title: String interpolation vs concatenation
body: <p>Is string interpolation more performant than concatenation to build a string in scala? For example:</p>
  
  <pre><code>val myVal = "def"
  val test = s"abs${myVal}ghi"
  </code></pre>
  
  <p>vs</p>
  
  <pre><code>val test = "abc" + myVal + "ghi"
  </code></pre>
  
  <p>I am asking because I need to write the <code>toString</code> method for a <code>class</code> which has <em>a lot</em> of parameters and the interpolated string therefore gets really long and confusing and I would like to break it up into multiple lines but fear that it will perform badly if I concatenate.</p>