8 ms·
Try Python, Ruby, Lua, Scheme, QBasic, Forth ...
Everything is open source at http://github.com/replit/
- forbes 15y agoamasad: After a 5 minute play my first impressions are 'awesome!'. Some feedback: I selected QBasic then changed my mind but couldn't immediately figure out how to get back to the list of the languages. Clicking the logo of a website usually takes you back to the 'home page', which in this case I consider to be the list of languages. You have buttons at the top right, with the lambda taking me back to the language chooser. Maybe button labels, even tooltips would help. But I would definitely make the logo the 'home' button. Even refreshing the page didn't take me back. Anyway, a minor complaint. A super-cool effort. I will now go play with it some more.
- amasad 15y agoWe thought the lambda button would be obvious! Will add labels/tooltips soon, thanks.
- forbes 15y agoIt wasn't obvious enough for a half-asleep half-wit (me). But as I said, a very minor complaint. It is a great app you have made.
- rprospero 15y agoI thought that the lambda button would give me a list of available functions in my current language. I'd definitely recommend changing the label to something less ambiguous.
- alttag 15y agoSame comment as the GP. I felt like you're breaking a convention by not having the logo go back to the chooser page, and by not returning to the chooser on refresh/revisit.
- amasad 15y agoWebsite conventions? We think of repl.it as a webapp, not a website. Once you load a language the app remembers your language and loads it for you on next page load, and if you want to change your language you click the language selector button (which I agree is not that clear at the moment).
- zbuc 15y agoThen it should also load the last program you were working on -- and, if possible, the output from the interpreter as well. Cool app!
- max99x 15y agoCurrently you can save a replayable session and get a unique link, but this is public. We do have plans to remember history locally (either just as command history or a full-blown session) in the future. The initial relevant issue is at https://github.com/replit/repl.it/issues/15 https://github.com/replit/repl.it/issues/15.
- xtan 15y agoagreed with op. Lambda is not at all obvious.
- DanielRibeiro 15y agoI liked the fact that it is much faster than ideone[1], even though it has way less languages. [1] http://ideone.com/ http://ideone.com/
- yahelc 15y agoI think the difference is that ideone is actually running those languages on the backend, whereas this is running JS-based interpreters in the browser.
- DanielRibeiro 15y agoI guess this is right.
- amasad 15y agoA quick fix has been deployed. Clicking on the logo would open up the language selector page, and added tooltips to the buttons.
- rhizome31 15y agoIt's fun by itself, but what I believe could make it really useful would be to include interactive tutorials for each language. That's what I was expecting when I clicked the link.
- amasad 15y agoWe have put lots of time and effort into getting all of these languages to run smoothly in the browser, we thought we would showcase this project before continuing on with our plans (more languages, tutorials, etc..).
- rhizome31 15y agoSorry I realize my comment sounded a bit negative, which wasn't at all my intention. You've done a fantastic job already and it's great to know tutorials are on your todo list.
- agentgt 15y agoHitting that QBasic button was like Hot Tub Time Machine... and just as bad as the movie.
- castewart 15y agoAwesome work guys! Keep at it and I would love to play around with tutorials in the future.
- amasad 15y agoThanks, we'll keep you posted for new features.
- Acorn 15y agoWould it be possible to implement user input via the REPL instead of the current javascript prompts? Would be much less clunky. Also, at the moment something like this doesn't work at all (Python): while True: user_input = raw_input() if user_input is 'q': break else: print user_input
- amasad 15y agoThis problem happens with Python/Lua/Ruby because they're compiled from their original lower-level implementations using Emscripten. Which means everything have to work synchronously and there is no way to stop execution in order to get the user's input, unless we transform the code into CPS, which will probably make it much slower.
- wbhart 15y agoI'm unsure about the Scheme that is included. It claims to be R6RS which requires support for exact numerical operations including big integers and rationals. Currently it seems to use only double precision floating point instead of exact integer values!
- amasad 15y agoThanks, will look into this.
- gtani 15y agotry any language online (asymptotically speaking http://joel.franusic.com/w/page/26128430/Online-REPs-and-REPLs http://joel.franusic.com/w/page/26128430/Online-REPs-and-REP...
- fouadjeryes 15y agoThis is KILLER!
