file3db43c467639.R

```{r}
library(tidyverse)
library(rlang)
meddle <- function(.data, ...) {
  formulas <- quos(...)
  xprs <- exprs(!!!formulas)
  vars <- map_chr(xprs, all.vars) #Extract variables from formulas
  build_cases <- function(var, formulas) { #Build case_when statements from the given formulas
    var_sym <- as.symbol(var)
    expr(case_when(!!!formulas, TRUE ~ !!var_sym))
  }
  rules <- map(unique(vars), ~ build_cases(.x, formulas[.x == vars])) #One statement pr var
  names(rules) <- unique(vars) #Naming the statements to direct mutate
  print(rules) #Just to show the workings for twitter
  mutate(.data, !!!rules)
}
meddle(mtcars, gear == 4 ~ 8, vs == 1 ~ NA_real_, gear == 3 ~ 7) %>% tail(10)
```