Avoiding type conflicts with dplyr::case_when

Question

I am trying to use dplyr::case_when within dplyr::mutate to create a new variable where I set some values to missing and recode other values simult

Answer 1

Try this ?

df %>% dplyr::mutate(new = dplyr::case_when(.$old == 1 ~ 5,
                                                  .$old == 2 ~ NA_real_,
                                                  TRUE~.$old))

> df
  old new
1   1   5
2   2  NA
3   3   3