Inserting property in JSON object at a specific position

Question

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Does JavaScript Guarantee Object Property Order?

I would like to know how I can insert a JSON object property at a specific position? Let's assume this Javascript object:

var data = {
  0: 'lorem',
  1: 'dolor sit',
  2: 'consectetuer'
}

I have an ID and a string, like:

var id = 6;
var str = 'adipiscing';

Now, I would like to insert the id between 0 and 1 (for example) and it should be like:

data = {
  0: 'lorem',
  6: 'adipiscing',
  1: 'dolor sit',
  2: 'consectetuer'
}

How can I do this? Is there any jQuery solution for this?

I don't think the ECMAScript spec says that object properties must keep any order. — Álvaro González, Nov 21 '12 at 15:03
You can't. JavaScript's object properties do not have a deterministic order. — Michael Berkowski, Nov 21 '12 at 15:03
If you need deterministic order of numeric indices, you ought to be using an `Array` `[]` instead. — Michael Berkowski, Nov 21 '12 at 15:05
Why do you want to so this? to access the string, you'd have to use `data[i]`, where `i` is your id. The order doesn't matter at all, there. — Cerbrus, Nov 21 '12 at 15:05
I think if you NEED the have an object's properties in specific order then there might be a flaw in your design. — frenchie, Nov 21 '12 at 15:10

Cerbrus · Answer 1 · 2012-11-21T15:13:41.977

9

To specify an order in which elements of an object are placed, you'll need to use an array of objects, like this:

data = [
    {0: 'lorem'},
    {1: 'dolor sit'},
    {2: 'consectetuer'}
]

You can then push a element to a certain position in the array:

// Push {6: 'adipiscing'} to position 1
data.splice(1, 0, {6: 'adipiscing'})

// Result:
data = [
    {0: 'lorem'},
    {6: 'adipiscing'},
    {1: 'dolor sit'},
    {2: 'consectetuer'}
]
// Access it:
data[0][0] //"lorem"

However, this will render the indices you've specified ({0:) pretty much useless.

edited Nov 21 '12 at 15:13

answered Nov 21 '12 at 15:08

Cerbrus

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The problem is that here you used an array instead of the object – gildniy Jan 12 '20 at 19:40
The problem is that objects in JavaScript don't support ordered iteration, the OP's data structure is weird, and this question is from ***2012***. It's hella' old! – Cerbrus Jan 26 '21 at 08:20

Inserting property in JSON object at a specific position

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