javascript object freeze

1:freeze only one property of object 

let data={

    name:'raj',

    address:'krishna'

}

Object.defineProperty(data, "address", { configurable: false, writable: false });

data.address='rama'

console.log(data.address)

2:freeze whole object:--

let data={

    name:'raj',

    address:'krishna'

}

Object.freeze(data)