5 ms·

Scala-js v0.3 released

68 points by iamtechaddict 13y ago

brandonbloom 13y ago
The title mentions Futures & Promises, but the link is directly to the GitHub project without any further information about those concurrency constructs. I'm curious if they managed to implement the blocking operations of Future [1], such as the "result" method. And, if so, did they accomplish that using the same Continuation Passing Style transform that Scala's Delimited Continuations [2] plugin uses, or some other means? [1]: http://www.scala-lang.org/files/archive/nightly/docs/library/index.html#scala.concurrent.Future http://www.scala-lang.org/files/archive/nightly/docs/library... [2]: http://www.scala-lang.org/api/current/index.html#scala.util.continuations.package http://www.scala-lang.org/api/current/index.html#scala.util....
- lihaoyi 13y ago
  It uses normal Scala `Future`s. You get two `ExecutionContext`s: `queued` and `runNow`. You can't block on a `Future`. That covers just about all the ScalaJS specific stuff, the rest is plain Scala. Take a look at [Scala.Rx](https://github.com/lihaoyi/scala.rx https://github.com/lihaoyi/scala.rx) or [uTest](https://github.com/lihaoyi/utest https://github.com/lihaoyi/utest) if you want to see code examples of how `Future`s are used in ScalaJS, but I think you'll be disappointed: it's exactly the same code that gets run on Scala-JVM!
  - brandonbloom 13y ago
    You said: > You can't block on a `Future` Which answers my question. Thank you. But then you also said: > it's exactly the same code that gets run on Scala-JVM That can't be exactly true, since "Awaitable" [1] doesn't appear anywhere in the scala-js codebase. So I guess as long as you don't mention that trait by name, or attempt to block on a future, then your effectively duck-typed Scala-JVM code will be able to run unmodified on Scala-JS. [1]: http://www.scala-lang.org/files/archive/nightly/docs/library/index.html#scala.concurrent.Awaitable http://www.scala-lang.org/files/archive/nightly/docs/library...
saryant 13y ago
Scala-JS has been making very fast progress lately, the 0.1 release wasn't that long ago. I'm excited to see where it goes and I think there's room for some very cool integrations with Play.
- iamtechaddict 13y ago
  akka (Actor System) too, sjrd is working on it
  - thescrewdriver 13y ago
    Akka code written in Scala compiling to Javascript??
    - adil_h 13y ago
      I think this is it https://github.com/sjrd/scala-js-actors https://github.com/sjrd/scala-js-actors
    - deleted 13y ago
      [deleted]
- wiradikusuma 13y ago
  With no intention of downplaying it, but I think the biggest "blocker" is the resulting file size, making it unfeasible for production.
  - smrtinsert 13y ago
    Doesn't advanced compilation cover that case?
  - gmt2027 13y ago
    The "Hello World" example is over 80Mb after compilation.
    - 13y ago

68 points by iamtechaddict 13y ago

The title mentions Futures & Promises, but the link is directly to the GitHub project without any further information about those concurrency constructs. I'm curious if they managed to implement the blocking operations of Future [1], such as the "result" method. And, if so, did they accomplish that using the same Continuation Passing Style transform that Scala's Delimited Continuations [2] plugin uses, or some other means? [1]: http://www.scala-lang.org/files/archive/nightly/docs/library/index.html#scala.concurrent.Future http://www.scala-lang.org/files/archive/nightly/docs/library... [2]: http://www.scala-lang.org/api/current/index.html#scala.util.continuations.package http://www.scala-lang.org/api/current/index.html#scala.util....

lihaoyi 13y ago
It uses normal Scala `Future`s. You get two `ExecutionContext`s: `queued` and `runNow`. You can't block on a `Future`. That covers just about all the ScalaJS specific stuff, the rest is plain Scala. Take a look at [Scala.Rx](https://github.com/lihaoyi/scala.rx https://github.com/lihaoyi/scala.rx) or [uTest](https://github.com/lihaoyi/utest https://github.com/lihaoyi/utest) if you want to see code examples of how `Future`s are used in ScalaJS, but I think you'll be disappointed: it's exactly the same code that gets run on Scala-JVM!
- brandonbloom 13y ago
  You said: > You can't block on a `Future` Which answers my question. Thank you. But then you also said: > it's exactly the same code that gets run on Scala-JVM That can't be exactly true, since "Awaitable" [1] doesn't appear anywhere in the scala-js codebase. So I guess as long as you don't mention that trait by name, or attempt to block on a future, then your effectively duck-typed Scala-JVM code will be able to run unmodified on Scala-JS. [1]: http://www.scala-lang.org/files/archive/nightly/docs/library/index.html#scala.concurrent.Awaitable http://www.scala-lang.org/files/archive/nightly/docs/library...

saryant 13y ago

Scala-JS has been making very fast progress lately, the 0.1 release wasn't that long ago. I'm excited to see where it goes and I think there's room for some very cool integrations with Play.

iamtechaddict 13y ago
akka (Actor System) too, sjrd is working on it
- thescrewdriver 13y ago
  Akka code written in Scala compiling to Javascript??
  - adil_h 13y ago
    I think this is it https://github.com/sjrd/scala-js-actors https://github.com/sjrd/scala-js-actors
  - deleted 13y ago
    [deleted]
wiradikusuma 13y ago
With no intention of downplaying it, but I think the biggest "blocker" is the resulting file size, making it unfeasible for production.
- smrtinsert 13y ago
  Doesn't advanced compilation cover that case?
- gmt2027 13y ago
  The "Hello World" example is over 80Mb after compilation.
  - 13y ago