Sum all data in array of objects into new array of objects

Question

I have an array of objects that looks like this:

var data = [{costOfAirtickets: 2500, costOfHotel: 1200},{costOfAirtickets: 1500, costOfHotel: 1000}]
         


        

Answer 1

Here is a lodash approach

_(data).flatMap(_.entries).groupBy(0).mapValues(v=>_.sumBy(v, 1)).value()

It will sum by all the unique keys.

var data = [{costOfAirtickets: 2500, costOfHotel: 1200},{costOfAirtickets: 1500, costOfHotel: 1000}];

var res = _(data).flatMap(_.entries).groupBy(0).mapValues(v=>_.sumBy(v, 0)).value();

console.log(res);

Wrap your result to a [...] or use a .castArray() at the end before unwrapping using .value() in case you want a array as result.