title: Replacement of Elvis Operator of Angular2 in Typescript
body: <p>Is there any operator in the typescript which is used similer to <code>Elvis Operator</code> of angular2, i mean to say
  let supppose i have to get key from object like this:</p>
  
  <pre><code>this.myForm.name.first_name
  </code></pre>
  
  <p>and in case first_name does't exist so it will throw error <code>first_name of undefined</code>,</p>
  
  <p>yes i can handel this error using <code>Ternary operator</code> of typescript like this</p>
  
  <pre><code>this.myForm.name ? this.myForm.name.first_name : ''
  </code></pre>
  
  <p>but sometimes keys are getting too long,</p>
  
  <p>so is there any operator like <code>Elvis Operator</code> of angular2 in the typescript so that i can use like this</p>
  
  <pre><code>this.myForm?.name?.first_name
  </code></pre>