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合并缺少键的对象

user10381316 发表于 Dev
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我有两个这样的对象：

const object1 = {first: [{timestamp: "2018-12-09T16:00:00.000", count: 3}], second: [{timestamp: "2018-12-09T17:00:00.000", count: 2}], third: [{timestamp: "2018-12-09T18:00:00.000", count: 2}]}
const object2 = {first: [{timestamp: "2018-12-09T16:00:00.000", count: 0}], second: [{timestamp: "2018-12-09T17:00:00.000", count: 0}], third: [{timestamp: "2018-12-09T18:00:00.000", count: 3}]}

（object1并且object2长度可以大于1的数组，例如：

const object1 = {first: [{timestamp: "2018-12-09T16:00:00.000", count: 3}, {timestamp: "2018-12-09T16:30:00.000", count: 5}], second: [{timestamp: "2018-12-09T17:00:00.000", count: 2}], third: [{timestamp: "2018-12-09T18:00:00.000", count: 2}]}
const object2 = {first: [{timestamp: "2018-12-09T16:00:00.000", count: 0}, {timestamp: "2018-12-09T16:30:00.000", count: 0}], second: [{timestamp: "2018-12-09T17:00:00.000", count: 0}], third: [{timestamp: "2018-12-09T18:00:00.000", count: 3}]}

）

我想要一个相同格式的对象，但：

  • 键的值timestamp应该是实际数据而不是字符串（所以我需要这样做new Data(timestamp)）
  • 键的值count应为总和

因此，预期结果是：

const res = {first: [{timestamp: 2018-12-09T16:00:00.000, count: 3}], second: [{timestamp: 2018-12-09T17:00:00.000, count: 2}], third: [{timestamp: 2018-12-09T18:00:00.000, count: 5}]}

（如果object1和的object2数组长度大于1：

const res = {first: [{timestamp: 2018-12-09T16:00:00.000, count: 3}, {timestamp: "2018-12-09T16:30:00.000", count: 5}], second: [{timestamp: 2018-12-09T17:00:00.000, count: 2}], third: [{timestamp: 2018-12-09T18:00:00.000, count: 5}]}

）

我mergeWith以这种方式使用Lodash：

const merged = _.mergeWith(object1, object2, (objValue, srcValue) => [
  { count: objValue[0].count + srcValue[0].count },
])
const r = Object.entries(merged).map(([key, value], i) => {
  return { number: key, timestamp: value.map(convertTimestamp) }
})
console.log('r: ', r)

在哪里convertTimestamp：

const convertTimestamp = (d) => ({
  ...d,
  timestamp: new Date(d.timestamp),
})

结果如下：

[
  {
    "number": "first",
    "timestamp": [
      {
        "count": 3,
        "timestamp": null
      }
    ]
  },
  {
    "number": "second",
    "timestamp": [
      {
        "count": 2,
        "timestamp": null
      }
    ]
  },
  {
    "number": "third",
    "timestamp": [
      {
        "count": 5,
        "timestamp": null
      }
    ]
  }
]

显然，它不起作用。它有3个问题：

  1. 没有正确值的嵌套对象
  2. 时间戳不正确
  3. ifobject1和object2具有相同的键，但如果是：

const object1 = {first: [{timestamp: "2018-12-09T16:00:00.000", count: 3}], second: [{timestamp: "2018-12-09T17:00:00.000", count: 2}], third: [{timestamp: "2018-12-09T18:00:00.000", count: 2}]}

const object2 = {second: [{timestamp: "2018-12-09T17:00:00.000", count: 0}], third: [{timestamp: "2018-12-09T18:00:00.000", count: 3}]}

（缺少object2 first），该过程不起作用...

我需要帮助

这里是一个可测试的代码：

function mergeData(object1, object2) {
  const merged = _.mergeWith(object1, object2, (objValue, srcValue) => [
    { count: objValue[0].count + srcValue[0].count},
  ])
  const r = Object.entries(merged).map(([key, value], i) => {
    return { number: key, timestamp: value.map(convertTimestamp) }
  })
  return r
}

const convertTimestamp = (d) => {
  return ({
    ...d,
    timestamp: new Date(d.timestamp),
  })
}

const object1 = {first: [{timestamp: "2018-12-09T16:00:00.000", count: 3}], second: [{timestamp: "2018-12-09T17:00:00.000", count: 2}], third: [{timestamp: "2018-12-09T18:00:00.000", count: 2}]}
const object2 = {first: [{timestamp: "2018-12-09T16:00:00.000", count: 0}], second: [{timestamp: "2018-12-09T17:00:00.000", count: 0}], third: [{timestamp: "2018-12-09T18:00:00.000", count: 3}]}


const result = mergeData(object1, object2)
console.log(result)
<script src="https://cdn.jsdelivr.net/npm/[email protected]/lodash.min.js"></script>

