How to add a row names to a data frame in a magrittr chain

Question

I want to do the opposite of: Convert row names into first column

Somewhere down the chain of pipes I would like to add row names to the data frame, for example, I w

Answer 1

The tbl_df changes it to row number. So, we don't need to do any extra effort in changing row names.

library(dplyr)
tbl_df(mtcars)

The same applies if we are using data.table

as.data.table(mtcars)

---

As the OP commented about changing the names to something other than the sequence of rows, if we use the same assignment showed in the other post

 mtcars %>%
     `row.names<-`(c(letters, LETTERS)[1:32]) %>%
      group_by(gear) %>%
      slice(1)
#     mpg   cyl  disp    hp  drat    wt  qsec    vs    am  gear  carb
#            
#1  21.4     6 258.0   110  3.08 3.215 19.44     1     0     3     1
#2  21.0     6 160.0   110  3.90 2.620 16.46     0     1     4     4
#3  26.0     4 120.3    91  4.43 2.140 16.70     0     1     5     2

As we can see, the row names changes to sequence again. So, if we change the row names to something else and do the dplyr chain operations, the previous change is worthless.