R has a number of quick, elegant ways to join data frames by a common column. I’d like to show you three of them: base R’s merge() function; dplyr’s join family of functions; data.table’s ...

Then I just need to change each variable name to a generic snippet variable: 1 for the data frame, 2 for the column I want to display as HTML, and 3 for the expandable-row column. Note the ...