title: Scala Tuple to String (using mkString)
body: <p>Suppose I have a list of tuples</p>
  
  <pre><code>('a', 1), ('b', 2)...
  </code></pre>
  
  <p>How would one get about converting it to a String in the format</p>
  
  <pre><code>a 1
  b 2
  </code></pre>
  
  <p>I tried using <code>collection.map(_.mkString('\t'))</code> However I'm getting an error since essentially I'm applying the operation to a tuple instead of a list. Using <code>flatMap</code> didn't help either</p>