This is familiar to programmers who are used to pointers or references. (Java's `final` does the same thing). To prevent changes to an object's properties, you

This is familiar to programmers who are used to pointers or references. (Java's `final` does the same thing). To prevent changes to an object's properties, you could use `Object.freeze()` instead [1]. NB, this is shallow, so a child object of a frozen object can still have its properties changed. [1]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...