title: How to push values into Object
body: <p>I have an Object like this.</p>
  
  <pre><code>var myObj = {
    "name":"John",
    "age":30,
    "cars": {
      "car1":"Ford",
      "car2":"BMW",
      "car3":"Fiat"
    }
  }
  </code></pre>
  
  <p>I know to add an entry like this.</p>
  
  <pre><code>myObj['model']='XUV';
  </code></pre>
  
  <p>but I want to add an entry inside the cars object (adding new 'Audi' car as car4) 
  Can you show me how to add this?</p>
  
  <p>Final output should be like.</p>
  
  <pre><code> var myObj = {
        "name":"John",
        "age":30,
        "cars": {
          "car1":"Ford",
          "car2":"BMW",
          "car3":"Fiat",
          "car4":"Audi"
        }
  
  }
  </code></pre>