dplyr - groupby on multiple columns using variable names

Question

I am working with R Shiny for some exploratory data analysis. I have two checkbox inputs that contain only the user-selected options. The first checkbox input contains only

Answer 1

With dplyr 1.0.0, we have the following possibility based on the "normal" group_by:

library(dplyr)

group_cols <- c("vs", "am")

mtcars %>% 
  group_by(across(all_of(group_cols))) %>% 
  summarize(mean_wt = mean(wt))