title: Sum of Javascript Object
body: <p>I have a javascript object in a dictionary that looks like this:</p>
  
  <p><code>{ date: "2010/01",
  San_Francisco201001: 1,
  San_Francisco201002: 2,
  San_Francisco201003: 3,
  },
  { date: "2010/02",
  San_Francisco201001: 0,
  San_Francisco201002: 1,
  San_Francisco201003: 2,
  }</code></p>
  
  <p>And would like to find</p>
  
  <p><code>{ date: "2010/01", sum: 6, ),  { date: "2010/02", sum: 3, )</code></p>
  
  <p>It gets a bit tricky, because the property names are arbitrary. Any clue how to go about doing this?</p>
  
  <p>Thanks.</p>