Use/show new dplyr::across function

[lgatto]

Use cases search as, where interroA is in wide format

interroA %>% 
  privot_longer(names_to = "interro", values_to = "res", starts_with("interro")) %>%
  group_by(interro) %>%
  summarise(mean_interro = mean(res))

or

interroA %>%
   summarise(mean1 = mean(interro1), mean2 = mean(interro2), ...)

will be possible with

interroA %>%
   summarise(across(starts_with("interro"), mean))

See https://www.tidyverse.org/blog/2020/04/dplyr-1-0-0-colwise/