Javascript：合并具有不同键/值对的数组中的对象，并从相同的键中获取总和

Question

So what I have is an array of objects

[
    {
        "email": "jacob@whatever.com",
        "actionsCount": {
            "edit record": 5,
            "assign to specialist": 1
        },
        "changesTotal": 6
    },
    {
        "email": "trav1@whatever.com",
        "actionsCount": {
            "edit record": 13,
            "duplicate": 5,
            "return for changes": 1
        },
        "changesTotal": 19
    },
    {
        "email": "donbossman@whatever.com",
        "actionsCount": {
            "edit record": 5
        },
        "changesTotal": 5
    },
    {
        "email": "donbossman@whatever.com",
        "actionsCount": {
            "edit record": 11,
            "return for changes": 1,
            "assign to specialist": 1
        },
        "changesTotal": 13
    },
    {
        "email": "Marilla@whatever.com",
        "actionsCount": {
            "edit record": 7
        },
        "changesTotal": 7
    },
    {
        "email": "Marilla@whatever.com",
        "actionsCount": {
            "edit record": 6
        },
        "changesTotal": 6
    },
    {
        "email": "natalie1@whatever.com",
        "actionsCount": {
            "edit record": 5,
            "assign to specialist": 1
        },
        "changesTotal": 6
    },
    {
        "email": "natalie1@whatever.com",
        "actionsCount": {
            "assign to specialist": 2,
            "edit record": 17
        },
        "changesTotal": 19
    },
    {
        "email": "psteacher@whatever.com",
        "actionsCount": {
            "edit record": 2,
            "assign to specialist": 2
        },
        "changesTotal": 4
    },
    {
        "email": "psteacher@whatever.com",
        "actionsCount": {
            "edit record": 17,
            "duplicate": 2
        },
        "changesTotal": 19
    }
]

As you can see there will be multiple entries under the same email, these correspond to each month that user did some actions, as such new entries will populate each month, some most of them by the same users. I don't know all of the actions, but I can be assured that the actions will all be spelled the same. The data is old so as you can see someone used spaces for the key which is another task for another day.

I want to combine objects by the same email, then sum the same actions across the months, and add actions that are present in one month but not another.

So as an example donbossman@whatever.com end result would look like

Would look like

[{
  "email": "donbossman@whatever.com",
  "actionsCount": {
      "edit record": 16,
      "return for changes": 1,
      "assign to specialist": 1
  }
  "changesTotal": 18
}]

So because edit record is present in both occurrences of actionsCount they are simply added up, and return for changes and assign to specialist are present in one but not the other

Right now I feel like I'm close to what I'm trying to achieve? My current approach is as follows

tier2CollectorsActions.reduce((acc, {email, actionsCount}) => {
          acc[email] ??= {email: email, actionsCount: []};
          if(Array.isArray(actionsCount))
            acc[email].actionsCount = _.merge(acc[email].actionsCount, actionsCount)
          else
            acc[email].actionsCount.push(actionsCount);
          return acc;
        }, {})

Which gives me back

{
    "email": "natalie1@whatever.com",
    "actionsCount": [
        {
            "edit record": 5,
            "assign to specialist": 1
        },
        {
            "assign to specialist": 2,
            "edit record": 17
        }
    ]
}

As you can see each actionsCount array corresponds to the two separate natalie1@whatever.com object's actionsCount data. I need the actionsCount data back not as an array but an object, I'm doing it as an array in the example bc its so far been the only way I can get the data from both actionCounts . I've been trying to use Object.value and reduce but I haven't quite gotten yet but I feel like I'm so close.

Any direction/tips/suggestions would be much appreciated

Answer 1

You were close.

1. Seems like actionsCount is always an object, never an array
2. Just add the things to the object

 const data = [{ "email": "jacob@whatever.com", "actionsCount": { "edit record": 5, "assign to specialist": 1 }, "changesTotal": 6 }, { "email": "trav1@whatever.com", "actionsCount": { "edit record": 13, "duplicate": 5, "return for changes": 1 }, "changesTotal": 19 }, { "email": "donbossman@whatever.com", "actionsCount": { "edit record": 5 }, "changesTotal": 5 }, { "email": "donbossman@whatever.com", "actionsCount": { "edit record": 11, "return for changes": 1, "assign to specialist": 1 }, "changesTotal": 13 }, { "email": "Marilla@whatever.com", "actionsCount": { "edit record": 7 }, "changesTotal": 7 }, { "email": "Marilla@whatever.com", "actionsCount": { "edit record": 6 }, "changesTotal": 6 }, { "email": "natalie1@whatever.com", "actionsCount": { "edit record": 5, "assign to specialist": 1 }, "changesTotal": 6 }, { "email": "natalie1@whatever.com", "actionsCount": { "assign to specialist": 2, "edit record": 17 }, "changesTotal": 19 }, { "email": "psteacher@whatever.com", "actionsCount": { "edit record": 2, "assign to specialist": 2 }, "changesTotal": 4 }, { "email": "psteacher@whatever.com", "actionsCount": { "edit record": 17, "duplicate": 2 }, "changesTotal": 19 } ] const result = data.reduce((acc, { email, actionsCount, changesTotal }) => { acc[email]??= { email: email, actionsCount: {}, changesTotal: 0 }; Object.entries(actionsCount).forEach(([key, value]) => { acc[email].actionsCount[key]??= 0 acc[email].actionsCount[key] += value }) acc[email].changesTotal += changesTotal return acc; }, {}) console.log(result)

