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<zenspider>
ok... outage starting soon
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<erikh>
anyone mind hitting erik.hollensbe.org ?
<erikh>
just moved the server; wondering if dns and pals took
<imperator>
erikh, hm, got some porn site
<imperator>
no, just kidding, works fine
<erikh>
heh. awesome, thank you.
<erikh>
there's no content to speak of on it but it means the rest of everything is working, too :P
<imperator>
something something chef
<erikh>
yes
<densebits>
howdy all
<imperator>
'sup yo
* densebits
nods imperator
* shevy
shakes imperator
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<densebits>
shevy, lol why are you shaking imperator
<imperator>
maybe he's hoping for loose change
<densebits>
Just ask, don't beg.
<densebits>
or shake o__O
<densebits>
That made no sense haha
<shevy>
densebits you nodded him
<densebits>
shevy, :[
<shevy>
so I thought when you can nod him, I can shake him, and some third person could do something else with him
<densebits>
Don't be like me!
<imperator>
in other news, FFI::Type::POINTER.size is what I wanted :)
<imperator>
works on mri and jruby
<shevy>
densebits you got yourself a fan!
<shevy>
let's do something fun with imperator!
<shevy>
awww
<densebits>
imperator, I still haven't decided on if I want to play with JRuby.
<shevy>
if a third guy would have helped us...
<shevy>
:(
<densebits>
JRuby + JBoss + TorqueBox... seems nice... but not sure if I want to just yet.
<shevy>
hehe
<imperator>
densebits, i like tinkering with it, never used it in actualy production though
<imperator>
for a while i was looking at because i thought it might be a better ruby than ruby
<densebits>
imperator, What are you impressions of it? I've heard several "mehs" about it. Using it on Android seems like a possible fun route.
<imperator>
and it is for certain things
<densebits>
your*
<imperator>
densebits, depends on your domain
<imperator>
if you need to interact with a java library, or you need the google app cloud, absolutely
<imperator>
if you're just running a vanilla rails app, meh
<imperator>
if you're doing systems programming, no
<densebits>
3rd comment would do it for me
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<imperator>
game time
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<rue>
Dum dum duu
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<comfreakph>
hi
<comfreakph>
where can I find a website that is giving free tutorial for ruby on rails?
<comfreakph>
thank
<wmoxam_>
comfreakph: try the channel: #rubyonrails
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<josh9>
i am writing a method that checking for balancing of symbols. for example: '[{}]' should be true and '((]' will be false. one way is using a stack. is there a stack i can use or should i implement one (using array)?
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<rue>
josh9: Array#push and #pop are all you need
<josh9>
rue: awesome. i'll give it a try.
<josh9>
so in ruby we don't need stack. pop is removing the last inserted element.
<rue>
It is a stack, more or less.
<TTilus>
josh9: do Stack = Array and then parens = Stack.new if that makes you feel more comfortable
<josh9>
TTilus: nice
<livinded>
josh9: please don't do that
<rue>
:P
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<TTilus>
omg that was supposed to be a joke
<josh9>
TTilus: oh..
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<TTilus>
josh9: if u need a stack, u use Array, as rue said, it _is_ _the_ stack (in ruby)
<josh9>
TTilus: np. will do
<livinded>
TTilus: at least you didn't give him crazy code to insert unicode chars to force the output to be vertical rather than horizontal
<livinded>
...I wonder if there's a rotate 90 degrees unicode char
<TTilus>
livinded: nice idea, gotta try next time somebody asks for stack =D
<livinded>
OH MY GOD! There is!
<livinded>
oh wait, wikipedia fail
<TTilus>
livinded: well, there _are_ up-to-downlanguages after all
<livinded>
TTilus: ya, that's why I thought there might be a rotate because I know there is a flip and reverse
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<livinded>
TTilus: also, don't forget to call #reverse on the array before outputting it
<TTilus>
livinded: or just alias #shift and #unshift as #pop and #push :)
<TTilus>
livinded: bonus, you break more places
<livinded>
lmfao, how slow are you trying to make this
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<TTilus>
livinded: i just thought about making it unstable :)
<livinded>
in my data structures class my professor made us implement a stack on top of a vector but rather than placing new values on the end, like you should, we had to rebuild the vector on each push and put it at the front
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<TTilus>
was that supposed to ba a kind of "now yousee why you dont do it like this"?
<livinded>
no
<TTilus>
AAAAAAAAAA!
