title: Kotlin - How to correctly concatenate a String
body: <p>A very basic question, what is the right way to concatenate a String in Kotlin?</p>
  
  <p>In Java you would use the <code>concat()</code> method, e.g.</p>
  
  <pre><code>String a = "Hello ";
  String b = a.concat("World"); // b = Hello World
  </code></pre>
  
  <p>The <code>concat()</code> function isn't available for Kotlin though. Should I use the <code>+</code> sign?</p>