Nothing
count_at to perform count_by for multiple variables and return the aggregated results in one tibblefirst_non_nas_at and first_which_non_na_at to retrieve the first non na value, or which values are not na, using column selection like in dplyr's selectAny scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.