How to manipulate a collection in Javascript?

Question

I am trying to get an object from another javascript object. I have written the following code to group:

function execute(args) {
  const networkHospitals = args[0];
  cummulatedArray = _.groupBy(networkHospitals, "cityName");
  console.log(cummulatedArray);
}

Here's the sample output that I get from the above code:

{
  Trichy: [
    {
      hospitalName: 'asd',
      address_1: 'Friday',
    }
  ]
}

But I want to return the data in this format:

{
  "key": "Tirchy",
  "value": [{
    "hospitalName": "asd",
    "address_1": "Friday"
  }],
}

Here's the input data:

"networkHospitals": 
[{
  "hospitalName": "abc",
  "address_1": "Friday",
  "cityName": "Trichy"
}],

I would be really grateful, if you can guide me how to manipulate this JSON data that I am getting.

Answer 1

After grouping by cityName, map the groups, and create an object for each group. If needed map the values, and omit the cityName property from each object.

const networkHospitals = [{"hospitalName":"abc","address_1":"Friday","cityName":"Trichy"}]

const result = _.map(
  _.groupBy(networkHospitals, 'cityName'),
  (val, key) => ({
    key,
    value: val.map(o => _.omit(o, 'cityName'))
  })
)

console.log(result)

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