CODEWITHSUNDEEP
javascriptobject
Thalya Flourishing
Thalya Flourishing

Reputation: 1

JavaScript: Is it possible to edit existing key names?

Using JavaScript, is it possible to change an existing key name in an object, other than by removing the entire key-value pair and adding a new one in its place?

The sort of thing about which I am asking would, if possible, look generally like this:

myObj = {'a':1, 'b':2,}; 

Object.keys(myObj)[i] = 'newKeyName';

...except that instead of editing an array made by extracting the key names, one would actually edit the key name itself in the source object.

Upvotes: 0

Views: 66

Answers (2)

Vishnu J
Vishnu J

Reputation: 491

Another solution with some perf.

obj = {'a':1,'b':2}
oldKey = 'a'
newKey = 'x'

if (oldKey !== newKey) {
    Object.defineProperty(obj, newKey,
        Object.getOwnPropertyDescriptor(obj, oldKey));
    delete obj[oldKey];
}

Upvotes: 0

Matt Mokary
Matt Mokary

Reputation: 727

Nope, that's the best way to do it.

var a = { b: 'c', d: 'e' };

a.f = a.b;
delete a.b;

console.log(a);  // { d: 'e', f: 'c' }

Upvotes: 3

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