JavaScript Reorders elements of an Object

Question

Using JavaScript, I am trying to create the following object:

{name: "John Doe", grade: "3", 6: "six"}

Note that the key for the third element is a number, 6.

I am creating the object as follows:

var myObject = {};

// Some code goes here

myObject["name"] = "John Doe";

// Some more code goes here

myObject["grade"] = "3";

// And even more code here

myObject["6"] = "six";

Now, the problem is the object gets constructed as follows

{6: "six", name: "John Doe", grade: "3"}

Note that the element 6: "six" moved to the front of the object even though it was added last.

I noticed that all elements that have numbers as their keys get added to the front even though they get added after other elements. How I ensure that the elements are not re-arranged and keep my original order?

Thanks.

prasanth · Accepted Answer · 2017-09-23T06:07:52.000

0

My simple answer is not possible.And this not a problem.Because object does not have sorting function.It's a default behaviour of the object.And also you calling the object values via key name, not the index.so sorting was not necessary

var a ={6: "six", name: "John Doe", grade: "3"};

console.log(a['6']) // calling by keyname so position not a problem with that

Updated

If you need an order .use with array

var myObject = [];

myObject.push({name : "John Doe"});
myObject.push({grade : "one"});
myObject.push({6 : "six"});

console.log(myObject)

edited Sep 23 '17 at 06:07

answered Sep 23 '17 at 06:01

prasanth

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I understand the purpose of keys/values. But in our case, only in one situation, order IS important. Is there a way of ensuring that? – Greeso Sep 23 '17 at 06:04
if you need a order you need to create Array inside object otherwise you can't able to get the order – prasanth Sep 23 '17 at 06:05
:( ok, thanks for your help – Greeso Sep 23 '17 at 06:05
@Greeso: *"Is there a way of ensuring that?"* No. – Felix Kling Sep 23 '17 at 06:06
@Greeso see my updated answer – prasanth Sep 23 '17 at 06:08
@prasad - Thanks for the suggestion, but was thinking of creating one additional array, an index array, that lists the order of the objects rather than making the object more complex. – Greeso Sep 23 '17 at 06:10
@FelixKling - Thanks you – Greeso Sep 23 '17 at 06:11
@Greeso For my suggestion, no need create the additional array. you have to handle it an even more complex object in future .keep coding :) – prasanth Sep 23 '17 at 06:27
@prasad - According to this https://stackoverflow.com/questions/5525795/does-javascript-guarantee-object-property-order#5525820 I could use `Map` instead of `Object`. I will try it. – Greeso Sep 23 '17 at 06:29

JavaScript Reorders elements of an Object

1 Answers1