How to merge multiple array of object by ID in javascript?

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With lodash, a lot more readable I think.

var arr1 = [{"memberID":"81fs","RatingCW":4.5},{"memberID":"80fs","RatingCW":4},{"memberID":"82fs","RatingCW":5},{"memberID":"83fs","RatingCW":3},{"memberID":"84fs","RatingCW":4.7}],
    arr2 = [{"memberID":"80fs","ratingWW":4},{"memberID":"81fs","ratingWW":4.5},{"memberID":"83fs","ratingWW":3},{"memberID":"82fs","ratingWW":5},{"memberID":"84fs","ratingWW":3.5}],
    arr3 = [{"memberID":"80fs","incoCW":4},{"memberID":"81fs","incoCW":4.5},{"memberID":"82fs","incoCW":5},{"memberID":"83fs","incoCW":3},{"memberID":"84fs","incoCW":4.5}],
    arr4 = [{"memberID":"80fs","incoWW":3},{"memberID":"81fs","incoWW":2.5},{"memberID":"82fs","incoWW":5},{"memberID":"83fs","incoWW":3},{"memberID":"84fs","incoWW":6.5}];

var merged = _(arr1)
  .concat(arr2, arr3, arr4)
  .groupBy("memberID")
  .map(_.spread(_.merge))
  .value();

console.log(merged);
<script src="https://cdn.jsdelivr.net/lodash/4.13.1/lodash.min.js"></script>

Here is the codepen: http://codepen.io/kuhnroyal/pen/Wxzdmw

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