For Loop - Box plots

Question

In R, how do I create boxplots of specific columns with a for loop?

So far I have

for(colnames in c("Delivery, Free_wifi, Service, Alcohol")) {
    boxplot(df$Price ~ colnames) }

Answer 1

Using eval and as.name()

df=data.frame(Price=c(rnorm(4,1,1),rnorm(5,2,1.5)),Delivery=c(rep('A',4),rep('B',5)),`Another Column`=c(rep('aa',3),rep('bb',3),rep('cc',3)),check.names = FALSE)
for(colnames in c("Delivery","Another Column")) {
  boxplot(Price ~ eval(as.name(colnames)),data=df) #eval
}