Apart from [the equivalent of] records, I see nothing big.
Except...
this '''let! a = fetchA() and! b = fetchB()''' really puzzles me. Does C# have a high-level syntax for concurrency timing? [something that Java is strongly lacking, and that Typescript did solve with Promise.all(), which is an ugly syntax, from my perspective]
The inlining and escape analysis changes are fairly big from a performance perspective.
Also, C# doesn't need nearly as many massive changes like project Valhalla because they got a lot of those design choices right from day 1 (mostly by looking at what Java did that was dumb and avoiding it).
As others point out, that's F#, but yes C# has `async`/`await`, and has all the `Promise` methods, just under the `Task` class instead (and with slightly different names/calling conventions through out).
Apart from [the equivalent of] records, I see nothing big.
Except...
this '''let! a = fetchA() and! b = fetchB()''' really puzzles me. Does C# have a high-level syntax for concurrency timing? [something that Java is strongly lacking, and that Typescript did solve with Promise.all(), which is an ugly syntax, from my perspective]
Any elaboration on this is very welcome.
The inlining and escape analysis changes are fairly big from a performance perspective.
Also, C# doesn't need nearly as many massive changes like project Valhalla because they got a lot of those design choices right from day 1 (mostly by looking at what Java did that was dumb and avoiding it).
Here `a` and `b` can have different types:
Whereas `Promise.all` usually requires all promises to have the same type (returning a `List<T>` or even a `List<obj>`) .
See https://learn.microsoft.com/en-us/dotnet/fsharp/whats-new/fs...
Actually, TypeScript's `Promise.all` can handle different types too.
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The code snippet is in F#. And F# has so called "computation expressions".
Java has had CompletableFuture::allOf for a long time. The new structured concurrency api also has the same capabilities of waiting for futures.
As others point out, that's F#, but yes C# has `async`/`await`, and has all the `Promise` methods, just under the `Task` class instead (and with slightly different names/calling conventions through out).
I think thats F# not C#