- veyron 15y agoThis is awesome! I see this replacing my normal pastebin/ideone workflows ... One comment: in python, technically tabs are equivalent to 8 spaces, but in your REPL it is equivalent to 4 spaces. Is that a modification to the version of python you are using, or did you make a decision to match 4 spaces (BTW: I really like this, but it breaks some older code)
- marekmroz 15y agoIn python you can use tabs or spaces (however many) as long as it is consistent. Don't mix tabs and spaces. 4 spaces recommended. Style Guide: http://www.python.org/dev/peps/pep-0008/ http://www.python.org/dev/peps/pep-0008/ Indentation Myths: http://www.secnetix.de/olli/Python/block_indentation.hawk http://www.secnetix.de/olli/Python/block_indentation.hawk
- veyron 15y agoIt's not really discussed in the PEP but in fact python treats the tab at the same indentation level as 8 spaces. You can mix tabs and 8 spaces without impunity Check http://ideone.com/VIwf4 http://ideone.com/VIwf4 for an example. Basically, it shows that python treats 8 spaces at the same indent level as a tab
- max99x 15y agoI think ideone and/or your editor converts tabs to 8 spaces. Trying a tab indent followed by an 8-space one raises an error in native IPython for me. In any case, we're using normal CPython compiled to JavaScript, so it's unlikely to change finer points of the behaviour like this.
- veyron 15y agoin CPython (at least, on my mac) mixing tabs and 8 spaces works perfectly fine. try it out!
- deleted 15y ago[deleted]
- paufernandez 15y agoI am amazed, more so by the fact that you made the source code available (and also since it's made with node.js). I will have a lot of fun either with the app itself or the source code. Thanks!
- amasad 15y agoEverything happens on client-side the server is just for saving sessions and file serving. So technically its not written in node.js. Node is only a dependency for the development tools we use (coffee-script, mini-server for development). However the server running repl.it is written in Node, its nothing fancy but it makes us run cheap and it will be open-sourced soon.
- cfontes 15y agoNice stuff... What about some SCALA ? mixed paradigm functional + object oriented with a lot of mojo !
- amasad 15y agoScala is great and we would love to have it. But the core philosophy behind repl.it is that everything has to be client-side. We're not very experienced with the JVM languages, but we are planning to experiment in loading them inside a Java Applet. Not sure how doable is this, would appreciate some feedback.
- cfontes 15y agoNice, thanks for the reply... I am not sure either if it can be done like that, but It would be great to have it. Good luck with the experiment I hope it works out well.
- darklajid 15y agoClojureScript?
- amasad 15y agoClojureScript is compiled to JS using Clojure which needs the JVM to run.
- Bartlet 15y agoGreat site. A trivial gripe: you should get rid of the text shadow on the "Select a Language" title. Grey CSS text shadows on grey backgrounds tend to look blurry, and this is no exception. Or, better yet, make it a white 1px shadow with no blur: http://goo.gl/BU0Hu http://goo.gl/BU0Hu
- epenn 15y agoI'm getting a 330 ERR_CONTENT_DECODING_FAILED when I try to load up the site. If no one else is getting this then chances are it's my company's firewall interfering. If its rule set detects either "fun" and/or "potentially useful" the site is immediately banned.
- missing_cipher 15y agoGetting the same error here. Error 330 (net::ERR_CONTENT_DECODING_FAILED): Unknown error.
- amasad 15y agoIs this chrome? Did you try it on other browsers?
- missing_cipher 15y agoChrome 14.0.835.186 m Windows 7, I get the above error. Firefox 6.02 I get: The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression.
- hullo 15y agosame error here as well, also behind a corporate firewall, it's usually fairly well behaved but if it doesn't understand something it's sometimes prone to petulance.
- apl 15y agoScheme runs nicely on an iPhone 3GS. The Emscripten-compiled stuff crashes before you get to a prompt. Still, good stuff! EDIT: I take that back. Lua runs, Python and Ruby do not.
- amasad 15y agoYeah we are working on that. We didn't have a physical iOS device and the simulator cheated us into thinking that it actually works!
- cbailey 15y agoLove it. This site is hella-fast and responsive compared to the other "Try [x]" web apps I've used before. Love the addition of LOLCODE. Personally, it took me a second to figure out the lambda and eg buttons, but I didn't find it frustrating or difficult. Pretty smart if you ask me.
