title: Primitive keywords for R
body: <p>What are the primitive keywords in R? For example, in Python <code>del</code>, <code>assert</code>, <code>if</code>, <code>else</code> and so on are all keywords. In R it seems only some of these are keywords, but some are rather functions from some (unknown) library, or some weird "syntax hacks", such as using <code>df[-c(1),]</code> to delete the first row of observations*. <a href="http://adv-r.had.co.nz/Vocabulary.html" rel="nofollow noreferrer">Here</a> I found some of list, but I'm not sure if those aren't just basic functions, instead of primitive keywords.<br>
  Unfortunately the documentation of R is overwhelming and after spending some time with it, I was able to find such a list.</p>