title: What's the operator << (double less than) in gradle?
body: <p>The following piece of code defines 4 gradle tasks:</p>
  
  <pre><code>4.times { counter -&gt;
      task "task$counter" &lt;&lt; {
          println "I'm task number $counter"
      }
  }
  </code></pre>
  
  <p>But what is the &lt;&lt; operator? What does it do in groovy?</p>