R - dplyr - ifelse and filter

Question

I am building a widget on Shiny, and I would like to have the option \"all\" to select all of the data available, and don\'t perform a filtering.

Basically, I would

Answer 1

Here is my try. If folt="All" then there is no filter, otherwhise just the Cars with carb==filt is returned.

   filt <-sample(c("All", unique(mtcars$carb)),1)
    filt
    if(filt=="All"){
      data1<- mtcars
    } else {
      data1<- filter(mtcars, mtcars$carb==filt)
    }

should do the trick