title: How to add key value-pair to a Object?
body: <p>I want to update my Object by adding a more key-value pair.</p>
  
  <pre><code>Object options = {
    "first_name": "Nitish",
    "last_name" : "Singh"
  }
  </code></pre>
  
  <p>after initializing the Object I want to add one more key and value. Is there any way to do this.</p>
  
  <p>after adding one more key-value pair my object will look like this</p>
  
  <pre><code>options = {
    "first_name" : "Nitish",
    "last_name"  : "Singh"
    "middle_name": "Kumar"
  }
  </code></pre>