This function tests whether an object is a data library. The data library has a class of "lib".
is.lib(x)TRUE or FALSE, depending on whether or not the object is a data library.
# Create format catalog
libname(dat, tempdir())
# Test for "lib" class
is.lib(dat)
# [1] TRUE
is.lib(list())
# [1] FALSE
# Clean up
lib_delete(dat)