title: How to append an element to an Iterator in scala
body: <p>I want to append an element to the end of an iterator like this:</p>
  
  <pre><code>val a = Iterator(3, 4)
  val b = a + 5 // expect b == Iterator(3,4,5), but there is no + method
  val b2 = a ++ Iterator(5) // That works, but not concise.
  </code></pre>
  
  <p>Is there a better way than <code>b2</code> to make this?</p>