[etl] Add new practice exercise

config.json

@@ -266,6 +266,14 @@
         "practices": [],
         "prerequisites": [],
         "difficulty": 2
+      },
+      {
+        "slug": "etl",
+        "name": "ETL",
+        "uuid": "47c88b96-c87f-4980-8ab4-ad14f45c36a7",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
       }
     ]
   },

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": [
+    "IsaacG"
+  ],
+  "files": {
+    "solution": [
+      "etl.gd"
+    ],
+    "test": [
+      "etl_test.gd"
+    ],
+    "example": [
+      ".meta/example.gd"
+    ]
+  },
+  "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://www.turing.edu/"
+}

exercises/practice/etl/.meta/example.gd

@@ -0,0 +1,6 @@
+func transform(legacy: Dictionary) -> Dictionary:
+	var out: Dictionary[String, int] = {}
+	for score in legacy.keys():
+		for letter in legacy[score]:
+			out[letter.to_lower()] = score
+	return out

exercises/practice/etl/.meta/template.j2

@@ -0,0 +1,11 @@
+{% for case in cases %}
+func test_{{ case.func_name }}(solution_script):
+	var inputs = { {%- for key, val in case.given.items() %}
+		{{ key }}: {{ val | togdscript }},{% endfor %}
+	}
+	var expected = { {%- for key, val in case.expected.items() %}
+		{{ key | togdscript }}: {{ val | togdscript }},{% endfor %}
+	}
+	return [solution_script.{{ case.property | camel_to_snake }}(inputs), expected]
+
+{% endfor %}

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/etl.gd

@@ -0,0 +1,2 @@
+func transform(legacy: Dictionary) -> Dictionary:
+	pass

exercises/practice/etl/etl_test.gd

@@ -0,0 +1,77 @@
+func test_single_letter(solution_script):
+	var inputs = {
+		1: ["A"],
+	}
+	var expected = {
+		"a": 1,
+	}
+	return [solution_script.transform(inputs), expected]
+
+
+func test_single_score_with_multiple_letters(solution_script):
+	var inputs = {
+		1: ["A", "E", "I", "O", "U"],
+	}
+	var expected = {
+		"a": 1,
+		"e": 1,
+		"i": 1,
+		"o": 1,
+		"u": 1,
+	}
+	return [solution_script.transform(inputs), expected]
+
+
+func test_multiple_scores_with_multiple_letters(solution_script):
+	var inputs = {
+		1: ["A", "E"],
+		2: ["D", "G"],
+	}
+	var expected = {
+		"a": 1,
+		"d": 2,
+		"e": 1,
+		"g": 2,
+	}
+	return [solution_script.transform(inputs), expected]
+
+
+func test_multiple_scores_with_differing_numbers_of_letters(solution_script):
+	var inputs = {
+		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 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,
+	}
+	return [solution_script.transform(inputs), expected]