Shiny : How to modify reactive object

Question

I have a reactive object that i want to modify when the user click on the GO button. I tried this code and Per gives a great result. Now I want to do more than

Answer 1

I used reactiveValues instead of reactiveVal and it works perfectly

Thanks @Florian

server <- shinyServer(function(input, output) {

   in_data <- reactive({
       inFile <- input$e
       read.csv(inFile$datapath)
    })

  RA_s <- reactiveValues(ra = NULL)
  RA_s$ra <- in_data() # intiialize the reactiveValue


  # an observer to update the reactiveValue RA_s
  observeEvent(input$go, {
    # read the current value
   current_value <- RA_s$ra

   # update the value
   new_value <- current_value[-(1)]

   # write the new value to the reactive value
   RA_s$ra <- new_value


  })
  output$x <- renderDataTable({
   RA_s$ra
  })
})


ui <- shinyUI(
  fluidPage(
    fileInput('e', 'E'),
    actionButton("go","GO!"),
    dataTableOutput('x')     
  )
)
shinyApp(ui,server)