return the classes of a list of objects
sclass(x, ...)
x: an S3 object inheriting from class list, or an S4 object....: additional parameters are ignored.character vector with the class of each list element, or column name, depending upon the input class(x).
This function takes a list and returns the classes for each object in the list. In the event an object class has multiple values, the returned object is a list, otherwise is a vector. If x is an S4 object, then methods::slotNames(x) is used, and the class is returned for each S4 slot.
When x is a data.frame, data.table, tibble, or similar DataFrame table-like object, the class of each column is returned.
For the special case where x is an S4 object with one slotName ".Data", the values in x@.Data are coerced to a list. One example of this case is with limma::MArrayLM-class.
When x is a matrix, the class of each column is returned for consistency, even though the class of each column should be identical.
For more more information about a list-like object, including the lengths/dimensions of the elements, see sdim() or ssdim().
sclass(list(LETTERS=LETTERS, letters=letters)); sclass(data.frame(B=letters[1:10], C=2:11))
Other jam list functions: cPaste(), heads(), jam_rapply(), list2df(), mergeAllXY(), mixedSorts(), rbindList(), relist_named(), rlengths(), sdim(), uniques(), unnestList()