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Show HN: Online Haskell REPL

repl.it

82 pointsamasad20 comments

I just want to say congratulation to repl.it that has brought Haskell to it. I love using repl.it whenever I need to create and test a small program. Beside that, repl.it is an open source product (https://github.com/replit/repl.it).

By the way, I have no problem opening repl.it on Firefox. It runs flawlessly.

> Deprecation notice: This project is no longer actively maintained because we're moving language sandboxes to the server for a faster, complete, and up-to-date implementations. You can use our API.

That's not ideal, but fair enough. Goes to API page

> We're not accepting anymore customers as we focus our Classroom product

Did you just tell me to go fuck myself?

Lol yeah I just pushed that API deprecation today. We had a free API access for almost a year. And people hammered us with support emails. Up until two months ago we were only two people on this and half of us were programmers. the guilt of not replying to everyone who is emailing was just too much.

For some reason, repl.it crashes my FireFox without fail every time I try to open a REPL.

It's a shame; there have been several occasions over the past few months where it would have been extremely useful, but instead brought things crashing down.

It works great for me (also on Firefox).

I don't even know where to begin debugging. My browser just locks up and has to be killed. Usually before the page with the REPL even starts rendering.

Weird.

Sorry to hear that. I'll make sure to fix it. Are you on windows? What version of Firefox?

Aside: Firefox have been breaking our site every couple of months and we have to keep hacking around their regressions.

Random feedback for your main site: It's totally unclear to me if you only offer some kind of classroom product or something for more general use. Some of the text indicates the latter, but all the sign-up stuff seems to only target the first.

Thanks, this is valuable feedback. We're in an awkward transitional phase in our marketing material / landing pages.

Thanks for reaching out! Just plain FireFox on Windows. Automatic updates are on, currently at version 51.0.1.

Let me know if there's anything I can do to help!

Someone managed to hang your backend ghci or some such it seems.. simple enquiries such as `:t reverse` or `:i Maybe` bring no response in over a minute. Could be a client-side issue too (FF 51.0.1 in 64bit Win 8.1) but nothing shown in the browser console..

Nope it's working fine. It's the Firefox bug (see sibling comment). If you know how to report bugs to FF please do. We can't repro on our side.

I always find myself trying readline shortcuts in my browser. Control + w and my tab closes. Grr.

I can import modules in the repl, but not in the editor:

    import System.IO

    main :: IO ()
    main = return ()

After clicking run, this fails with "error: expecting a single import declaration".

How are you sandboxing it?

Docker but not just throwing in a container and calling it a day we use the user namespaces, seccomp etc. On top of that the machines running the code are completely disconnected (different cloud) from any user data etc.

I was able to hang the session using unsafeCoerce to cause a segfault, so you might want to specify -XSafe in the GHCi options for good measure. I don’t think there’s a way to unset -XSafe in a session once set; trying :set -XUnsafe rightly generates an error.

Awesome work @amasad—love repl.it! Let me know if you're back in NYC anytime soon—we missed each other in September if you remember.

Will sure do! Thanks.

Pretty cool, might be very useful for students in MOOC.

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