title: scala how to access to element in tuple in list
body: <p>I have a list where two element are tuple. 
  How can I access to the elements of the tuple?</p>
  
  <pre><code>package prova_package
  
  object prova_worksheet {
    println("Welcome to the Scala worksheet")       //&gt; Welcome to the Scala worksheet
    var l = List((1,'a'),(2,'b'),3,4)               //&gt; l  : List[Any] = List((1,a), (2,b), 3, 4)
      var u = (1,'a')                           //&gt; u  : (Int, Char) = (1,a)
      u._1                                      //&gt; res0: Int = 1
   //l(1)._1  //this does not work. Why?  How can I access to the value 'b' ?
  
  
  }
  </code></pre>
  
  <p>I want the value 'b'</p>