Can a Set (or Map) be held in a "frozen" state?

Despite the fact that Set is an Object, Object.freeze() specifically operates on the properties of the object, a feature not utilized by Map and Set: for example

let m = new Map();
Object.freeze(m);
m.set('key', 55);
m.get('key'); // ==> 55

This behavior can be observed in Chrome, and it is likely standardized across browsers.

I am aware that it is possible to (occasionally) convert the Set or Map into a regular Object, and then freeze that object. However, this may lead to changes in key access between the frozen and unfrozen versions.

javascriptobjectdictionaryset

Answer №1

This question poses an interesting challenge, as it appears that directly restricting certain methods on a Set or Map object is not currently supported.

Here are a couple of potential solutions inspired by the functionality of the Set object:

  1. One approach could involve creating a proxy object that limits access to specific methods such as .add(), .clear(), and .delete(), while allowing read-only access to other methods. By using this proxy, direct manipulation of the original Set object would be obscured.

  2. Another method might entail overriding the functionalities of .add(), .clear(), and .delete() within a particular Set instance with functions that either do nothing or raise an exception when called. To prevent these override functions from being changed back, they could be made non-configurable and then the object could be frozen. However, it's important to note that accessing the original Set object via Set.prototype.add could still bypass these restrictions.

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