I think that Shiny Basics lesson 4, found at Shiny - Display reactive output, is missing text from the first code snippet on the page.
Here is the code that is provided:
ui <- page_sidebar(
title = "censusVis",
sidebar = sidebar(
helpText(
"Create demographic maps with information from the 2010 US Census."
),
selectInput(
"var",
label = "Choose a variable to display",
choices =
c("Percent White",
"Percent Black",
"Percent Hispanic",
"Percent Asian"),
selected = "Percent White"
),
sliderInput(
"range",
label = "Range of interest:",
min = 0,
max = 100,
value = c(0, 100)
)
),
)
Below the snippet it states ,"Notice that textOutput takes an argument, the character string "selected_var". Each of the *Output functions require a single argument: a character string that Shiny will use as the name of your reactive element."
It seems to me that there is supposed to be a textOutput function call after the last comma in the code provided here, but there isn't. Since no authors for this document are listed and there is no avenue for feedback, I figured I'd post here in case somebody knows who to talk to to get this fixed.