type_sum() gives a brief summary of object type. Objects that commonly
occur in a data frame should return a string with four or less characters.
obj_sum() also includes the size of the object if
tbl_sum() gives a brief textual description of a table-like object,
which should include the dimensions, the data source, and possible grouping
dplyr). The default implementation forwards to
obj_sum(x) type_sum(x) tbl_sum(x) is_vector_s3(x)
an object to summarise. Generally only methods of atomic vectors and variants have been implemented.
obj_sum(1:10)#>  "int "obj_sum(matrix(1:10))#>  "int [10 × 1]"obj_sum(Sys.Date())#>  "date "obj_sum(Sys.time())#>  "dttm "obj_sum(mean)#>  "fun"