I have JSON like this:
[
{
platformId: 1,
payout: 15,
numOfPeople: 4
},
{
platformId: 1,
payout: 12,
numOfPeople: 3
},
{
platformId: 2,
payout: 6,
numOfPeople: 5
},
{
platformId: 2,
payout: 10,
numOfPeople: 1
},
]
And I want to Group it by platformId
with sum of payout
and numOfPeople
.
I.e. in result I want JSON like this:
[
"1": {
payout: 27,
numOfPeople: 7
},
"2": {
payout: 16,
numOfPeople: 6
}
]
I tried to use underscore.js
's _.groupBy
method, and it groups fine, but how I can get the SUM of objects properties values like I demonstrated above?
Here's a Lodash solution to this kind of problem. It's similar to Underscore, but with some more advanced features.
const data = [{
platformId: 1,
payout: 15,
numOfPeople: 4
},
{
platformId: 1,
payout: 12,
numOfPeople: 3
},
{
platformId: 2,
payout: 6,
numOfPeople: 5
},
{
platformId: 2,
payout: 10,
numOfPeople: 1
},
];
const ans = _(data)
.groupBy('platformId')
.map((platform, id) => ({
platformId: id,
payout: _.sumBy(platform, 'payout'),
numOfPeople: _.sumBy(platform, 'numOfPeople')
}))
.value()
console.log(ans);
<script src="https://cdn.jsdelivr.net/lodash/4.17.4/lodash.min.js"></script>
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