How to add a property of existing name to a javascript object

Question

I have a javascript object with the following properties

var a
id : "Something"
value : "Something"

I want to add another property with name id is it possible in javascript?

Answer 1

You can just have an array of ids:

var a = {
  id: ['id1','id2'],
  value: 'something'
}

Answer 2

No, this not possibly. In object keys is unique.