title: combining properties in an array
body: <p>Is there a way to add a property to the items in this array called <code>fullName</code> that combines <code>firstname</code> and <code>lastname</code>?</p>
  <pre><code>let employeeNames = [ { firstName: &quot;Collin&quot;, lastName: &quot;Sexton&quot; }, { firstName: &quot;Darius&quot;, lastName: &quot;Garland&quot; } ]
  </code></pre>
  <p>Expected result:</p>
  <pre><code>employeeNames = [ { firstName: &quot;Collin&quot;, lastName: &quot;Sexton&quot;, fullName: &quot;Collin Sexton&quot; }, { firstName: &quot;Darius&quot;, lastName: &quot;Garland&quot;, fullName: &quot;Darius Garland&quot; } ]
  </code></pre>