How to modify and object

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1

I have an object and I wand to add more data to it.

Original object:

{type:"Fiat", model:"500", color:"white"};

New object: Added a boolean and a string

{type:"Fiat", model:"500", color:"white", used: false, plate:"ABC123" };

I can’t rebuild the object be cause I don’t know which data I’m getting to I’m just adding extra data.

I also need to substract data from the object.

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