Adding a key from a variable string (es6) when using spread syntax

Question

I would like to know if there is a clean way to set the value of a key from a string variable when using spread syntax in es6?

Something like the following:

let keyVar = 'newKey'
let newObject = {keyVar:{some:'json'},...oldObject}

But this leads to:

{"keyVar":{"some":"json"}, ... }

rather than:

{"newKey":{"some":"json"}, ... }

FYI, "spread properties" are not part of ES6. They are currently a proposal, i.e. an experimental feature. But it doesn't change how to set the property anyway. It also has nothing to do with JSON. — Felix Kling, Dec 22 '16 at 22:58

score 49 · Accepted Answer · answered Dec 22 '16 at 22:23

49

const keyVar = 'newKey';
const newObject = { [keyVar]: { some: 'json' } };
console.log(newObject);

answered Dec 22 '16 at 22:23

1 Answers1