<livinded>
I dropped CS and switched to philosophy in my senior year
<livinded>
well, my first senior year
<TTilus>
if that was characteristic, you gain way more by reading philosophy and maths
<livinded>
I filed so many complaints about the professors in my program, it was a fucking joke
<livinded>
and then I tried getting for the software engineering courses for my Summer of Code participation and the department chair denied it
<TTilus>
wrong school?
<livinded>
getting credit*
<TTilus>
doublefail
<livinded>
wrong school and bad advisement
<TTilus>
so wrong in so many levels
<livinded>
the work I did in 3 months for summer of code by myself is more work than groups of students do in two semesters in the software engineering courses
<livinded>
maybe if I had made some UML diagrams and used Java they would have accepted it
<TTilus>
thought about writing to tdwtf on your experiences, they pretty rarely have good wtf stuff from education sector
<livinded>
actually I haven't. I haven't read tdwtf in years
<josh9>
here is an iterative implemetation in o(n) of 'balancing symbols' - http://pastebin.com/YxeYycCg any suggestions for cleaning the code or maybe ideas of doing it recursively?
<livinded>
why are you making your table a hash?
<livinded>
oh
<josh9>
livinded: to make it easy to find the closing match.
<josh9>
i am sure there is a recursive way of solving it. i need to think..
<livinded>
just recursively called the function with the next char to the end of the array and the current opening. Check to ensure that the current opening is the one that's closing. If you reach the end before you come out of the call chain it's not balanced
<livinded>
but the method you currently have is going to be more efficient probably
<ryanf>
you probably don't want to go out of your way to write things recursively in ruby
<lianj>
"{"*10_000 <-
<josh9>
livinded: yeah. i need to practise recursives though.
<livinded>
does ruby implement tail call recusion?
<livinded>
recursion*
<ryanf>
no
<livinded>
ya, stick to iteration then
<livinded>
it'll definitely be more efficient
<josh9>
livinded: what's tail call recursion?
<livinded>
josh9: basically iteration
<ryanf>
tail call optimization is a transformation some languages do that can make certain recursive algorithms run iteratively
<ryanf>
more or less
<ryanf>
if the recursion is the last thing that happens in the function, there's no need to build up an actual call stack like you do with normal recursion
<ryanf>
so it like flattens it out into iteration
<livinded>
it does some memory and instruction pointer mangling to avoid having to actually call another function
<ryanf>
anyway, since ruby doesn't do that, implementing things recursively is a good way to run out of stack
<ryanf>
and be slow, and take a lot of memory
<livinded>
but unless a problem specifically lends itself to a recursive solution (eg. traversing a tree) and it wont be more efficient to do it iteratively you should stick to iteration
<josh9>
livinded: ok
<livinded>
any problem you can solve with recursion you can solve with iteration and vice versa. Certain problems are easier to solve with one or the other and depending on the implementation of the language may be more efficient with one or the other
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<josh9>
speaking of recursion. i found this merga sort. it's working but i don't understand how come i don't need to assign a2=merge_sort(a2) and i only do merge_sort(a2). someone told me it's an in-place sort, but i still don't get it - http://pastebin.com/QH46wghT
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<ddfreyne>
judofyr: temple is yours?
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<ddfreyne>
judofyr: in html/prettty.rb, on line 41, I believe the #gsub! should be a #gsub + assignemnt
<ddfreyne>
judofyr: content that goes into temple is frozen here, but that causes an exception
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<rue>
josh9: #merge modifies a in-place
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<erikh>
I think he was talking about the merge_sort and mistyped
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<Mon_Ouie>
Or he was talking about the Array#merge defined in the pastebin
<Mon_Ouie>
Algo#merge*
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<erikh>
testing things that fork is hard.
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<shevy>
spoon me!
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<shevy>
hmmm
<shevy>
do you use a common pattern when you write classes?
<shevy>
something that you (try to) repeat from one class to the other?
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<burgestrand>
yeah, the order of which I define things in
<burgestrand>
(for example, I try to always open up the singleton class at the top, and only after that follow with include, extend, attributes, instance methods, protected methods and private methods)
<Mon_Ouie>
And define initialize first
<burgestrand>
*nods*
<burgestrand>
Same with self.extended and self.included.
