title: {nativescript} indexOf array
body: <p>I have an array like below. When I using <code>this.itemsgroupcustomer.indexOf("Perorangan")</code>, it return -1. I don't have any idea why this is wrong. Please help.</p>
  
  <pre><code>viewModel.itemsgroupcustomer = [
          {title: "Perusahaan"},
          {title: "Perorangan"}
      ];
  </code></pre>