Moving from deprecated summarize_ to new summarize in dplyr

Question

I have a function that calculates the means of a grouped database for a column which is chosen based on the content of a variable VarName. The current function uses

Answer 1

Use !! with as.name or as.symbol:

dat %>% 
    group_by(Grade) %>% 
    summarize(means = mean(!!as.name(VarName), na.rm=T))
    # or summarize(means = mean(!!as.symbol(VarName), na.rm=T))

# A tibble: 2 x 2
#  Grade means
#   
#1  2.00  90.0
#2  3.00  77.5