title: Merge 2 objects values when key is same
body: <p>I have two objects: </p>
  
  <pre><code>{'1': {'a': 1, 'b': 2, 'c': 3}}, {'1': {'d': 4, 'e': 5, 'f': 6}, '2': {'g': 7}}.
  </code></pre>
  
  <p>Is there a function in native javascript (underscore is also being used in the project) where I can put in both objects and get this out?</p>
  
  <pre><code>{'1': {'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5, 'f': 6}, '2': {'g': 7}}
  </code></pre>