proposal-set-methods VS proposal-record-tuple

There is a proposal to add methods like union and intersection to JavaScript's built-in Set class.

Set Methods: New Set methods

This article seems to be largely fluff. Here's a link to the proposal with the list of methods being added: https://github.com/tc39/proposal-set-methods?tab=readme-ov-f...

So, 7 new Set methods are under construction now and I will show you the way they interact with data:

They're stage 3, but we're getting new methods just for this sort of stuff. You'd be able to do:

Coming soon: https://github.com/tc39/proposal-set-methods

I'm excited for that one :). They are also coming out with intersection, but only for sets.

it's highly incompatible with Set helper methods (a stage 3 proposal)

relevant issue, which is at the crux of this problem: https://github.com/tc39/proposal-record-tuple/issues/387

There are still so many basic things that aren't in the JS stdlib, though. A good example is Map - if you need to use a tuple of two values as a key, you're SOL because there's no way to customize key comparisons. Hopefully we'll get https://tc39.es/proposal-record-tuple/ eventually, but meanwhile languages ranging from C++ to Java to Python have had some sensible way to do this for over 20 years now.

If you’re reaching for structuredClone, what you really want is native immutable Record and Tuple syntax, and the companion “deep path properties” syntax which allows for efficient and ergonomic immutable updates:

- https://github.com/tc39/proposal-record-tuple

It will be called "record" in JavaScript which will swing the popularity back the other way I guess (currently a language proposal)

I suspect considering the strong desire to maintain consistency with JavaScript, we will eventually see something that when the Record proposal passes through tc39

I hope the Record and Tuple proposal makes it through

I mean, I'd love some real immutable/persistent data structures in JS by default, or even some Immer-like syntax sugar. Something like the record/tuple proposal would be awesome.

This will become very useful once Records and Tuples are a thing, because it allows you to store object references in a record/tuple (which by definition can only contain primitives).

Record and tuple is at stage 2

Also, js has an ongoing immutable value data types proposal.