Some rudimentary string cleaning is performed to allow for different ways of saying the same things (removing spaces, changing single quotes to double quotes, changing TRUE to T ...).
check_code(state, regex, fixed = FALSE, times = 1, missing_msg = NULL, append = TRUE, drop_comments = FALSE)
| state | the state to start from |
|---|---|
| regex | A set of strings/regexes that should be in the student code. |
| fixed | if TRUE, strings are treated literally. If FALSE, strings are treated as regex patterns. |
| times | how often should any of the strings be matched? |
| missing_msg | Custom feedback in case the pattern is not contained often enough in the student's submission. |
| append | Whether or not to append the feedback to feedback built in previous states |
| drop_comments | Logical value indicating whether or not to remove comments from these student code before looking for the pattern. Defaults to FALSE for backwards compatibility reasons. |
Using these function should be a last resort, as there are myriad ways of solving the same problem with R!
if (FALSE) { # Example 1 TRUE & FALSE # SCT ex() %>% check_code(c("TRUE & FALSE", "FALSE & TRUE"), fixed = TRUE) # Example 2: "Hello, world!" # SCT, robust to small typos ex() %>% check_code("[H|h]ello,*\\s*[W|w]orld\\!*") }