一些例子：

// example 1
const object1 = {
  first: [{timestamp: "2018-12-09T16:00:00.000", count: 3}, {timestamp: "2018-12-09T16:30:00.000", count: 5}], 
  second: [{timestamp: "2018-12-09T17:00:00.000", count: 2}], 
  third: [{timestamp: "2018-12-09T18:00:00.000", count: 2}]
}
const object2 = {
  first: [{timestamp: "2018-12-09T16:00:00.000", count: 0}, {timestamp: "2018-12-09T16:30:00.000", count: 0}], 
  second: [{timestamp: "2018-12-09T17:00:00.000", count: 0}], 
  third: [{timestamp: "2018-12-09T18:00:00.000", count: 3}]
}

const result = {
  first: [{timestamp: "2018-12-09T16:00:00.000", count: 3}, {timestamp: "2018-12-09T16:30:00.000", count: 5}], 
  second: [{timestamp: "2018-12-09T17:00:00.000", count: 2}], 
  third: [{timestamp: "2018-12-09T18:00:00.000", count: 5}]
}


// example 2
const object1 = {
  first: [{timestamp: "2018-12-09T16:00:00.000", count: 3}, {timestamp: "2018-12-09T16:30:00.000", count: 5}], 
  second: [{timestamp: "2018-12-09T17:00:00.000", count: 2}], 
  third: [{timestamp: "2018-12-09T18:00:00.000", count: 2}]
}
const object2 = {
  first: [{timestamp: "2018-12-09T16:00:00.000", count: 0}], 
  second: [{timestamp: "2018-12-09T17:00:00.000", count: 0}], 
  third: [{timestamp: "2018-12-09T18:00:00.000", count: 3}]
}

const result = {
  first: [{timestamp: "2018-12-09T16:00:00.000", count: 3}, {timestamp: "2018-12-09T16:30:00.000", count: 5}], 
  second: [{timestamp: "2018-12-09T17:00:00.000", count: 2}], 
  third: [{timestamp: "2018-12-09T18:00:00.000", count: 5}]
}


// example 3
const object1 = {
  first: [{timestamp: "2018-12-09T16:00:00.000", count: 3}, {timestamp: "2018-12-09T16:30:00.000", count: 5}], 
  second: [{timestamp: "2018-12-09T17:00:00.000", count: 2}], 
  third: [{timestamp: "2018-12-09T18:00:00.000", count: 2}]
}
const object2 = {
  second: [{timestamp: "2018-12-09T17:00:00.000", count: 0}], 
  third: [{timestamp: "2018-12-09T18:00:00.000", count: 3}]
}

const result = {
  first: [{timestamp: "2018-12-09T16:00:00.000", count: 3}, {timestamp: "2018-12-09T16:30:00.000", count: 5}], 
  second: [{timestamp: "2018-12-09T17:00:00.000", count: 2}], 
  third: [{timestamp: "2018-12-09T18:00:00.000", count: 5}]
}


// example 4
const object1 = {
  first: [{timestamp: "2018-12-09T16:00:00.000", count: 3}, {timestamp: "2018-12-09T16:30:00.000", count: 5}], 
  second: [{timestamp: "2018-12-09T17:00:00.000", count: 2}, {timestamp: "2018-12-09T17:30:00.000", count: 20}, {timestamp: "2018-12-09T18:00:00.000", count: 10}], 
  third: [{timestamp: "2018-12-09T18:00:00.000", count: 2}]
}
const object2 = {
  first: [{timestamp: "2018-12-09T16:00:00.000", count: 0}, {timestamp: "2018-12-09T16:30:00.000", count: 0}], 
  second: [{timestamp: "2018-12-09T17:00:00.000", count: 0}, {timestamp: "2018-12-09T17:30:00.000", count: 6}, {timestamp: "2018-12-09T18:00:00.000", count: 2}], 
  third: [{timestamp: "2018-12-09T18:00:00.000", count: 3}]
}

const result = {
  first: [{timestamp: "2018-12-09T16:00:00.000", count: 3}, {timestamp: "2018-12-09T16:30:00.000", count: 5}], 
  second: [{timestamp: "2018-12-09T17:00:00.000", count: 2}, {timestamp: "2018-12-09T17:30:00.000", count: 26}, {timestamp: "2018-12-09T18:00:00.000", count: 12}], 
  third: [{timestamp: "2018-12-09T18:00:00.000", count: 5}]
}
或Drori

Lodash的_.mergeWith()回调将键作为第三个参数。您可以使用它来决定如何合并项目：

const object1 = {first: [{timestamp: "2018-12-09T16:00:00.000", count: 3}], second: [{timestamp: "2018-12-09T17:00:00.000", count: 2}], third: [{timestamp: "2018-12-09T18:00:00.000", count: 2}]}
const object2 = {first: [{timestamp: "2018-12-09T16:00:00.000", count: 0}], second: [{timestamp: "2018-12-09T17:00:00.000", count: 0}], third: [{timestamp: "2018-12-09T18:00:00.000", count: 3}]}

const mergefn = (...args) =>
  _.mergeWith({}, ...args, (o, s, k) => {
      if(_.eq(k, 'timestamp')) return new Date(s);
      if(_.eq(k, 'count')) return (o || 0) + s;
  });
  
const result = mergefn(object1, object2);

console.log(result);
<script src="https://cdn.jsdelivr.net/npm/[email protected]/lodash.min.js"></script>

本文收集自互联网，转载请注明来源。

如有侵权，请联系 [email protected] 删除。

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