title: RxSwift Observe variable fields of struct type in array
body: <p>I have a problem with observing array of my custom type, that have a Variable fields. I want to create observable event, that will check, if value of this fields changed.
  I have a struct:</p>
  
  <pre><code>struct Type {
      let name: Variable&lt;String&gt;
      let email: Variable&lt;String&gt;
  }
  </code></pre>
  
  <p>And I have a array:</p>
  
  <pre><code>let array: Variable&lt;[Type]&gt;
  </code></pre>
  
  <p>All I need is Observable, that will return true, when field name count will be greater than 0. I try to play with Observable.combineLatest, but I cannot convert properly array.</p>