Filtering nested array of objects by array of strings

Question

Good evening

Wondering if anyone could give me hand, I seem to be going in circles I am trying to get all the objects containing the key/field "type" from an array, by another array of strings.

{
  "someData": [
    {
      "date": "someDate",
      "someNestedData": [
        {
          "id": "1",
          "type": "type1",
          "dateCreated": "someDate"
        },
        {
          "id": "2",
          "type": "type2",
          "dateCreated": "someDate"
        }
      ]
    },
      {
      "date": "someDate",
      "someNestedData": [
        {
          "id": "3",
          "type": "type1",
          "dateCreated": "someDate"
        },
        {
          "id": "4",
          "type": "type4",
          "dateCreated": "someDate"
        }
      ]
    }

  ]
}

and another array of strings const types = ['type1', 'type2]` I am trying to filter out the array so that any object not containing the key in the types array is filtered out.

So the end result would be

{
  "someData": [
    {
      "date": "someDate",
      "someNestedData": [
        {
          "id": "1",
          "type": "type1",
          "dateCreated": "someDate"
        },
        {
          "id": "2",
          "type": "type2",
          "dateCreated": "someDate"
        }
      ]
    },
      {
      "date": "someDate",
      "someNestedData": [
        {
          "id": "3",
          "type": "type1",
          "dateCreated": "someDate"
        },
      ]
    }

  ]
}

I have tried something along the lines of

data.someData.someNestedData.indexOf(function (i) {
  return types.indexOf(i.type);
})

as well as a few other bloated approaches, just not coming right and looking for something quite performant. TIA :)

Alberto · Accepted Answer · 2021-08-22 19:46:31Z

You can do something like this:

const types = ['type1', 'type2'];
const res = [
    {
      "date": "someDate",
      "someNestedData": [
        {
          "id": "1",
          "type": "type1",
          "dateCreated": "someDate"
        },
        {
          "id": "2",
          "type": "type2",
          "dateCreated": "someDate"
        }
      ]
    },
      {
      "date": "someDate",
      "someNestedData": [
        {
          "id": "3",
          "type": "type1",
          "dateCreated": "someDate"
        },
        {
          "id": "4",
          "type": "type4",
          "dateCreated": "someDate"
        }
      ]
    }
]
// map over the array
.map(obj => ({
     // rebuild the object 
     ...obj, 
     // but replace "someNestedData" with the list of element that has the 'type' filed included in types
     someNestedData: obj.someNestedData.filter(
          el => types.includes(el.type)
     )
}))
console.log(res)

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