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Javascript Sum array of object values

I would think this is a surprisingly common and simple question but I cant seem to find what Im looking for

If I had 

var array = [{"a":4,"b":5, "d":6}, {"a":4, "c":5}, {"c":4}]

how do I sum the objects to get 

{"a":8,"b":5,"c":9, "d":6}

using underscore, lodash, or something fairly quick and simple one liner?

Solution

  • You could combine spread(), merge(), and add() to produce:

    _.spread(_.merge)([{}].concat(array, _.add));
// → { a: 8, b: 5, d: 6, c: 13 }