7 ms·

Introducing the Go Playground

76 points by enneff 16y ago

fictorial 16y ago
I am more interested in the server-side sandbox. There are a few like codepad, SPOJ but not many that with source available.
- kranner 16y ago
  > not many that with source available. Do you know of any that do come with source? I'd love to have a look. http://codepad.org/about http://codepad.org/about has a useful 'Paranoia' section: it was the starting point for me to build my own code-judging service. I couldn't find anything else at the time. edit: codepad cites geordi: http://www.xs4all.nl/~weegen/eelis/geordi/ http://www.xs4all.nl/~weegen/eelis/geordi/ That's non-standard C++ so it might not be immediately useful, but I managed to find some nice info in the source on which system calls to consider dangerous.
  - _delirium 16y ago
    http://hackage.haskell.org/package/mueval http://hackage.haskell.org/package/mueval is a Haskell one, used by http://tryhaskell.org/ http://tryhaskell.org/
    - kranner 16y ago
      Thanks.
fauigerzigerk 16y ago
I would love to see Go on GAE, and yes I generally love to make obvious statements that have been made countless times before ;-)
- Chickencha 16y ago
  There's an issue in the issue tracker for it that you can star if you haven't already: http://code.google.com/p/googleappengine/issues/detail?id=2382 http://code.google.com/p/googleappengine/issues/detail?id=23... It might not make a difference, but it can't hurt.
sgt 16y ago
What is the point of Go? What niche does it fill? Is it easy to start working with Go and integrate existing C libraries with it?
- enneff 16y ago
  We initially called Go a "systems language," because we wanted to use it to build systems software. What we mean by that is high-performance networked programs that run on multicore machines. The kind of server stuff people traditionally use C or C++ for. Since Go's release last November, we've seen interest in Go from a lot of different places. There was the high-performance computing crowd that we were targeting, but beyond that we saw a lot of users of interpreted languages who craved more speed with the same ease-of-use. We're yet to see which major niche Go fills, if any. There's a growing community of people from different backgrounds using it, and they seem to enjoy it. I personally think it's a lovely language to write all kinds of code in. I recently rewrote our continuous build client in Go, and I found it a cinch to write it in clear, reliable, maintainable way. It's definitely worth checking Go out because, even though it ticks a lot of the same boxes as existing languages, it's quite different from anything else out there in many subtle ways. Certainly for writing server daemons it totally kicks ass. It's easy to get started. The standard library is featureful (http://golang.org/pkg/ http://golang.org/pkg/), and there's a lot of good documentation (http://golang.org/doc/docs.html http://golang.org/doc/docs.html). As for integrating with existing code, Go comes with a tool called cgo (http://golang.org/cmd/cgo/ http://golang.org/cmd/cgo/) which allows you to write Go code that links with C code. It's pretty easy to use, and there are many third party libraries (http://godashboard.appspot.com/project http://godashboard.appspot.com/project) that use it. There's also Go support for SWIG for linking against C++ code.
  - mahmud 16y ago
    Everything that Go has is already in Java. In fact, Go looks like Java with an ActionScript 3.0 syntax. Is there anything going on for it that Java doesn't have, or do better? [Edit: By the way, I keep hearing Go is an excellent language for writing daemons. Why is that? when it doesn't even have anything resembling exception handling, much less a condition system? This is the Go spec: http://golang.org/doc/go_spec.html http://golang.org/doc/go_spec.html ]
kuszi 16y ago
nice feature but Go is available online at http://ideone.com http://ideone.com since several months
- enneff 16y ago
  Ideone is pretty cool, although it seems slower, and the editor doesn't indent. Also, it's running a _really_ old version of Go. (http://ideone.com/spBzw http://ideone.com/spBzw) It's at least 400 revisions out of date. We intend to keep the golang.org Playground up-to-date.
  - kuszi 16y ago
    I like the examples at the Go Playground. Ideone uses gc-2010-07-14 so it seems to be quite ancient but ok - it is not the up to data version, but I really do not get your comment about speed (do you mean the execution time, response time or what?) and the indent feature (It seems to me there is no auto indent feature and the "Tab" key moves you to the examples list).
    - enneff 16y ago
      There's a bug in the interface code for non-Chrome browsers. In Chrome, the tab key works, and the text area auto-indents. It's a small comfort but it makes a world of difference for me. There have been language changes as recently as this week. Go moves fast (although it's unusual for existing code to break).
      - kuszi 16y ago
        > "There's a bug in the interface code for non-Chrome browsers" - thank you for the explanation, now this suggestion is clear.
signa11 16y ago
personally for me, the fact that you can include a "live programming" in the documentation is pretty cool. almost the feel of a "repl" :)
jlgbecom 16y ago
I've been really excited about Go, but I've been stuck in one of those dilemmas where I don't really learn a language until I work on a tangible project with it, and I can't seem to come up with anything I need to write in Go. I'm sure something will surface eventually, and I hope soon, because everything about Go makes me very excited about programming.
KaeseEs 16y ago
Has any headway been made on the issue of generic programming in Go? I haven't heard anything since the discussion on Russ Cox's blog about it a few months ago ( http://research.swtch.com/2009/12/generic-dilemma.html http://research.swtch.com/2009/12/generic-dilemma.html ). It would be very, very interesting if the techniques described by Stepanov in Elements of Programming could be applied in Go without a runtime performance hit or the destruction of Go's fantastic compile times (commenter Rivorus from the blog post seemed to think this was possible, and that even the baroqueness of C++ templates could be avoided). e: Unfortunately I'm too busy with class and work lately to really learn more than a trivial amount of Go, but it's nice to hear news every so often so that I can remain abreast of developments and hopefully not be flat-footed when I do have time to dive in

