Add grade-school (#327)

Author: BNAndras

config.json

@@ -643,6 +643,14 @@
         "prerequisites": [],
         "difficulty": 2
       },
+      {
+        "slug": "grade-school",
+        "name": "Grade School",
+        "uuid": "98f925a2-bc1c-4dc1-b2f4-d06941114250",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 5
+      },
       {
         "slug": "minesweeper",
         "name": "Minesweeper",

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/config.json

@@ -0,0 +1,18 @@
+{
+  "authors": [
+    "BNAndras"
+  ],
+  "files": {
+    "solution": [
+      "grade-school.coffee"
+    ],
+    "test": [
+      "grade-school.spec.coffee"
+    ],
+    "example": [
+      ".meta/example.coffee"
+    ]
+  },
+  "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/example.coffee

@@ -0,0 +1,31 @@
+class GradeSchool
+  constructor: () ->
+    @students = {}
+
+  add: (student, level) ->
+    if @students[student]
+      false
+    else
+      @students[student] = level
+      true
+
+  grade: (level) ->
+    result = []
+    for student, grade of @students
+        if grade is level
+            result.push student
+    result.sort()
+
+  roster: () ->
+    result = []
+    grades = (g for _, g of @students).sort()
+    for g in grades.unique()
+      result.push (@grade g)...
+    result
+
+Array::unique = ->
+  output = {}
+  output[@[key]] = @[key] for key in [0...@length]
+  value for key, value of output
+
+module.exports = GradeSchool

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/grade-school.coffee

@@ -0,0 +1,10 @@
+class GradeSchool
+  constructor: () ->
+
+  add: (student, level) ->
+
+  grade: (level) ->
+
+  roster: () ->
+
+module.exports = GradeSchool

exercises/practice/grade-school/grade-school.spec.coffee

@@ -0,0 +1,121 @@
+GradeSchool = require './grade-school'
+
+describe 'Grade School', ->
+  school = {}
+  beforeEach ->
+    school = new GradeSchool
+
+  it 'Roster is empty when no student is added', ->
+    expect(school.roster()).toEqual []
+
+  xit 'Add a student', ->
+    expect(school.add 'Aimee', 2).toBe true
+
+  xit 'Student is added to the roster', ->
+    school.add 'Aimee', 2
+    expect(school.roster()).toEqual ['Aimee']
+
+  xit 'Adding multiple students in the same grade in the roster', ->
+    expect(school.add 'Blair', 2).toBe true
+    expect(school.add 'James', 2).toBe true
+    expect(school.add 'Paul', 2).toBe true
+  
+  xit 'Multiple students in the same grade are added to the roster', ->
+    school.add 'Blair', 2
+    school.add 'James', 2
+    school.add 'Paul', 2
+    expect(school.roster()).toEqual ['Blair', 'James', 'Paul']
+  
+  xit 'Cannot add student to same grade in the roster more than once', ->
+    school.add 'Blair', 2
+    expect(school.add 'James', 2).toBe true
+    expect(school.add 'James', 2).toBe false
+    school.add 'Paul', 2
+  
+  xit 'Student not added to same grade in the roster more than once', ->
+    school.add 'Blair', 2
+    school.add 'James', 2
+    school.add 'James', 2
+    school.add 'Paul', 2
+    expect(school.roster()).toEqual ['Blair', 'James', 'Paul']
+
+  xit 'Adding students in multiple grades', ->
+    expect(school.add 'Chelsea', 3).toBe true
+    expect(school.add 'Logan', 7).toBe true
+
+  xit 'Students in multiple grades are added to the roster', ->
+    school.add 'Chelsea', 3
+    school.add 'Logan', 7
+    expect(school.roster()).toEqual ['Chelsea', 'Logan']
+
+  xit 'Cannot add same student to multiple grades in the roster', ->
+    school.add 'Blair', 2
+    expect(school.add 'James', 2).toBe true
+    expect(school.add 'James', 3).toBe false
+    school.add 'Paul', 3
+
+  xit 'Student not added to multiple grades in the roster', ->
+    school.add 'Blair', 2
+    school.add 'James', 2
+    school.add 'James', 3
+    school.add 'Paul', 3
+    expect(school.roster()).toEqual ['Blair', 'James', 'Paul']
+
+  xit 'Students are sorted by grades in the roster', ->
+    school.add 'Jim', 3
+    school.add 'Peter', 2
+    school.add 'Anna', 1
+    expect(school.roster()).toEqual ['Anna', 'Peter', 'Jim']
+  
+  xit 'Students are sorted by name in the roster', ->
+    school.add 'Peter', 2
+    school.add 'Zoe', 2
+    school.add 'Alex', 2
+    expect(school.roster()).toEqual ['Alex', 'Peter', 'Zoe']
+  
+  xit 'Students are sorted by grades and then by name in the roster', ->
+    school.add 'Peter', 2
+    school.add 'Anna', 1
+    school.add 'Barb', 1
+    school.add 'Zoe', 2
+    school.add 'Alex', 2
+    school.add 'Jim', 3
+    school.add 'Charlie', 1
+    expect(school.roster()).toEqual ['Anna', 'Barb', 'Charlie', 'Alex', 'Peter', 'Zoe', 'Jim']
+
+  xit 'Grade is empty if no students in the roster', ->
+    expect(school.grade 1).toEqual []
+
+  xit 'Grade is empty if no students in that grade', ->
+    school.add 'Peter', 2
+    school.add 'Zoe', 2
+    school.add 'Alex', 2
+    school.add 'Jim', 3
+    expect(school.grade 1).toEqual []
+
+  xit 'Student not added to same grade more than once', ->
+    school.add 'Blair', 2
+    school.add 'James', 2
+    school.add 'James', 2
+    school.add 'Paul', 2
+    expect(school.grade 2).toEqual ['Blair', 'James', 'Paul']
+
+  xit 'Student not added to multiple grades', ->
+    school.add 'Blair', 2
+    school.add 'James', 2
+    school.add 'James', 3
+    school.add 'Paul', 3
+    expect(school.grade 2).toEqual ['Blair', 'James']
+
+  xit 'Student not added to other grade for multiple grades', ->
+    school.add 'Blair', 2
+    school.add 'James', 2
+    school.add 'James', 3
+    school.add 'Paul', 3
+    expect(school.grade 3).toEqual ['Paul']
+
+  xit 'Students are sorted by name in a grade', ->  
+    school.add 'Franklin', 5
+    school.add 'Bradley', 5
+    school.add 'Jeff', 1
+    expect(school.grade 5).toEqual ['Bradley', 'Franklin']