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<shevy>
nice
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<any-key>
I really like the idea but it's a shame emphasis is being placed on speed
<any-key>
not that speed doesn't matter, it just seems like people focus on writing horrible code to win
<any-key>
code golf is more fun in my opinion so weighting between the too would be really fun :D
<andrewhl>
if I'm scraping an html document and I have: type = doc[i].css('td')[5].content which gets me "Rengo" when i = 0, and I want to increment i until my variable "type" no longer == "Rengo" (checking each row until a different string is found), would: while type == "Rengo" i += 1 end work?
<any-key>
try it and find out!
<any-key>
seems reasonable to me
<any-key>
but be careful
<any-key>
you'll want an upper bound on it in case "Rengo" never appears
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<andrewhl>
no, it doesn't work... it checks that type == "Rengo" and then just keeps incrementing i indefinitely
<andrewhl>
because the condition is always true. It doesn't go back to check the html
<andrewhl>
hmm
<any-key>
well you will have to check the HTML each time...
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<andrewhl>
any-key: btw, if you're interested, it looks like the line needed to be: doc = doc.css('tr').reject { |row| row.css('td')[5].content == "Rengo" }
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<jasox>
Hi guys, Is there emacs users? I am wondering is there alternative for rsense in emacs (code completion). tnx
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<shevy>
emacs users all died
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<jasox>
shevy, :D
<Mon_Ouie>
I don't even use a ruby-specific completion source
<Mon_Ouie>
Just the words from other buffers
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<andrewvos>
Well hello there
<dr_bob>
ack
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<Jake232>
"The Well Grounded Rubyist" seems a pretty awesome book
<Jake232>
But I've never seen it rccommended here ;)
<shevy>
never heard it
<shevy>
what would be kinda neat would be a merge of chris pine tutorial into a new styled pickaxe, together with "thinking patterns in ruby"
<Jake232>
Yea
<Jake232>
Rather than just jumping in
<Jake232>
and teaching you ruby code
<Jake232>
It doesnt
<Jake232>
It first begins teaching you about Objects, and the whole ruby heirarchy up to Object, and BasicObject
<shevy>
that's what I liked about the chris pine tutorial
<shevy>
sadly it'll be very outdated eventually :(
<Jake232>
Then moves onto Classes / Modules, then progresses to what "self" references in different parts of your code
<Jake232>
Then it moves onto the difference between Iterators and Enumerators
<Jake232>
It actually covers the core concepts, rather than just teaching you how to code Ruby, with no idea of the underlying things.
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<adam_>
can some one explain SomeClass < ::object (whats the ::object mean and why not use < object)?
<josh9>
and i agree with his observation - when u open a rails app and look at the folder structure all you know about this app that it's a rails. but rails is just the delivery mechanism. it's just a detail and not part of the arcitecture.
<josh9>
what you should see (in any app, not just web) is folders with names of your usage of the app (use cases) -
<josh9>
'make-payment' folder, 'register' folder, etc.
<apeiros_>
adam_: note that case matters, so please write ::Object and not ::object…
<apeiros_>
adam_: to answer your question: ::Object means "top-level constant Object"
<adam_>
that doesn't fully answer my question.
<apeiros_>
if you have `module Foo; class Object; end; class Bar < Object; end; end`, then Foo::Bar inherits from Foo::Object, not Object. using Bar < ::Object would change that.
<adam_>
oh ok
<apeiros_>
adam_: patience. great virtue :-p
<apeiros_>
josh9: that's what you should see when you open app/models. I'm also pondering introducing app/workflow in our company apps. since a lot of things are transitory, not persistent, and right now they're handled by models, which is always only half-responsible…
<apeiros_>
(sometimes it's even handled by the controller… which is arguably worse)
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<josh9>
apeiros_ why models? we are talking about use cases that might span multiple objects and roles. when u say models u mean ruby classes that holds business logic, right?
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<apeiros_>
yes
<apeiros_>
and agreed, if you need "bird view", you need text
<josh9>
i think having use cases (or context, in DCI terminology) will give us better understanding of our apps.
<apeiros_>
or, actually: disagreed - I don't think directories will do any good for that
<josh9>
i havent' seen any ruby app that is doing it though.
<apeiros_>
but maybe I'm just missing a good example.
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<josh9>
apeiros_: yeah, there are some interesting discussions and books coming up -
<josh9>
clean-ruby is a book about using DCI with ruby and i can't wait to read it.
