Customizing Object Equality for JavaScript Set

JavaScript's Set object, introduced in ES6, employs an equality algorithm analogous to the === operator. However, this approach falls short when comparing complex objects.

To achieve deep object comparison for Set objects, there is currently no straightforward solution available in JavaScript. The Set's internal mechanisms for adding, deleting, and checking for existence rely solely on object references or primitive value comparisons.

Consequently, any attempt to customize object equality would require overriding the core methods of Set, such as .has(), .add(), and .delete(). This would introduce overhead and performance implications due to the necessity of iterative comparisons through the entire Set for each operation.

Proposals have emerged to address this limitation by introducing specialized data structures in JavaScript, such as Records and Tuples. These constructs are designed to be immutable and comparable by value rather than object reference. If implemented, Maps and Sets could leverage these structures to achieve deep object comparisons.

While such proposals may offer a promising solution in the future, they are currently not part of the standard JavaScript specification. As a result, customizability of object equality for Set objects remains a challenge in JavaScript.