Add grade-school exercise

config.json

@@ -281,6 +281,18 @@
         ],
         "difficulty": 1
       },
+      {
+        "slug": "grade-school",
+        "name": "Grade School",
+        "uuid": "097edbd5-5c93-4d4f-a410-a38a5588f031",
+        "practices": [
+          "arrays",
+          "lists",
+          "sorting"
+        ],
+        "prerequisites": [],
+        "difficulty": 1
+      },
       {
         "slug": "grains",
         "name": "Grains",

exercises/practice/grade-school/.docs/instructions.md

@@ -0,0 +1,21 @@
+# Instructions
+
+Given students' names along with the grade that they are in, create a roster for the school.
+
+In the end, you should be able to:
+
+- Add a student's name to the roster for a grade
+  - "Add Jim to grade 2."
+  - "OK."
+- Get a list of all students enrolled in a grade
+  - "Which students are in grade 2?"
+  - "We've only got Jim just now."
+- Get a sorted list of all students in all grades.
+  Grades should sort as 1, 2, 3, etc., and students within a grade should be sorted alphabetically by name.
+  - "Who all is enrolled in school right now?"
+  - "Let me think.
+    We have Anna, Barb, and Charlie in grade 1, Alex, Peter, and Zoe in grade 2 and Jim in grade 5.
+    So the answer is: Anna, Barb, Charlie, Alex, Peter, Zoe and Jim"
+
+Note that all our students only have one name (It's a small town, what do you want?) and each student cannot be added more than once to a grade or the roster.
+In fact, when a test attempts to add the same student more than once, your implementation should indicate that this is incorrect.

exercises/practice/grade-school/.meta/Example.hx

@@ -0,0 +1,60 @@
+using Lambda;
+
+typedef Name    = String;
+typedef Grade   = Int;
+typedef Student = { name: Name, grade: Grade };
+
+class GradeSchool {
+    private final grades: Map<Grade, List<Name>> = [];
+
+    public function new() {
+    }
+
+    public function add(students: Array<Student>): Array<Bool> {
+        var results = [];
+        var roster = [];
+        for (student in students) {
+            if (roster.contains(student.name)) {
+                results.push(false);
+            } else {
+                if (!grades.exists(student.grade))
+                    grades[student.grade] = new List();
+
+                grades[student.grade].add(student.name);
+                results.push(true);
+
+                roster = this.roster();
+            }
+        }
+
+        return results;
+    }
+
+    public function roster(): Array<Name> {
+        var sortedKeys = [for (n in grades.keys()) n];
+        sortedKeys.sort(compareInt);
+
+        return [
+            for (key in sortedKeys) 
+            grade(key)
+        ].flatten();
+    }
+
+    public function grade(desiredGrade: Grade): Array<Name> {
+        if (!grades.exists(desiredGrade))
+            return [];
+
+        var grade = grades[desiredGrade].array();
+        grade.sort(compareString);
+
+        return grade;
+    }
+
+    private function compareInt(a: Int, b: Int): Int {
+        return a < b ? -1 : 1;
+    }
+
+    private function compareString(a: String, b: String): Int {
+        return a < b ? -1 : 1;
+    }
+}

exercises/practice/grade-school/.meta/config.json

@@ -0,0 +1,21 @@
+{
+  "authors": [
+    "mfoda"
+  ],
+  "contributors": [
+    "BNAndras"
+  ],
+  "files": {
+    "solution": [
+      "src/GradeSchool.hx"
+    ],
+    "test": [
+      "test/Test.hx"
+    ],
+    "example": [
+      ".meta/Example.hx"
+    ]
+  },
+  "blurb": "Given students' names along with the grade that they are in, create a roster for the school.",
+  "source": "A pairing session with Phil Battos at gSchool"
+}