<josh9>
"Data, Context, and Interaction (DCI), was created by Trygve Reenskaug (whom you may know as the creator of MVC) to make your code read the way it behaves. Pull everything out of its hiding place with “Clean Ruby” and learn how using the DCI paradigm means readable code and a super fast learning curve for your newest team members."
<apeiros_>
hrm, maybe I should spend a bit of time on DCI
<apeiros_>
I attended a talk on DCI at railsconf'11, but it didn't sparkle with me…
<josh9>
apeiros_: is it online?
<apeiros_>
no idea
<josh9>
apeiros_: the idea is currently we focus on our classes and make them capable of doing everything. instead we shoud focus on roles:
<josh9>
roles and objects.
<josh9>
so let's say you have a user.
<josh9>
this user can play multiple roles.
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<josh9>
right now this user is a mom.
<josh9>
during the day the user is a programmer, and at night the user is a manager of a coffeeshop.
<josh9>
let's have each role in a Module -
<josh9>
Module Manager; def fire;end; def hire; end; end
<josh9>
user = User.new
<josh9>
user.extend Manager
<josh9>
user.hire
<josh9>
user.fire
<josh9>
i am not sure how to unmix a module in ruby, but if it's a web app we don't need to since every request will give us new clean ruby object.
<andrewvos>
josh9: Don't think you can
<josh9>
so we applied a role to our object
<josh9>
and this role is temporary, just like the real world.
<josh9>
and all our logic is in modules instead of live part of our class. easy to manage and test.
<andrewvos>
josh9: How is it easier to manage and test?
<apeiros_>
josh9: the use of extend to achieve that was one thing that I disliked very much
<apeiros_>
maybe a bit less if ruby was capable of unextend
<apeiros_>
but right now, your object just starts accumulating functionality. you could have given it all just from the start too.
<josh9>
andrewvos: testing small pieces of functionality is easier.
<josh9>
apeiros_: but you might not need all that capability/roles all the time.
<josh9>
your classes should not be inherited from activerecord.
<apeiros_>
josh9: I'm aware of that. but you cannot *remove* a capability anymore
<andrewvos>
josh9: That's a pretty blanket statement though. If you're testing small pieces of functionality it doens't matter if they're in a module or the same class.
<apeiros_>
so you'll grow capabilities until you eventually have all anyway
<apeiros_>
josh9: as much as I like banisterfiends creations, I wouldn't use that in production.
<apeiros_>
and iirc he said the same himself
<josh9>
apeiros_: even without the ability to unmix a module i think it's nice to keep my classes smaller.
<apeiros_>
josh9: ok. but it's not the route I try to go.
<andrewvos>
I really don't like the idea of unmixing modules. Also, I don't see how it could ever be useful.
<josh9>
and in the context of the web, i don't care about unmix since the object is short-lived.
<andrewvos>
josh9: That implies that all the ruby code gets executed every request. It doesn't
<andrewvos>
josh9: Not like in php.
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<apeiros_>
mhm, framework-level code isn't short lived
<apeiros_>
only request-level code is
<andrewvos>
Like in sinatra. The Application class is short lived
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<andrewvos>
But it's only evaled once.
<apeiros_>
and request-level code can travel to framework-level easily (think caching e.g.)
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<josh9>
andrewvos: but if i create a user object inside get '/'; end; isn't this object being created on every request to '/'?
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<andrewvos>
josh9: Yep
<andrewvos>
josh9: But not evaluated
<andrewvos>
josh9: So you want to do something like: u = User.new; u.mixin(Module1); #dostuff; u.unmix(Module1) ?
<josh9>
andrewvos: wait. because the code is evaluated only once, the module is still mixed?
<josh9>
i guess i am not what 'evaluated' means.
<andrewvos>
josh9: By evaluated I mean executed.
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<josh9>
andrewvos: so in sinatra, my code will be executed again and again, therefor my object will be clean, without the module mixed-in. so i have no need to worry?
<josh9>
sorry if i got it all wrong..
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<andrewvos>
josh9: No
<andrewvos>
josh9: Each file will be executed only once
<andrewvos>
josh9: But sinatra basically does Application.new for each request.
<andrewvos>
josh9: What I mean by executed only once is that the code that defines the class is executed only once. The methods inside that class are exectued on every request.
<andrewvos>
So for example "class SomeClass" will be executed only once.
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<josh9>
andrewvos: oh. so if i have modules, classes, etc that are not part of my handlers(routes), they will be executed only for the first user of my site.
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