76 points by enneff 16y ago

I am more interested in the server-side sandbox. There are a few like codepad, SPOJ but not many that with source available.

kranner 16y ago
> not many that with source available. Do you know of any that do come with source? I'd love to have a look. http://codepad.org/about http://codepad.org/about has a useful 'Paranoia' section: it was the starting point for me to build my own code-judging service. I couldn't find anything else at the time. edit: codepad cites geordi: http://www.xs4all.nl/~weegen/eelis/geordi/ http://www.xs4all.nl/~weegen/eelis/geordi/ That's non-standard C++ so it might not be immediately useful, but I managed to find some nice info in the source on which system calls to consider dangerous.
- _delirium 16y ago
  http://hackage.haskell.org/package/mueval http://hackage.haskell.org/package/mueval is a Haskell one, used by http://tryhaskell.org/ http://tryhaskell.org/
  - kranner 16y ago
    Thanks.

fauigerzigerk 16y ago

I would love to see Go on GAE, and yes I generally love to make obvious statements that have been made countless times before ;-)

Chickencha 16y ago
There's an issue in the issue tracker for it that you can star if you haven't already: http://code.google.com/p/googleappengine/issues/detail?id=2382 http://code.google.com/p/googleappengine/issues/detail?id=23... It might not make a difference, but it can't hurt.

sgt 16y ago

What is the point of Go? What niche does it fill? Is it easy to start working with Go and integrate existing C libraries with it?

enneff 16y ago
We initially called Go a "systems language," because we wanted to use it to build systems software. What we mean by that is high-performance networked programs that run on multicore machines. The kind of server stuff people traditionally use C or C++ for. Since Go's release last November, we've seen interest in Go from a lot of different places. There was the high-performance computing crowd that we were targeting, but beyond that we saw a lot of users of interpreted languages who craved more speed with the same ease-of-use. We're yet to see which major niche Go fills, if any. There's a growing community of people from different backgrounds using it, and they seem to enjoy it. I personally think it's a lovely language to write all kinds of code in. I recently rewrote our continuous build client in Go, and I found it a cinch to write it in clear, reliable, maintainable way. It's definitely worth checking Go out because, even though it ticks a lot of the same boxes as existing languages, it's quite different from anything else out there in many subtle ways. Certainly for writing server daemons it totally kicks ass. It's easy to get started. The standard library is featureful (http://golang.org/pkg/ http://golang.org/pkg/), and there's a lot of good documentation (http://golang.org/doc/docs.html http://golang.org/doc/docs.html). As for integrating with existing code, Go comes with a tool called cgo (http://golang.org/cmd/cgo/ http://golang.org/cmd/cgo/) which allows you to write Go code that links with C code. It's pretty easy to use, and there are many third party libraries (http://godashboard.appspot.com/project http://godashboard.appspot.com/project) that use it. There's also Go support for SWIG for linking against C++ code.
- mahmud 16y ago
  Everything that Go has is already in Java. In fact, Go looks like Java with an ActionScript 3.0 syntax. Is there anything going on for it that Java doesn't have, or do better? [Edit: By the way, I keep hearing Go is an excellent language for writing daemons. Why is that? when it doesn't even have anything resembling exception handling, much less a condition system? This is the Go spec: http://golang.org/doc/go_spec.html http://golang.org/doc/go_spec.html ]

kuszi 16y ago

nice feature but Go is available online at http://ideone.com http://ideone.com since several months

enneff 16y ago
Ideone is pretty cool, although it seems slower, and the editor doesn't indent. Also, it's running a _really_ old version of Go. (http://ideone.com/spBzw http://ideone.com/spBzw) It's at least 400 revisions out of date. We intend to keep the golang.org Playground up-to-date.
- kuszi 16y ago
  I like the examples at the Go Playground. Ideone uses gc-2010-07-14 so it seems to be quite ancient but ok - it is not the up to data version, but I really do not get your comment about speed (do you mean the execution time, response time or what?) and the indent feature (It seems to me there is no auto indent feature and the "Tab" key moves you to the examples list).
  - enneff 16y ago
    There's a bug in the interface code for non-Chrome browsers. In Chrome, the tab key works, and the text area auto-indents. It's a small comfort but it makes a world of difference for me. There have been language changes as recently as this week. Go moves fast (although it's unusual for existing code to break).
    - kuszi 16y ago
      > "There's a bug in the interface code for non-Chrome browsers" - thank you for the explanation, now this suggestion is clear.

signa11 16y ago

personally for me, the fact that you can include a "live programming" in the documentation is pretty cool. almost the feel of a "repl" :)

jlgbecom 16y ago

I've been really excited about Go, but I've been stuck in one of those dilemmas where I don't really learn a language until I work on a tangible project with it, and I can't seem to come up with anything I need to write in Go. I'm sure something will surface eventually, and I hope soon, because everything about Go makes me very excited about programming.

KaeseEs 16y ago

Has any headway been made on the issue of generic programming in Go? I haven't heard anything since the discussion on Russ Cox's blog about it a few months ago ( http://research.swtch.com/2009/12/generic-dilemma.html http://research.swtch.com/2009/12/generic-dilemma.html ). It would be very, very interesting if the techniques described by Stepanov in Elements of Programming could be applied in Go without a runtime performance hit or the destruction of Go's fantastic compile times (commenter Rivorus from the blog post seemed to think this was possible, and that even the baroqueness of C++ templates could be avoided). e: Unfortunately I'm too busy with class and work lately to really learn more than a trivial amount of Go, but it's nice to hear news every so often so that I can remain abreast of developments and hopefully not be flat-footed when I do have time to dive in