Can I rely on the key order of a JavaScript object literal that's never written to?

Asked Mar 14 '19 at 09:05

Active Mar 14 '19 at 10:07

Viewed 36 times

I understand that in JS Object keys aren't guaranteed to be ordered.

However, I find that for object literals the order, after creation, remains equal to the literal unless I add a new key.

Could I rely on the key ordering of an object literal I freeze?

For instance:


const o = Object.freeze({
    a: 1,
    b: 2,
    c: 3
});

What are the conditions under which the order of this object's keys wouldn't be a,b,c?

edited Mar 14 '19 at 10:07

asked Mar 14 '19 at 09:05

In ES6+, keys are guaranteed to be ordered in (1) numeric index order (2) insertion order – CertainPerformance Mar 14 '19 at 09:08
1

I don't know what you are trying to do but it is a pretty bad idea to rely on key order. – Kornflexx Mar 14 '19 at 09:20
CertainPerformance: I understand there are very similar questions, but I don't think the specific thing I'm asking has been asked before on SO. Please reconsider. – Pablo Barría Urenda Mar 14 '19 at 10:08

0 Answers0