[wjmao88]

Hi Dan, this is great and I really like this. But, I think what made me appreciate this is mostly your algebraic effects blog post. My issue with the examples in the reactjs doc pages is that it compares a naive and (intentionally)buggy implementation to a working implementation, so to evaluate the benefits I have to mentally fix the buggy version with existing react and compare that to the working version. It would be easier to see the difference if it could have a working implementation with current react to compare to the implementation with concurrent react.

Also, I'd love to read something about why throwing promises was chosen over other possibilities.

[danabramov]

There is more than one way to fix the buggy versions, so if we compared with a particular non-buggy version, people would complain we didn’t compare with their preferred fix. But that’s fair feedback.

Regardless of the comparison, the features described on the “Concurrent UI Patterns” as the real deal. The “old” ways of doing things don’t allow to do any of them as expressively.