Stuck on a function programming with R (language)

# To take this one step further, write a function `get_summary_info()`, # that takes in a data frame and returns a *list* of information for each # column (where the *keys* of the returned list are the column names, and the # _values_ are the summary information returned by the `get_col_info()` function # The suggested approach is to use the appropriate `*apply` method to # do this, though you can write a loop