Add row to a data frame with total sum for each column

by

See adorn_totals() from the janitor package:

library(janitor)
x %>%
  adorn_totals("row")

#>  Language Files   LOC
#>       C++  4009 15328
#>      Java   210   876
#>    Python    35   200
#>     Total  4254 16404

The numeric columns remain of class numeric.

Disclaimer: I created this package, including adorn_totals() which is made for precisely this task.

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