title: How to combine two observable arrays of the same type in angular 6?
body: <p>I cannot seem to figure out how to combine two observable arrays. This is using Angular 6, rxjs 6.3.2</p>
  
  <p>Example code:</p>
  
  <pre><code>var arrayOfUsers = this.httpCallToGetObservableArrayOfUsers();
  var anotherArrayOfUsers = this.httpCallToGetADifferentArrayOfUsers();
  
  //how do I combine these two Observable&lt;User[]&gt;?
  </code></pre>
  
  <p>Thanks in advance</p>