Add grade-school exercise (#127)

config.json

@@ -585,6 +585,17 @@
         ],
         "difficulty": 2
       },
+      {
+        "slug": "grade-school",
+        "name": "Grade School",
+        "uuid": "f9b0bc81-ea0b-4007-8228-6bb520333289",
+        "practices": [],
+        "prerequisites": [
+          "numbers",
+          "strings"
+        ],
+        "difficulty": 3
+      },
       {
         "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/config.json

@@ -0,0 +1,18 @@
+{
+  "authors": [
+    "ErikSchierboom"
+  ],
+  "files": {
+    "solution": [
+      "src/grade_school.cljs"
+    ],
+    "test": [
+      "test/grade_school_test.cljs"
+    ],
+    "example": [
+      ".meta/src/example.cljs"
+    ]
+  },
+  "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/src/example.cljs

@@ -0,0 +1,19 @@
+(ns grade-school)
+
+(defn grade
+  "show the roster for a specific grade"
+  [db grade-level]
+  (db grade-level []))
+
+(defn add
+  "add student to roster for grade"
+  [db student grade-level]
+  (let [roster (grade db grade-level)]
+    (assoc db grade-level (conj roster student))))
+
+(defn sorted
+  "show the sorted roster for each grade"
+  [db]
+  (into (sorted-map)
+        (for [[grade-level roster] db]
+          [grade-level (sort roster)])))

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

@@ -0,0 +1,24 @@
+# This is an auto-generated file. Regular comments will be removed when this
+# file is regenerated. Regenerating will not touch any manually added keys,
+# so comments can be added in a "comment" key.
+
+[6d0a30e4-1b4e-472e-8e20-c41702125667]
+description = "Adding a student adds them to the sorted roster"
+
+[233be705-dd58-4968-889d-fb3c7954c9cc]
+description = "Adding more student adds them to the sorted roster"
+
+[75a51579-d1d7-407c-a2f8-2166e984e8ab]
+description = "Adding students to different grades adds them to the same sorted roster"
+
+[a3f0fb58-f240-4723-8ddc-e644666b85cc]
+description = "Roster returns an empty list if there are no students enrolled"
+
+[180a8ff9-5b94-43fc-9db1-d46b4a8c93b6]
+description = "Student names with grades are displayed in the same sorted roster"
+
+[1bfbcef1-e4a3-49e8-8d22-f6f9f386187e]
+description = "Grade returns the students in that grade in alphabetical order"
+
+[5e67aa3c-a3c6-4407-a183-d8fe59cd1630]
+description = "Grade returns an empty list if there are no students in that grade"

exercises/practice/grade-school/deps.edn

@@ -0,0 +1,10 @@
+{:deps
+ {org.clojure/clojure {:mvn/version "1.10.1"}
+  org.clojure/clojurescript {:mvn/version "1.10.773"}}
+
+ :aliases
+ {:test
+  {:extra-paths ["test"]
+   :extra-deps
+   {olical/cljs-test-runner {:mvn/version "3.8.0"}}
+   :main-opts ["-m" "cljs-test-runner.main"]}}}

exercises/practice/grade-school/src/grade_school.cljs

@@ -0,0 +1,13 @@
+(ns grade-school)
+
+(defn grade [school grade]  ;; <- arglist goes here
+    ;; your code goes here
+)
+
+(defn add [school name grade]  ;; <- arglist goes here
+    ;; your code goes here
+)
+
+(defn sorted [school]  ;; <- arglist goes here
+    ;; your code goes here
+)

exercises/practice/grade-school/test/grade_school_test.cljs

@@ -0,0 +1,53 @@
+(ns grade-school-test
+  (:require [clojure.test :refer [deftest is]]
+            grade-school))
+
+(def db {})
+
+(deftest add-student
+  (is (= {2 ["Aimee"]} (grade-school/add db "Aimee" 2))))
+
+(deftest add-more-students-in-same-class
+  (is (= {2 ["James", "Blair", "Paul"]}
+         (-> db
+             (grade-school/add "James" 2)
+             (grade-school/add "Blair" 2)
+             (grade-school/add "Paul" 2)))))
+
+(deftest add-students-to-different-grades
+  (is (= {3 ["Chelsea"] 7 ["Logan"]}
+         (-> db
+             (grade-school/add "Chelsea" 3)
+             (grade-school/add "Logan" 7)))))
+
+(deftest get-students-in-a-grade
+  (is (= ["Franklin", "Bradley"]
+         (-> db
+             (grade-school/add "Franklin" 5)
+             (grade-school/add "Bradley" 5)
+             (grade-school/add "Jeff" 1)
+             (grade-school/grade 5)))))
+
+(deftest get-students-in-a-non-existent-grade
+  (is (= [] (grade-school/grade db 1))))
+
+(deftest sorted-grade-school
+  (is (= (sorted-map 3 ["Kyle"]
+                     4 ["Christopher" "Jennifer"]
+                     6 ["Kareem"])
+         (-> db
+             (grade-school/add "Jennifer" 4)
+             (grade-school/add "Kareem" 6)
+             (grade-school/add "Christopher" 4)
+             (grade-school/add "Kyle" 3)
+             (grade-school/sorted)))))
+
+(deftest sorted-grade_school-keys-sorted
+  (is (= [3 4 6]
+         (-> db
+             (grade-school/add "Jennifer" 4)
+             (grade-school/add "Kareem" 6)
+             (grade-school/add "Christopher" 4)
+             (grade-school/add "Kyle" 3)
+             (grade-school/sorted)
+             (keys)))))