| assert | Display an error, and record in a log file, if a condition is false |
| error | Display an error, and record it in a log file. |
| error_if | Display an error, and record in a log file, if a condition is true. |
| has_names | Checks whether the variable has names |
| info | Display a message, and record it in a log file. |
| info_if | Display a message, and record in a log file, if a condition is true. |
| is_dir | Checks whether the variable is a path to an existing directory |
| is_file | Checks whether the variable is a path to an existing file |
| is_in | Checks whether all elements of one variable are in another |
| is_na | Checks whether the variable is NA |
| is_readable | Checks whether the variable is a path to an existing, readable file or directory |
| is_url | Checks whether the variable is a valid URL |
| is_writeable | Checks whether the variable is a path to an existing, writeable file or directory |
| msgr | Extends messages, warnings and errors by adding levels and log files |
| try_catch | Try to evaluate an expressions and capture any messages, warnings or errors |
| try_map | Apply a function over a vector or list, capturing any errors to display at the end |
| try_pmap | Apply a function over a list of vectors, capturing any errors to display at the end |
| warn | Display a warning, and record it in a log file. |
| warn_if | Display a warning, and record in a log file, if a condition is true. |