learn-ocaml

Step 6 : Grading functions for variables

Warning This step is ahead of the current version of [learn-ocaml].

Test functions for variables

There are 3 test functions for variables.

Signatures

val test_variable :
  'a Ty.ty -> string -> 'a -> Learnocaml_report.report

val test_variable_against_solution :
  'a Ty.ty -> string -> Learnocaml_report.report

val test_variable_property :
  'a Ty.ty -> string -> ('a -> Learnocaml_report.report) -> Learnocaml_report.report

Examples

Trivial example with grade_variable

grade_variable is usually used only for trivial examples since it is directly compared to an expected result and not to a solution.

let exercise_0 =
  grade_variable [%ty: int] "forty_two" 42

More classical example with grade_variable_against_solution

grade_variable_against_solution is more versatile and works basically like test_function_against_solution.

let exercise_1 =
  grade_variable_against_solution [%ty: float] "norm"

grade_variable_property

grade_variable_property is used in specific cases when you want to write your own report depending on the value of the graded variable.

let exercise_2 =
  grade_variable_property [%ty: side] "s"
    (
      fun s ->
      match s with
      | Right -> if vect.x > 0. then
                   [ Message ([ Text "Expected value"] , Success 1) ]
                 else if vect.x = 0. then
                   [ Message ([ Text "Wrong value"] , Failure) ;
                     Message ([ Text "The answer should "; Code "Middle" ; Text "."] , Informative) ]
                 else
                   [ Message ([ Text "Wrong value"] , Failure) ;
                     Message ([ Text "The answer should "; Code "Left" ; Text "."] , Informative) ]
      | Left -> if vect.x < 0. then
                  [ Message ([ Text "Expected value"] , Success 1) ]
                else if vect.x = 0. then
                  [ Message ([ Text "Wrong value"] , Failure) ;
                     Message ([ Text "The answer should "; Code "Middle" ; Text "."] , Informative) ]
                 else
                   [ Message ([ Text "Wrong value"] , Failure) ;
                     Message ([ Text "The answer should "; Code "Right" ; Text "."] , Informative) ]
      | Middle -> if vect.x = 0. then
                  [ Message ([ Text "Expected value"] , Success 1) ]
                else if vect.x > 0. then
                  [ Message ([ Text "Wrong value"] , Failure) ;
                     Message ([ Text "The answer should "; Code "Right" ; Text "."] , Informative) ]
                 else
                   [ Message ([ Text "Wrong value"] , Failure) ;
                     Message ([ Text "The answer should "; Code "Left" ; Text "."] , Informative) ]
    )

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