Returned aggregated result as an array : mongodb

I have this function in my db.js wrapper library for mongodb: findAllSorted: function(name, sortBy, callback) { db.createCollection(name, function(err, collection) { collection.aggregate([{$sort: sortBy}], function(err, result) { console.log(result); // I want to return result as an array. }); }); }, I would like to return `result` as an array via a callback. How would I do this? For instance I invoke this function with `db.findAllSorted('quotes', {unitprice: -1}, callback);` which as I understand should return my list of stock quotes in highest-to-lowest unitprice descending order. Thanks.

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