- arvinjoar 15y agoDoesn't work too well with my Swedish keyboard layout. If I want to use "[" or "]" I'd normally use Alt Gr+8 or Alt Gr+9, that doesn't work. This makes it almost impossible to code.
- max99x 15y agoThanks for the report. We're handling input as raw keystrokes for flexibility, so the more advanced features are sometimes not supported. I've opened an issue for it (https://github.com/replit/jq-console/issues/19 https://github.com/replit/jq-console/issues/19) in the appropriate repository. Feel free to watch that for updates.
- csomar 15y agoWhy isn't the print function working in Qbasic? What restrictions are there in the compiler?
- max99x 15y agoYou might be hitting the fact that QBasic actually requires keywords to be in capitals. The original IDE did the conversion for you, but repl.it doesn't. We should really be more lenient about those. For now, check the existing examples and use your trusty caps lock.
- drv 15y agoThe actual QuickBASIC compiler allowed any case for keywords. The lack of line numbers was a bit confusing too - my first inclination when seeing a BASIC prompt is to type 10 PRINT "hello" 20 GOTO 10 Aside from that, it seems to work as expected (at least in the quick tests I tried).
- sratner 15y agoNumeric labels also don't work: 10: PRINT "hello" GOTO 10 This works though: label: PRINT "hello" GOTO label
- jstepien 15y agoI wonder whether Haskell is on their todo list. GHC's LLVM backend [1] might be helpful. [1] http://hackage.haskell.org/trac/ghc/wiki/Commentary/Compiler/Backends/LLVM http://hackage.haskell.org/trac/ghc/wiki/Commentary/Compiler...
- max99x 15y agoI've spoken a little about the reason we couldn't use GHC among other things, at https://github.com/replit/repl.it/issues/43 https://github.com/replit/repl.it/issues/43. In short, we need an interpreter rather than a compiler or a JIT, and we need the interpreter itself to run in the browser.
- jstepien 15y agoThanks for a quick reply. So having GHCi - the GHC's REPL - successfully emscripted could make adding Haskell support possible, right?
- max99x 15y agoIf it uses a JIT internally, it will produce x86 machine code, which is meaningless to us since we aren't emulating the whole machine. If it doesn't, then emscripting it should work.
- WildUtah 15y agoHaskell won't run in a repl, will it? GHCi and Hugs demand that functions be specified in a script file and not at the prompt. Without functions, you really don't have very much of the Haskell language available. It's a partial repl with a fraction of the language at best.
- jstepien 15y agoNot necessarily. You can define functions in GHCi using let. $ ghci Prelude> let fact x = if x == 0 then 1 else x * fact (x - 1) Prelude> fact 6 720
- andypants 15y agoWhat is Javascript.next?
- amasad 15y agoTraceur (http://code.google.com/p/traceur-compiler/ http://code.google.com/p/traceur-compiler/): Its basically JavaScript with proposed language features for ECMAScript Harmony (http://wiki.ecmascript.org/doku.php?id=harmony:proposals http://wiki.ecmascript.org/doku.php?id=harmony:proposals).
- max99x 15y agoTo add to this, each language has an about link and an engine link (shown at the bottom when you select a language). These will take you to a page describing the language and the interpreter we're using, respectively.
- pyre 15y agoOops: > import subprocess Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/lib/python2.7/subprocess.py", line 429, in <module> import select ImportError: No module named select Also: > os.name => 'posix' > os.uname() => ('Emscripten', 'emscripten', '1.0', '#1', 'x86-JS') > os.environ => {'LANG': 'en_US.UTF-8', 'PYTHONHOME': '/:/', 'PWD': '/', 'USER': 'root', 'HOME': '/', 'PATH': '/', '_': './this.program'} > os.getcwd() => '/sandbox' > os.chdir('/') > os.getcwd() => '/' > os.popen2('ls -l') Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/lib/python2.7/os.py", line 667, in popen2 import subprocess File "/lib/python2.7/subprocess.py", line 429, in <module> import select ImportError: No module named select > os.popen('ls -l') Traceback (most recent call last): File "<stdin>", line 1, in <module> OSError: [Errno 24] Too many open files * I liked the 'x86-JS' as the architecture. * I know about os.listdir() but I wanted the permissions. * I automatically did a ^W to delete a word and closed the tab. I don't feel like opening it again or I would probably have more. * I realize that since this is a CPython -> JS converter that the REPL is running in my browser and no on a server (AFAIK) so it's not like this attempting to hack someone's server, but I found it interesting to probe the environment.
