These functions return information on some public Google Sheets we've made
available for examples and testing. For example, function names that include
gap refer to a spreadsheet based on the Gapminder data. This sheet is
"published to the web" and you can visit it in the browser:
Usage
gs_gap_key()
gs_gap_url()
gs_gap_ws_feed(visibility = "public")
gs_gap()
Arguments
visibility
either "public" (the default) or "private"; used when
producing a worksheets feed
Value
the key, browser URL, worksheets feed or googlesheet
object corresponding to one of the example sheets