如何在 JavaScript 中计算数组的总和

Question

我想在 JavaScript 中计算数组数据的总和。

数组：

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

预期结果：

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

注意：red_team＆amp; blue_team 是一个枚举。

我怎样才能计算它？

Answer 1

将数组展开到 lodash 的 _.mergeWith() 中，并创建一个对数字求和的定制器，但对于所有其他类型返回 undefined，以便 lodash 能够处理所有其他情况：

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)

<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>

Answer 2

根据上面的评论，有无限种方法可以做到这一点。我刚刚想出了一个（诚然相当冗长）

详细的解决方案：

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

function sumByKeyAndProperty(arr, key, property){
  let sum = 0
  arr.forEach((obj) => {
    sum+=obj[key][property]
  })
  return sum
}

returnObj = {
  red_team: {
    count: sumByKeyAndProperty(arr, 'red_team', 'count'),
    money: sumByKeyAndProperty(arr, 'red_team', 'money'),
  },
  blue_team: {
    count: sumByKeyAndProperty(arr, 'blue_team', 'count'),
    money: sumByKeyAndProperty(arr, 'blue_team', 'money'),
  }
}

console.log(returnObj)