title: Dart - Encode and decode base64 string
body: <p>How to native convert <em>string</em> -> <em>base64</em> and <em>base64</em> -> <em>string</em></p>
  
  <p>I'm find only this <a href="http://www.dartlang.org/docs/dart-up-and-running/contents/ch03.html#ch03-crypto-base64" rel="noreferrer">bytes to base64string</a></p>
  
  <p>would like this:</p>
  
  <pre class="lang-dart prettyprint-override"><code>String Base64String.encode();
  String Base64String.decode();
  </code></pre>
  
  <p>or ported from another language is easier?</p>