title: What does () => {} mean in gulpfile.js
body: <p>I'm in the learning path of js, and just started using the yeoman generators. And I use gulp for the pre-processing and other stuffs. When I was going through the gulpfile.js, I found this block of code.</p>
  
  <pre><code>gulp.task('serve', ['styles', 'html', 'watch'], () =&gt; {
      browserSync({
          notify: false,
          port: 9000,
          server: {
              baseDir: 'app'
          }
      })
  });
  </code></pre>
  
  <p>I can understand that when we execute <code>gulp-serve</code>, it runs styles, html and watch task and opens a development server in the port 9000.</p>
  
  <p>But I don't understand what does this <code>() =&gt;</code> means.</p>
  
  <p>Will be very grateful if someone can tell me what does that mean.</p>
  
  <p>Thanks in advance.</p>