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It's hilarious that the Observable pattern that MVC and Qt are organized around has become "a game-changer for large applications where context is used to distribute state across many components" this year. MVC is maybe 50 years old now?

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There’s a difference, see https://www.builder.io/blog/signals-vs-observables

Thanks! But what's being described there as "observable" is something other than the Observer pattern that "observable" comes from, which is closer to what it calls "signals". https://en.wikipedia.org/wiki/Observer_pattern

I think they are the same, Observable or Observer pattern both require a manual subscription, and publishing is done through a callback offering the latest in a stream of values.

See https://github.com/tc39/proposal-signals?tab=readme-ov-file#... for more on how signals differ. Mainly no manual bookkeeping and the signal is kind of like a handle, and it allows lazy/computed signals that reference other signals and do the change tracking

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