grade_result | R Documentation |
Please use
grade_this()
mixed with pass()
, pass_if_equal()
, fail()
, and/or fail_if_equal()
.
grade_result()
and grade_result_strict()
both take a set of
pass_if()
/fail_if()
conditions, evaluate them, and return a final
graded()
object. For grade_result_strict()
to return a correct grade,
every pass_if()
condition must be met, and every fail_if()
condition must
not be met. On the other hand, grade_result()
's final grade reflects the
first satisfied condition (if no conditions are met, the final grade can be
controlled by default_correct
and default_message
).
grade_result(
...,
correct = NULL,
incorrect = NULL,
glue_correct = getOption("gradethis.glue_correct"),
glue_incorrect = getOption("gradethis.glue_incorrect"),
default_correct = "auto",
default_message = NULL,
grader_args = deprecated(),
learnr_args = deprecated()
)
grade_result_strict(
...,
correct = NULL,
incorrect = NULL,
glue_correct = getOption("gradethis.glue_correct_test"),
glue_incorrect = getOption("gradethis.glue_incorrect_test"),
grader_args = deprecated(),
learnr_args = deprecated()
)
condition(x, message, correct)
... |
|
correct |
logical whether the condition is the correct answer. |
incorrect |
A character string to display if the student answer matches a known incorrect answer. |
glue_correct |
A glue string that returns the final correct message
displayed. Defaults to |
glue_incorrect |
A glue string that returns the final incorrect message
displayed. Defaults to |
default_correct |
In the event that no |
default_message |
In the event that no |
grader_args |
A list of parameters passed to
|
learnr_args |
A list of all parameters passed to
|
x |
A formula, function, or value, that returns |
message |
character string for message returned (usually passed in from
|
a function whose first parameter should be an environment that contains
all necessary information to compare the user's result. The result of the returned function
will be a graded()
object containing a formatted correct
or incorrect
message.
grade_code()
# The student submits code that returns `5`
submitted_5 <- mock_this_exercise(.user_code = 2 + 3)
# grade_result() returns a function that is called on the student's
# submission. The *-check chunk of the exercise might contain the following
# grade_result() code. When you're writing your tutorial, you can ignore the
# `(submitted_5)`, we're using that notation here to preview what this
# `grade_result()` will do with the mock submission.
grade_result(
fail_if(~ identical(.result, 4), "Try adding 1"),
pass_if(~ identical(.result, 5), "You got 5, great!"),
fail_if(~ TRUE, "Some generic failing message.")
)(submitted_5)
grade_result_strict(
pass_if(~ identical(.result, 5), "You got 5, great!"),
fail_if(~ !is.integer(.result), "I expected an integer")
)(submitted_5)
# Suppose our exercise asks the student to write a function that adds 1 to
# the value of its only argument. The student submits:
submitted_fn <- mock_this_exercise(
.user_code = function(x) { x + 2 }
)
# We can check submissions for this exercise using `grade_result()`. Note that
# because all checks in this `grade_result()` are `fail_if()` statements, if
# the student's submission passes all of the checks, then `grade_result()`
# will return a correct grade.
grade_result(
fail_if(~ !is.function(.result), "I expected a function."),
fail_if(~ .result(1) != 2, "Your function should add one.")
)(submitted_fn)
# To learn more about using grade_result() and grade_code() with learnr, see:
## Not run:
gradethis_demo()
## End(Not run)
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