title: Switch statements: do you need the last break? (Javascript mainly)
body: <p>When using a <code>switch()</code> statement, you add <code>break;</code> in between separate <code>case:</code> declarations.  But what about the <strong>last</strong> one?  </p>
  
  <p>Normally I just leave it off, but I'm wondering if this has some performance implication I'm not thinking about?</p>
  
  <p>I've been wondering about this for a while and don't see it asked elsewhere on Stack-O, but sorry if I missed it.</p>
  
  <p>I'm mainly asking this question regarding Javascript, although I'm guessing the answer will apply to all <code>switch()</code> statements.</p>