title: Add space after comma to string
body: <p>I have this:</p>
  
  <pre><code>var $string = 'hello,world';
  
  $(".content").text(function(i, $string) {
      return $string.replace(/,/g, ", ");
  });
  </code></pre>
  
  <p>Aiming to add comma after space. What am I doing wrong? The problem is likely how I am using the variable in the function. Entry level stuff.</p>