let user={
    name:"heman"
};
Object.defineProperty(user, "name",{
    configurable:false
});
try{
    Object.defineProperty(user, "name",{
    configurable:true
    })
}//Throws error
catch(err){console.log(err)}
try{
    Object.defineProperty(user, "name",{
    enumerable:false
    });
} //Throws Error
catch(err){console.log(err)}

try{
    Object.defineProperty(user, "name", {
    writable:false
    });
} //Does'nt Throws Error
catch(err){console.log(err)}