'How add new object property while updating state in React

Basically I want to add a new property id to the state object which is formData I tried the way below mention but its not working

structure of formData object

{
Fname : Tony
Lname : Stark
}

I want to Add Id property to it

{
id : 01
Fname : Tony
Lname : Stark
}

This is what I tried :

let arr = {...formData}
arr.id = 1
setFormData({
    arr
})

reactjs

Solution 1:^[1]

do it like this

setFormData({...formData, id:1})

setFormData({...formData, id: '01'})

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Solution	Source
Solution 1	lawrence arkoh
Solution 2	Myrto Pirli