How to calculate sum of array in JavaScript

Question

I want to calculate sum of array data in JavaScript.

Array :

[
  {
    red_team: {
      count: 2,
      money: 3000,
    },
    blue_team: {
      count: 10,
      money: 100000,
    },
  },
  {
    red_team: {
      count: 1,
      money: 1000,
    },
    blue_team: {
      count: 100,
      money: 200000,
    },
  }
]

Expected Result :

{
  red_team: {
    count: 3,
    money: 4000,
  },
  blue_team: {
    count: 110,
    money: 300000,
  },
}

Note : red_team & blue_team is an Enum.

how can I calculate it ?

Answer 1

Spread the array into lodash's _.mergeWith(), and create a customizer that sums number, but returns undefined for all other types, so that lodash would handle all other cases:

const data = [{"red_team":{"count":2,"money":3000},"blue_team":{"count":10,"money":100000}},{"red_team":{"count":1,"money":1000},"blue_team":{"count":100,"money":200000}}]


const result = _.mergeWith({}, ...data, (a, b) => 
  _.isNumber(a) ? a + b : undefined
)

console.log(result)

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