title: How can I format a String number to have commas and round?
body: <p>What is the best way to format the following number that is given to me as a String?</p>
  
  <pre><code>String number = "1000500000.574" //assume my value will always be a String
  </code></pre>
  
  <p>I want this to be a String with the value: <code>1,000,500,000.57</code></p>
  
  <p>How can I format it as such?</p>