How to add a property to an object's property that is dynamically named

Question

var aaa = new Object;
var bbb = 2;
var ccc = 5;
aaa[bbb].description = differentObject.ccc.description;

console.log(aaa.bbb.description);  //will report "undefined"

what I need, is to create a property "description" for each new value of bbb and assign a value to it inside the object aaa. (in my code, this, except the declaration of aaa) runs in a loop and bbb, ccc values change with each cycle).

Axnyff · Accepted Answer · 2020-07-15 17:34:15Z

1

a.b is equivalent to a["b"] so when you're doing aaa.bbb you're not doing anything related to the bbb variable.

aaa[bbb].description this is correct to set a property on aaa[bbb], however, aaa[bbb] needs to be an object.

An easier way do to this would be:

var aaa = {};
var bbb = 2;
var ccc = 5;
aaa[bbb] = {description: differentObject[ccc].description};

edited Jul 15, 2020 at 17:34

answered Jul 15, 2020 at 17:10

Axnyff

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