title: Does assignment with a comma work?
body: <p>Why does <code>aaa = 1,2,3</code> work and set the value of <code>aaa</code> to <code>1</code>?</p>
  
  <p>Why doesn't <code>var bbb = 1,2,3</code> work?</p>
  
  <p>Why does <code>var bbb = (1,2,3)</code> work and set the value of <code>bbb</code> to <code>3</code>?</p>
  
  <p><img src="https://i.stack.imgur.com/VDxr0.png" alt="Example console session"></p>