title: Trying to append to Iterable[String]
body: <p>I'm trying to add another string to Iterable[String] for easy concatenation, but the result is not what I expect.</p>
  
  <pre><code>scala&gt; val s: Iterable[String] = "one string" :: "two string" :: Nil
  s: Iterable[String] = List(one string, two string)
  
  scala&gt; s.mkString(";\n")
  res3: String =
  one string;
  two string
  
  scala&gt; (s ++ "three").mkString(";\n")
  res5: String =
  one string;
  two string;
  t;
  h;
  r;
  e;
  e
  </code></pre>
  
  <p>How should I should I rewrite this snippet to have 3 string in my iterable?</p>
  
  <p>Edit: I should add, that order of items should be preserved</p>