title: What does %||% do in R?
body: <p>I am trying to run some <a href="https://github.com/hadley/devtools/blob/master/R/install-github.r" rel="noreferrer">R code from github</a>, however these functions use a command <code>%||%</code>, that doesn't seem to be in base R. What exactly does this function do and what packages, if any, do I need to get it to work on my machine? As you can imagine, this particular string is un-Google-able since it's entirely special characters.</p>