- max99x 15y agoThanks for trying it out. * The ^W is fixable, but I'm not sure how I personally feel about hijacking fundamental browser shortcuts. We'll look into it though. * Regarding the environment, in general, multi-threading and multi-processing (and anything that depends on them) are not supported, since Emscripten translates the code to JS rather than emulating a machine. * The Emscripten virtual filesystem has a simple single-user permission model and the libc functions for accessing/modifying the permissions are supported. So technically you could get the permissions through os.access. Not as convenient as ls, of course, but doable.
- pyre 15y agoI will note that when copying the text out of the interpreter, the prompt (>) doesn't copy (I assume that you may be using a CSS :after or :before decorator, though I didn't look). Sometimes even the newline itself didn't copy. For that post I had to cleanup all of the text so that it would display properly. This may be an issue you want to look at if you want to support people copy/pasting stuff that they are working on out of the console (or you may just want to add a button that generates a Github gist or pastebin entry and displays a link to it).
- dgottlieb 15y agoIn Python: Importing urllib hangs zlib imports, but the compress and compressobj methods fail > import zlib > zlib.compress("askldas") Internal error: ReferenceError: _deflateInit_ is not defined
- Legend 15y agoHmm... Chrome gives me: The webpage at http://repl.it/ http://repl.it/ might be temporarily down or it may have moved permanently to a new web address. Error 330 (net::ERR_CONTENT_DECODING_FAILED): Unknown error. :(
- acpmasquerade 15y agoWonderful, Nice to see QBasic there. These days its easier to write for modern High Level languages, as they are easily installed and available everywhere. But the classic and beautiful languages are hard to find and even talked about. Good and nostalgic memories of Programming with the Basic. :)
- LearnYouALisp 15y ago"Beautiful"?!
- esk 15y agoOuch! Awesome apps like this are totally humbling. Congratulations, guys. If you're still following this thread, amasad and max99x, I have a simple question: how many hours did you two put into this?
- max99x 15y agoReally hard to say. We started experimenting with the idea back in March, but didn't start putting fulltime nights into it until August. I'd say a little over a thousand man-hours over the span of 6 months, but I may be well off the mark.
- amasad 15y agoIt was a fruitful experience and if we want to count in the hours of reading and studying that this project has spawned, it would be much more than that. Anyways, the real question is "how much did it cost?": $1600+ in sushi dinners! :)
- deleted 15y ago[deleted]
- derleth 15y agoEvery time I try Python or Ruby, the interpreter loads almost fully and then freezes. Lua and Scheme work fine. Also, good job on allowing me to close the tab after I managed to get QBasic locked in an infinite loop. :-) (Dual-core likely helped.) Firefox 7.0, x86 (32-bit), running on Ubuntu 11.04, x86-64.
- amasad 15y agoYes this is a regression with firefox 7+ browsers, the creator of emscripten (@kripken) has already opened a bug in it https://bugzilla.mozilla.org/show_bug.cgi?id=687951 https://bugzilla.mozilla.org/show_bug.cgi?id=687951 . And ya, we try to sandbox most of our languages inside a Web Worker, which leaves the main thread intact incase of infinite loops and such.
- rohit89 15y agoThis is great stuff. A really good way to play with some languages without needing to install it.
- simcop2387 15y agothe QBasic support actually makes me want to try to add Canvas support to it so that SCREEN 13 CIRCLE (4, 3), 4, 4 and all the other stuff I used to have fun with years ago will actually work.
- max99x 15y agoActually Steve Hanov's implementation which we're using does have canvas support. You can find it at http://stevehanov.ca/blog/index.php?id=92 http://stevehanov.ca/blog/index.php?id=92. We stripped the graphical parts since they make little sense in our UI. At some point we may add graphics support, but if we do it will be to all (or at least the majority of) the languages.
- doc_larry 15y agoWow, really nice. I was looking for a tool to try out some code when working away from my workstation. This fits the bill, its fast and agreable to use. Thanks!