title: Javascript Sum array of object values
body: <p>I would think this is a surprisingly common and simple question but I cant seem to find what Im looking for</p>
  
  <p>If I had </p>
  
  <pre><code>var array = [{"a":4,"b":5, "d":6}, {"a":4, "c":5}, {"c":4}]
  </code></pre>
  
  <p>how do I sum the objects to get </p>
  
  <pre><code>{"a":8,"b":5,"c":9, "d":6}
  </code></pre>
  
  <p>using underscore, lodash, or something fairly quick and simple <strong>one liner</strong>?</p>