library(shiny)
library(magrittr)

ui <- fluidPage(
  titlePanel("Old Faithful Geyser Data"),
  sidebarLayout(
    sidebarPanel(
      sliderInput("bins",
                  "Number of bins:",
                  min = 1,
                  max = 50,
                  value = 30),
      selectInput("column", "Column", colnames(faithful), selected = "waiting"),
      actionButton("redraw", "Redraw")
    ),
    mainPanel(
      plotOutput("distPlot")
    )
  )
)
server <- function(input, output, session) {
  reac <- reactive(list(bins = input$bins, column  = input$column)) %>% 
    debounce(5000, short_circuit = reactive(input$redraw))
  
  # Only triggered by the debounced reactive
  output$distPlot <- renderPlot({
    x    <- faithful[, reac()$column]
    bins <- seq(min(x), max(x), length.out = reac()$bins   1)
    hist(x, breaks = bins, col = 'darkgray', border = 'white',
         main = sprintf("Histogram of %s", reac()$column))
  })
}
shinyApp(ui, server)