How to add an object.key to an existing array in javascript?

Question

I would like to add a new object.key to my JSON array.

To do that I have defined a new variable var result = {"bad":1} then I'm pushing the items like this skippedData.push(item.metadata["pico:record"]["dc:description"],{result});

As JSON output I'm having:

[
  {
    "skippedData": [
      {
        "_": "Lungo le mura, al posto del baluardo nord-est, la cosiddetta Fortezza medicea è un degradato complesso di corpi di fabbrica eretti nella 2ª metà del '500 attorno al trecentesco cassero senese.",
        "$": {
          "xml:lang": "it"
        }
      },
      {
        "result": {
          "bad": 1
        }
      }
    ]
  }
]

Which is wrong since I'm having a new "result" object instead of a "result" object key.

My expected output should be:


[
  {
    "skippedData": [
      {
        "_": "Lungo le mura, al posto del baluardo nord-est, la cosiddetta Fortezza medicea è un degradato complesso di corpi di fabbrica eretti nella 2ª metà del '500 attorno al trecentesco cassero senese.",
        "$": {
          "xml:lang": "it"
        },
        "result": {
          "bad": 1
        }
      }
    ]
  }
]

What I'm doing wrong?

Regards

skad0 · Accepted Answer · 2019-11-18 11:29:43Z

1

skippedData is an array. You are using push method which is adding elements to array.

As I understood u want to add data from two sources in one object, so u can use this way to build new object there with spread:

skippedData.push({ 
  ...item.metadata["pico:record"]["dc:description"],
  ...{result}
});

or equal with Object.assign

skippedData.push(Object.assign(
  {},
  item.metadata["pico:record"]["dc:description"],
  {result}
));

If u want exactly to modify object already existing in array, u can refer to it by key, e.g.

skippedData[0].result = result

answered Nov 18, 2019 at 11:29

skad0

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