exercises/practice/grade-school/.meta/tests.toml

@@ -0,0 +1,86 @@
+# 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.
+
+[a3f0fb58-f240-4723-8ddc-e644666b85cc]
+description = "Roster is empty when no student is added"
+
+[9337267f-7793-4b90-9b4a-8e3978408824]
+description = "Add a student"
+
+[6d0a30e4-1b4e-472e-8e20-c41702125667]
+description = "Student is added to the roster"
+
+[73c3ca75-0c16-40d7-82f5-ed8fe17a8e4a]
+description = "Adding multiple students in the same grade in the roster"
+
+[233be705-dd58-4968-889d-fb3c7954c9cc]
+description = "Multiple students in the same grade are added to the roster"
+
+[87c871c1-6bde-4413-9c44-73d59a259d83]
+description = "Cannot add student to same grade in the roster more than once"
+
+[c125dab7-2a53-492f-a99a-56ad511940d8]
+description = "A student can't be in two different grades"
+include = false
+
+[a0c7b9b8-0e89-47f8-8b4a-c50f885e79d1]
+description = "A student can only be added to the same grade in the roster once"
+include = false
+reimplements = "c125dab7-2a53-492f-a99a-56ad511940d8"
+
+[d7982c4f-1602-49f6-a651-620f2614243a]
+description = "Student not added to same grade in the roster more than once"
+reimplements = "a0c7b9b8-0e89-47f8-8b4a-c50f885e79d1"
+
+[e70d5d8f-43a9-41fd-94a4-1ea0fa338056]
+description = "Adding students in multiple grades"
+
+[75a51579-d1d7-407c-a2f8-2166e984e8ab]
+description = "Students in multiple grades are added to the roster"
+
+[7df542f1-57ce-433c-b249-ff77028ec479]
+description = "Cannot add same student to multiple grades in the roster"
+
+[6a03b61e-1211-4783-a3cc-fc7f773fba3f]
+description = "A student cannot be added to more than one grade in the sorted roster"
+include = false
+reimplements = "c125dab7-2a53-492f-a99a-56ad511940d8"
+
+[c7ec1c5e-9ab7-4d3b-be5c-29f2f7a237c5]
+description = "Student not added to multiple grades in the roster"
+reimplements = "6a03b61e-1211-4783-a3cc-fc7f773fba3f"
+
+[d9af4f19-1ba1-48e7-94d0-dabda4e5aba6]
+description = "Students are sorted by grades in the roster"
+
+[d9fb5bea-f5aa-4524-9d61-c158d8906807]
+description = "Students are sorted by name in the roster"
+
+[180a8ff9-5b94-43fc-9db1-d46b4a8c93b6]
+description = "Students are sorted by grades and then by name in the roster"
+
+[5e67aa3c-a3c6-4407-a183-d8fe59cd1630]
+description = "Grade is empty if no students in the roster"
+
+[1e0cf06b-26e0-4526-af2d-a2e2df6a51d6]
+description = "Grade is empty if no students in that grade"
+
+[2bfc697c-adf2-4b65-8d0f-c46e085f796e]
+description = "Student not added to same grade more than once"
+
+[66c8e141-68ab-4a04-a15a-c28bc07fe6b9]
+description = "Student not added to multiple grades"
+
+[c9c1fc2f-42e0-4d2c-b361-99271f03eda7]
+description = "Student not added to other grade for multiple grades"
+
+[1bfbcef1-e4a3-49e8-8d22-f6f9f386187e]
+description = "Students are sorted by name in a grade"

exercises/practice/grade-school/src/GradeSchool.hx

@@ -0,0 +1,23 @@
+package;
+
+typedef Name    = String;
+typedef Grade   = Int;
+typedef Student = { name: Name, grade: Grade };
+
+class GradeSchool {
+    public function new() {
+        throw "Not Implemented"; // Delete this statement and write your own implementation.
+    }
+
+    public function add(students: Array<Student>): Array<Bool> {
+        throw "Not Implemented"; // Delete this statement and write your own implementation.
+    }
+
+    public function roster(): Array<Name> {
+        throw "Not Implemented"; // Delete qthis statement and write your own implementation.
+    }
+
+    public function grade(desiredGrade: Grade): Array<String> {
+        throw "Not Implemented"; // Delete this statement and write your own implementation.
+    }
+}

exercises/practice/grade-school/test.hxml

@@ -0,0 +1,4 @@
+-x Test
+-lib buddy 
+-cp src/
+-cp test/