How to convert object into array in Javascript

Question

I have the below object obj(coming as a JSON response):

var obj = {
  0: {
    note: 'test1',
    id: 24759045,
    createTimeStamp: '2022-08-01T17:05:36.750Z',
  },
  1: {
    note: 'test2',
    id: 24759045,
    createTimeStamp: '2022-08-01T17:05:51.755Z',
  },
  note: 'test1',
  id: 24759045,
  createTimeStamp: '2022-08-01T17:05:36.750Z',
};

I only want the objects with numbers("0" , "1" .. so on) to be pushed in an array.

Below is what I am trying to do:

let items = [];
for (var prop in obj) {
  items.push(obj[prop]);
}
console.log(items);

// expected output:

[
  {
    note: 'test1',
    id: 24759045,
    createTimeStamp: '2022-08-01T17:05:36.750Z',
  },
  {
    note: 'test2',
    id: 24759045,
    createTimeStamp: '2022-08-01T17:05:51.755Z',
  },
]

Any pointers would be highly appreciated.

Object.keys(obj).filter((key) => !Number.isNaN(parseInt(key))).map((key) => obj[key])) — dave
– dave, Commented Aug 2, 2022 at 0:07

Benjamin · Accepted Answer · 2022-08-02 00:29:20Z

A few things to consider here.

Are the numeric keys ordered?
Does the order matter?
Are the numeric keys an index of the item in the array?
Are there any gaps in the numeric keys?

First solution, assuming that the numeric keys are the index in the array.

const items = Object.keys(obj).reduce((acc, key) => {
  const index = parseInt(key);
  if (Number.isNaN(index)) {
    return acc;
  }
  acc[index] = obj[key];
  return acc;
}, []);

Second solution, assuming that order matters, but that the numeric keys are not guaranteed to be contiguous.

const items = Object.keys(obj)
  .filter((key) => Number.isNaN(parseInt(key)) === false)
  .sort()
  .map((key) => obj[key]);

Keep in mind that Object.keys does not guarantee that the keys are ordered alpha-numerically. So if order matters, then you have to sort them.

Third solution, if order doesn't matter.

const items = Object.keys(obj)
  .filter((key) => Number.isNaN(parseInt(key)) === false)
  .map((key) => obj[key]);

kavindu.xo · Accepted Answer · 2022-08-02 00:27:10Z

var result = [];

var obj = {
  "0": {
    "note": "test1",
    "id": 24759045,
    "createTimeStamp": "2022-08-01T17:05:36.750Z"
  },
  "1": {
    "note": "test2",
    "id": 24759045,
    "createTimeStamp": "2022-08-01T17:05:51.755Z"
  },
  "note": "test1",
  "id": 24759045,
  "createTimeStamp": "2022-08-01T17:05:36.750Z"
}


for (var i in obj)
  result.push(obj[i]);

$('#result').html(JSON.stringify(result));

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<div id="result"></div>

You can achieve this by doing the following steps.

Copied your object below -->

var obj = {
  "0": {
    "note": "test1",
    "id": 24759045,
    "createTimeStamp": "2022-08-01T17:05:36.750Z"
  },
  "1": {
    "note": "test2",
    "id": 24759045,
    "createTimeStamp": "2022-08-01T17:05:51.755Z"
  },
  "note": "test1",
  "id": 24759045,
  "createTimeStamp": "2022-08-01T17:05:36.750Z"
}

Created new js array -->

var result = [];

Code -->

for (var i in obj)
  result.push(obj[i]);

Find the solution from link below as well --> :) :)

https://jsfiddle.net/kavinduxo/95qnpaed/

dave · Accepted Answer · 2022-08-02 00:07:55Z

-1

I think you'll need to get the keys of the object, filter out the non-numeric ones, then map each key to the obj[key]:

var obj={"0":{"note":"test1","id":24759045,
"createTimeStamp":"2022-08-01T17:05:36.750Z"},"1":{"note":"test2","id":24759045,
"createTimeStamp":"2022-08-01T17:05:51.755Z"},
"note":"test1","id":24759045,"createTimeStamp":"2022-08-01T17:05:36.750Z"};

console.log(
    Object.keys(obj)
          .filter((key) =>!Number.isNaN(parseInt(key)))
          .map((key) => obj[key])
)

answered Aug 2, 2022 at 0:07

dave

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