Re: Errors in Clojure

[r0man]

The message 'FATAL: role "lobos" does not exist' says you are trying
to connect to PostgreSQL as the user/role "lobos". I saw that you
defined a :user in your config, but maybe it doesn't get picked up by
lobos. Just my 2 cents ...

Roman

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Re: Video & Slides on Pattern Matching and Predicate Dispatch in Clojure

[Timothy Washington]

Excellent talk David. This is hitting a programming sweet spot that I've
wanted for a while. I haven't tried prolog, standard ml, haskell, etc. But
jquery was the first tool that clued me into a kind of pattern matching and
predicate dispatch:


$( ".classA .classB#containingId" ).doSomething();

$( "[ fubar=thing ]" ).doSomething();


But your tool seems to be more elaborate. Now, exploring the other
functional languages has jumped to near the top of my todo list. This
reminds me of a talk Reginald
Braithwaite
gave
(around the 16m 20s mark), he actually hinted that he'd wanted to explore
something like this in Ruby. At the time, he was discussing his work on
Rewrite . Love getting excited about
increased expressive power. Thanks for the insights :)


Cheers

Tim



On Thu, Aug 18, 2011 at 1:42 PM, David Nolen  wrote:

> In case you didn't see this elsewhere:
>
> http://vimeo.com/27860102
>
> David
>
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Re: Another ClojureScript app in the wild

[Colin Yates]

Excellent - cheered me up no end whilst migrating (read re-installing) the
60-odd virtual machines from VMware ESXi to XenServer (it is currently
1.05AM in the UK so desperately needed a cheer)

Thanks for sharing the source - I fully expect to learn a lot after reading
it - keep up the good work :)

On 18 August 2011 09:08, Matthew Gilliard wrote:

> > Very cool! Now the logic of pacman is in a form I can easily read :-)
>   I assume you are referring to the gameinternals post not my code !
>
> I do not know why it only works in Chrome.  The error "too much
> recursion" is confusing.  It happens before the game is rendered so I
> suspect it's in the code which parses the board.  The only explicit
> recursion I do is my implementation of (range) here:
> https://github.com/mjg123/pacman/blob/gh-pages/src/pacman/board.cljs
> - but that uses (recur).  There's also the nested for loop in that
> same file, I have no idea how (for) works internally.  The gameloop
> uses a javascript timer-with-callback to call itself so that won't
> consume stack space.  Another thing is that it seems to be machine
> dependent - it works fine in ff6 on my work pc but not on my (much)
> older home PC.
>
> There are also rendering bugs in Firefox which seem to be caused by
> SVG arc-segments with negative radius - I assume this is just an
> implementation difference in a grey area of the spec.
>
> If there's interest I can try to pare down the code to a minimal case
> which throws the "too much recursion" error?
>
>  mg
>
>
>
> On Thu, Aug 18, 2011 at 8:04 AM, Sam Aaron  wrote:
> > Very cool! Now the logic of pacman is in a form I can easily read :-)
> >
> > Out of interest, do you know why it only works in Chrome? Doesn't the
> closure library do any work to shield you from from the browser differences,
> or is it simply a performance issue with the Chrome js engine the only one
> operating fast enough to smoothly render the game?
> >
> > Sam
> >
> > ---
> > http://sam.aaron.name
> >
> > On 17 Aug 2011, at 23:00, Matthew Gilliard wrote:
> >
> >> I've been playing around writing a fun little ClojureScript project -
> >> it's a bit different, so I thought you might like to see it:
> >>
> >> http://mjg123.github.com/pacman/pacman.html
> >>
> >> As I was feeling my way quite blindly through ClojureScript and
> >> gClosure I have let the code get into a bit of a mess and I don't
> >> think I'll really work on it much more.  I have learned an awful lot
> >> though (which was the main objective) - my main lessons are:
> >>
> >> - ClojureScript is awesome.  The performance and stability of it are
> >> really astounding.  Really great work guys.
> >> - Debugging a ClojureScript app is hard.  I never figured out how to
> >> get js/console to work.  My best solution was to compile & run very
> >> often, so that errors were caught quickly.  Better yet would have been
> >> thorough testing ;)
> >>
> >> - it *is* possible to write a game with no mutable state (well, I use
> >> an atom to hold the most-recently-pressed key, but apart from that...
> >> The state-of-the-world datastructure is immutable)
> >>
> >> - Some functions missing from ClojureScript which surprised me: range,
> int
> >> - Some functions behave differently between Clojure and ClojureScript
> >> (due to underlying platform differences): mod
> >>
> >> - Testing is very important.  The gClosure jsunit stuff looks nice
> >> but I'd love a midje-like API for it.
> >>
> >> Browser-compatibility:  Chrome - OK, Firefox 6 - sometimes crashes
> >> with "too much recursion", IE/Safari - Forget it.
> >>
> >> Happy to answer any questions, otherwise I'll be over here hacking
> >> some Clojure   :)
> >>
> >> Matthew
> >>
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