Group 2: Exercise 1 (Server)

2. To make the prior changes work we need to create a new module to:

• Return the filter function as a reactive value.

coltypeServer <- function(id, data) {
  moduleServer(id, function(input, output, session) {
    
    # (OPTIONAL)
    # I just want to see the col types available in the data to explore
      
    # Listing all valid col types in the data()
    col_type_options <- reactive({
      sapply(data(), function(x){
        if(is.numeric(x)) return("numeric")
        if(is.character(x)) return("character")
        if(is.factor(x)) return("factor")
      }) |>
        unique()
    })
      
    # Update based on available available columns
    observeEvent(col_type_options(),{
      updateSelectInput(session, "col_type", choices = col_type_options())
    })
     
     
    # (NEEDED PART)
    
    # Selecting function to return
    reactive({
      switch(input$col_type,
             "numeric" = is.numeric,
             "character" = is.character,
             "factor" = is.factor)
    })
  }
  )
}