title: JavaScript counting values in nested objects
body: <p>I have an object that looks like this:</p>
  
  <pre><code>{
    "Boiler Emissions": {
                          "Manhattan": 2.7,
                          "Bronx": 3.2
                        },
    "Benzene Concentration": {
                               "Manhattan": 2.1,
                               "Bronx": 3.5
                             }
  }
  </code></pre>
  
  <p>And I want to count the values of <code>Manhattan</code> and <code>Bronx</code> from both sub objects and get a <code>result</code> that looks like this:</p>
  
  <pre><code>{
   "Manhattan": 4,8,
   "Bronx": 6,7
  }
  </code></pre>
  
  <p>How do I count these nested values?</p>