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# Using double brackets
## Understanding inputs and outputs as a list. Their values are accessable via double brackets.

library(shiny)

ui = basicPage(
  textInput("txt", "Text"),
  textOutput("ptxt")
)

server = function(input, output) {
  output[["ptxt"]] <- renderText({ input[["txt"]] })
}

shinyApp(ui, server)

# Using dollar sign
## Most convenient usage. However, there'll be situations when this is not useful.

library(shiny)

ui = basicPage(
  textInput("txt", "Text"),
  textOutput("ptxt")
)

server = function(input, output) {
  output$ptxt <- renderText({ input$txt })
}

shinyApp(ui, server)