In rstudio-education/grader: Automated Feedback for Student Exercises in 'learnr' Tutorials

Always debug

The first method is the most straight-forward. Inside the *-check or *-error-check chunks for your exercise, simply call debug_this():

```r`r ''`
debug_this()
```

Every time you submit code for feedback via Submit Answer, the debug information will be printed.

Debug specific cases

On the other hand, if you want to debug a specific submission, such as a case where a submission isn't matching any of your current grading conditions, you can call debug_this() wherever you like inside [grade_this()].

```r`r ''`
grade_this({
  pass_if_equal(3, "Good work?")

  # debug the submission if it is somehow equal to 2
  if (.result == 2) {
    debug_this()
  }
})
```

Debug default fail condition

It's common to have the grade-checking code default to an incorrect grade with code feedback by calling fail() at the end of the checking code in [grade_this()]. During development of a tutorial, you may want to have this default fail() return the debugging information rather than a failure.

By setting the global option gradethis.fail to use debug_this(),

```r`r ''`
library(learnr)
library(gradethis)
gradethis_setup()

option(gradethis.fail = "{debug_this()}")
```

you can see the values that are available to you during the submission check whenever your test submissions pass through your other checks.

```r`r ''`
grade_this({
  pass_if_equal(3, "Good work?")

  fail()
})
```

Don't forget to reset or unset the gradethis.fail option when you're done working on your tutorial.

rstudio-education/grader documentation built on July 6, 2023, 8:48 a.m.