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Javascript – transform the json array item to be flat in js

There is an json array from mongodb database as shown below.

[
    {
        "_id": {
            "fx_capacity_category": "100~300"
        },
        "fx_capacity": 314898.0758
    },
    {
        "_id": {
            "fx_capacity_category": "300~500"
        },
        "fx_capacity": 145033.1
    },
    ...
]

This dataset needed to be transformed to be flat while removing the "_id"

[
    {
        "fx_capacity_category": "300~500"
        "fx_capacity": 145033.1
    },
    ...
]

I know the way of doing this by iterating the array item, and finding the item with ‘_id’ and associated leaf key and transform. But that is not a smart way, wondering any better way, for example using lodash.

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2

Answers


  1. 0

    You could remove _id and build a new object with rest and destructured object.

    const
    data = [{ _id: { fx_capacity_category: "100~300" }, fx_capacity: 314898.0758 }, { _id: { fx_capacity_category: "300~500" }, fx_capacity: 145033.1 }],
    result = data.map(({ _id, ...rest }) => ({ ...rest, ..._id }));

console.log(result);
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  2. 0

    You could use flatMap

    data.flatMap((i) => {
  delete i._id; 
  return i; 
})
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