Answer 2

Use lodash's _.groupBy() to group the items by email, and then map the groups and merge them using _.mergeWith() . In the customizer function of _.mergeWith() check if either of the values is a number (since one of them might be undefined ), and if they are numbers sum them. If not, let _.mergeWith() handle them by return undefined :

 const { flow, groupBy, map, mergeWith, isNumber } = _ const fn = flow( arr => groupBy(arr, 'email'), groups => map(groups, items => mergeWith(...items, (o1, o2) => isNumber(o1) || isNumber(o2)? (o1?? 0) + (o2?? 0): undefined )) ) const arr = [{"email":"jacob@whatever.com","actionsCount":{"edit record":5,"assign to specialist":1},"changesTotal":6},{"email":"trav1@whatever.com","actionsCount":{"edit record":13,"duplicate":5,"return for changes":1},"changesTotal":19},{"email":"donbossman@whatever.com","actionsCount":{"edit record":5},"changesTotal":5},{"email":"donbossman@whatever.com","actionsCount":{"edit record":11,"return for changes":1,"assign to specialist":1},"changesTotal":13},{"email":"Marilla@whatever.com","actionsCount":{"edit record":7},"changesTotal":7},{"email":"Marilla@whatever.com","actionsCount":{"edit record":6},"changesTotal":6},{"email":"natalie1@whatever.com","actionsCount":{"edit record":5,"assign to specialist":1},"changesTotal":6},{"email":"natalie1@whatever.com","actionsCount":{"assign to specialist":2,"edit record":17},"changesTotal":19},{"email":"psteacher@whatever.com","actionsCount":{"edit record":2,"assign to specialist":2},"changesTotal":4},{"email":"psteacher@whatever.com","actionsCount":{"edit record":17,"duplicate":2},"changesTotal":19}] const result = fn(arr) console.log(result)

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Answer 3

You shouldn't initialize actionsCount to an array. That's causing it to push each actionsCount object onto the array, instead of combining the properties.

You need to loop over the properties in actionsCount , adding them to the corresponding value in acc[email] .

 const tier2CollectorsActions = [{ "email": "jacob@whatever.com", "actionsCount": { "edit record": 5, "assign to specialist": 1 }, "changesTotal": 6 }, { "email": "trav1@whatever.com", "actionsCount": { "edit record": 13, "duplicate": 5, "return for changes": 1 }, "changesTotal": 19 }, { "email": "donbossman@whatever.com", "actionsCount": { "edit record": 5 }, "changesTotal": 5 }, { "email": "donbossman@whatever.com", "actionsCount": { "edit record": 11, "return for changes": 1, "assign to specialist": 1 }, "changesTotal": 13 }, { "email": "Marilla@whatever.com", "actionsCount": { "edit record": 7 }, "changesTotal": 7 }, { "email": "Marilla@whatever.com", "actionsCount": { "edit record": 6 }, "changesTotal": 6 }, { "email": "natalie1@whatever.com", "actionsCount": { "edit record": 5, "assign to specialist": 1 }, "changesTotal": 6 }, { "email": "natalie1@whatever.com", "actionsCount": { "assign to specialist": 2, "edit record": 17 }, "changesTotal": 19 }, { "email": "psteacher@whatever.com", "actionsCount": { "edit record": 2, "assign to specialist": 2 }, "changesTotal": 4 }, { "email": "psteacher@whatever.com", "actionsCount": { "edit record": 17, "duplicate": 2 }, "changesTotal": 19 } ]; const result = tier2CollectorsActions.reduce((acc, { email, actionsCount }) => { acc[email]??= { email: email, actionsCount: {} }; Object.entries(actionsCount).forEach(([key, value]) => { acc[email].actionsCount[key] = (acc[email].actionsCount[key] || 0) + value; }); return acc; }, {}) console.log(result);