team for students at The Turing School of Software and Design.",
+  "source_url": "https://turing.edu"
+}

exercises/practice/etl/.meta/proof.ci.wren

@@ -0,0 +1,18 @@
+class Etl {
+  static toLowerUnsafe(str) {
+    return str.codePoints.map(Fn.new { |cp| String.fromCodePoint(cp + 32) }).join()
+  }
+
+  static transform(legacy) {
+    var results = {}
+    for (pair in legacy) {
+      for (letter in pair.value) {
+          var lowered = toLowerUnsafe(letter)
+          results[lowered] = pair.key
+        }
+      }
+
+    return results
+  }
+}
+

exercises/practice/etl/.meta/tests.toml

@@ -0,0 +1,22 @@
+# 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.
+
+[78a7a9f9-4490-4a47-8ee9-5a38bb47d28f]
+description = "single letter"
+
+[60dbd000-451d-44c7-bdbb-97c73ac1f497]
+description = "single score with multiple letters"
+
+[f5c5de0c-301f-4fdd-a0e5-df97d4214f54]
+description = "multiple scores with multiple letters"
+
+[5db8ea89-ecb4-4dcd-902f-2b418cc87b9d]
+description = "multiple scores with differing numbers of letters"

exercises/practice/etl/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 Exercism
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

exercises/practice/etl/etl.spec.wren

@@ -0,0 +1,46 @@
+import "./etl" for Etl
+import "wren-testie/testie" for Testie, Expect
+
+Testie.test("ETL") { |do, skip|
+  do.test("single letter") {
+    var legacy = { 1: ["A"] }
+    var actual = Etl.transform(legacy)
+    var expected = { "a": 1 }
+    Expect.value(actual).toEqual(expected)
+  }
+
+  skip.test("single score with multiple letters") {
+    var legacy = { 1: ["A", "E", "I", "O", "U"] }
+    var actual = Etl.transform(legacy)
+    var expected = { "a": 1, "e": 1, "i": 1, "o": 1, "u": 1 }
+    Expect.value(actual).toEqual(expected)
+  }
+
+  skip.test("multiple scores with multiple letters") {
+    var legacy = { 1: ["A", "E"], 2: ["D", "G"] }
+    var actual = Etl.transform(legacy)
+    var expected = { "a": 1, "d": 2, "e": 1, "g": 2 }
+    Expect.value(actual).toEqual(expected)
+  }
+
+  skip.test("multiple scores with differing numbers of letters") {
+    var legacy = {
+      1: ["A", "E", "I", "O", "U", "L", "N", "R", "S", "T"],
+      2: ["D", "G"],
+      3: ["B", "C", "M", "P"],
+      4: ["F", "H", "V", "W", "Y"],
+      5: ["K"],
+      8: ["J", "X"],
+      10: ["Q", "Z"]
+    }
+    var actual = Etl.transform(legacy)
+    var expected = {
+      "a": 1,   "b": 3, "c": 3, "d": 2, "e": 1, "f": 4, "g": 2, "h": 4,
+      "i": 1,   "j": 8, "k": 5, "l": 1, "m": 3, "n": 1, "o": 1, "p": 3,
+      "q": 10,  "r": 1, "s": 1, "t": 1, "u": 1, "v": 4, "w": 4, "x": 8,
+      "y": 4,   "z": 10
+    }
+    Expect.value(actual).toEqual(expected)
+  }
+}
+

exercises/practice/etl/etl.wren

@@ -0,0 +1,6 @@
+class Etl {
+  static transform(legacy) {
+    Fiber.abort("Remove this statement and implement this function")
+  }
+}
+

exercises/practice/etl/package.wren

@@ -0,0 +1,14 @@
+import "wren-package" for WrenPackage, Dependency
+import "os" for Process
+
+class Package is WrenPackage {
+  construct new() {}
+  name { "exercism/etl" }
+  dependencies {
+    return [
+      Dependency.new("wren-testie", "0.3.0", "https://github.com/joshgoebel/wren-testie.git")
+    ]
+  }
+}
+
+Package.new().default()