Merge pull request #465 from petertseng/grade-school-stub

grade-school: Add signatures to stub so it runs tests

Author: rbasso

exercises/grade-school/.meta/DONT-TEST-STUB

@@ -8,6 +8,6 @@ and implement the following functions:
 - `grade`
 - `sorted`
 
-You will find a dummy data declaration already in place, but it is up to you to
-define the functions and create a meaningful data type, newtype or type
-synonym.
+You will find a dummy data declaration and type signatures already in
+place, but it is up to you to define the functions and create a meaningful
+data type, newtype or type synonym.

exercises/grade-school/HINTS.md

@@ -2,10 +2,14 @@ module School (School, add, empty, grade, sorted) where
 
 data School = Dummy
 
-add = undefined
+add :: Int -> String -> School -> School
+add gradeNum student school = undefined
 
+empty :: School
 empty = undefined
 
-grade = undefined
+grade :: Int -> School -> [String]
+grade gradeNum school = undefined
 
-sorted = undefined
+sorted :: School -> [(Int, [String])]
+sorted school = undefined