title: Change boolean in the array of objects
body: <p>I have radio buttons and i need change selected radio button to true and other to false</p>
  
  <pre><code>changeHandler (index, event) {
      this.array[index].checked = true;
  }
  </code></pre>
  
  <p>I have the following array structure:</p>
  
  <pre><code>[
   {checked: false, title: 'first'},
   {checked: false, title: 'second'},
   {checked: false, title: 'third'}
  ]
  </code></pre>
  
  <p>When i select radio "first" i need to change this obj value to true, and others to false, and so on.</p>