const obj = {
  prop: 42
};
Object.freeze(obj);
obj.prop = 33;
console.log(obj.prop);// 42

      const obj = {
            prop: 42
        };
        obj.aa = 33;
        console.log(obj.aa);// 33
        Object.freeze(obj);
        obj.aa =44;
        console.log(obj.aa);//33

        var arr = [1]
        arr[0] = 33;
        console.log(arr[0]);// 33
        Object.freeze(arr);
        arr[0] = 44;
        console.log(arr[0]);// 33