title: What do all of Scala's symbolic operators mean?
body: <p>Scala syntax has a lot of symbols. Since these kinds of names are difficult to find using search engines, a comprehensive list of them would be helpful.</p>
  
  <p>What are all of the symbols in Scala, and what does each of them do?</p>
  
  <p>In particular, I'd like to know about <code>-&gt;</code>, <code>||=</code>, <code>++=</code>, <code>&lt;=</code>, <code>_._</code>, <code>::</code>, and <code>:+=</code>.</p>