Grouping by multiple fields in JavaScript or CoffeeScript using Underscore
Software Engineering
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How to group by mupliple fields using Underscore for CoffeeScript and JavaScript:
# Group by field1 and field2
groupedData = _.groupBy(data, (d) ->
"#{d.field1}-#{d.field2}"
)// Group by field1 and field2
var groupedData = _.groupBy(data, function(d) {
return d.field1 + "-" + d.field2;
});