Rename in dplyr 0.7+ function

Question

I am having difficulty renaming columns in a function using dplyr. I have already found helpful posts on nonstandard evaluation and the use of enquo (e.g., http://dplyr.tidy

Answer 1

Use := if you want programmatically-assigned names on the LHS of expressions.

x <- "mpg"
xnew <- "mpg2"
rename(mtcars, !!xnew := !!rlang::sym(x))