Grouping by multiple fields in JavaScript or CoffeeScript using Underscore

# Group by field1 and field2
 groupedData = _.groupBy(data, (d) ->
   "#{d.field1}-#{d.field2}"
 )
groupby.coffee
// Group by field1 and field2
 var groupedData = _.groupBy(data, function(d) {
    return d.field1 + "-" + d.field2;
 });
groupby.js

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