How to create array of sum of values in lodash

Question

My data is

[
[{"2018":63},{"2019":28},{"2020":21}],
[{"2018":103},{"2019":200},{"2020":54}],
[{"2017":74},{"2019":76},{"2020":31}]
]

and I want array of sum of the values like

[112, 357, 181]

Thanks

Ori Drori · Accepted Answer · 2021-10-21 07:22:52Z

1

Map the array. Flatten each sub-array to an array of values, and sum them:

const arr = [[{"2018":63},{"2019":28},{"2020":21}],[{"2018":103},{"2019":200},{"2020":54}],[{"2017":74},{"2019":76},{"2020":31}]]

const result = _.map(
  arr, 
  s => _.sum(_.flatMap(s, _.values))
)

console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js" integrity="sha512-WFN04846sdKMIP5LKNphMaWzU7YpMyCU245etK3g/2ARYbPK9Ub18eG+ljU96qKRCWh+quCY7yefSmlkQw1ANQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>

answered Oct 21, 2021 at 7:22

Ori Drori

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