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<first-time-stude>
Hi All, is this the right place to ask for advice/help on Ruby problems?
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<Aria>
Yep!
<Aria>
Welcome!
<first-time-stude>
OKay! I am a new student and I have a query: My teacher would like me to find the longest word in a string. I figured out how to do this with Ruby's sort! method and a comparative operator, but my teacher has mandated that I must use a Loop in order to accomplish this task
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<first-time-stude>
What is the best approach to solve this problem>
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<jhass>
first-time-stude: probably grilling the teacher over an open fire. Best solution: split.max_by(&:size), desired solution: max = ""; words.each do |word| max = word if word.size > max.size; end;
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<jhass>
the latter is pretty much just reimplementing max_by of course
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<first-time-stude>
jhass, thank you for your advice. I'm going to study this and get back if I have ny questions
<first-time-stude>
Do the semicolons in your syntax mean new line?
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<baweaver>
Avoid semicolons in ruby
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<baweaver>
chances are high you won't actually need them
<jhass>
yes
<jhass>
it's valid syntax but real code should replace them with newlines
<first-time-stude>
right, but I mean in jhass's code, I think he is using the semicolons to indicate a new line
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<first-time-stude>
thanks lol, I just started learning code iterally 3 weeks ago, so yea
<havenwood>
first-time-stude: yup, semicolons in examples means use real newlines in real life
<drbrain>
>> out = []; out << 'unless'; out << 'you'; out << 'submit'; out << 'to'; out << 'ruboto'; out.join ' '
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<first-time-stude>
Hi all, I have a question regarding my earlier query: Finding longest word in a given string. Can someone walk me through this piece of code and explain how it works? http://rubyfiddle.com/riddles/3af73
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<havenwood>
first-time-stude: Line one begins to define a method #longest_word with a single `sentence` argument that's presumably a String.
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<first-time-stude>
Okay, I follow so far, Havenwoord
<havenwood>
first-time-stude: Line two sets the `words` local variable to an Array of Strings created from splitting the `sentence` String on spaces.
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<havenwood>
first-time-stude: At this point the code strays from the idiomatic path.
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<first-time-stude>
what does that mean? Does that mean That the code goes against best practice and opts for the more difficult path?
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<havenwood>
first-time-stude: Yeah, it's not the path of perfection. There are technically better ways.
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<havenwood>
first-time-stude: On line four the local variable `longest_word` is initialized as `nil` (itself a sign things may be wonky) which is the same bareword as the `longest_word` method it's inside.
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<havenwood>
first-time-stude: In irb or pry try creating a method and instance variable with the same bareword. See which ends up getting called when you make one then the other, restart irb and try the other order.
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<first-time-stude>
what do you mean by bareword?
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<havenwood>
first-time-stude: Just letters with no sigil in front or anything like that. Both local variables and methods are "barewords."
<havenwood>
first-time-stude: Like `words`, `sentence`, `word_idx` but not `1`, `:example`, `"hi"`, etc.
<first-time-stude>
Ah, I think I understand, barewords have no inherent value within themselves, because they are created on the spot by the user - is this correct?
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<havenwood>
first-time-stude: They're either local variables or methods. Try playing with it in irb or pry.
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<havenwood>
first-time-stude: Have you used irb or pry?
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<first-time-stude>
Nope :) My teacher has not set it up for the class
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<first-time-stude>
But I understand what you mean by barewords now
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<first-time-stude>
Atleast, I understand enough for the context of this lesson
<havenwood>
first-time-stude: From your commandline type: irb
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<havenwood>
first-time-stude: For example a simpler version of that method might read: def longest_word(sentence); sentence.split.max_by(&:size) end
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<first-time-stude>
I typed IRB in my mac's terminal
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<havenwood>
first-time-stude: Try causing an error by just typing: word
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<first-time-stude>
yes, the error of undefined LocalVariable is my return
<havenwood>
first-time-stude: It should be a NameError.
<havenwood>
Ah, 1.8?
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<first-time-stude>
uh
<havenwood>
nevermind
<first-time-stude>
Havenword, I think it might be worth mentioning I dont have Ruby installed on my Mac, does this matter?
<havenwood>
first-time-stude: Now try: def word; 'sekret' ; end
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<xybre>
It comes pre-installed usually
<capin>
yup
<havenwood>
first-time-stude: (Hit return for a newline in place of the semicolons.)
<slushdot>
Hello. FUCK ALL SPICS, NIGGERS, JEWS, CHRISTIANS, SAND NIGGERS, DUNE COONS, KIKES, CHINKS, WETBACKS, FAGS, DYKES, AND PEOPLE WHO LIKE PEACH ICE CREAM, JOIN #WEB FOR FREE OPS AND TELL THEM EMERSON SENT YOU. FREE GAY MIDGET PORN!!!!!!!!!!!!!!!!!!
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<havenwood>
first-time-stude: So the local variable `word` stomped on the method `word`.
<havenwood>
first-time-stude: Now again try: def word; 'trying'; end
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<havenwood>
first-time-stude: And one more time check: word
<first-time-stude>
a local variable
<first-time-stude>
is the return^
<havenwood>
first-time-stude: So if there's a local variable and a method of the same name, the local variable wins.
<first-time-stude>
I see
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<havenwood>
first-time-stude: So it's confusing to have both local variables and methods with the same name.
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<havenwood>
first-time-stude: And if neither is defined but you try it it'll raise an error.
<first-time-stude>
Havenwood, if I may interject - are you basically informing me to caution against using similar words in defining methods/variables?
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<havenwood>
first-time-stude: Yup, exactly.
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<first-time-stude>
I see, you must understand that my teacher is trying to Mr.Miyagi us and have us to Wax on Wax off in Ruby until we can write small scale code the hard/long way first before we learn better techniques
<first-time-stude>
tldr; its a pain in the ass, but who am I to complain
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<havenwood>
first-time-stude: The last line of the method implicitly returns so you should drop the `return` and just have `longest_word` on the last line.
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<havenwood>
first-time-stude: The last evaluated statement of the method will be its return value if there isn't an early return.
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<first-time-stude>
I understand this part, yes, but this code was written by my teacher - so I must live with it lol
<havenwood>
first-time-stude: Koans are good. Meditate on code to reach enlightenment!
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<havenwood>
first-time-stude: aha
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<first-time-stude>
But Havenwood, I believe my problem of undertanding lies in specifically Lines 8-13 of my teacher's code
<havenwood>
first-time-stude: You may enjoy going through the Ruby Koans to learn some Ruby while also learning testing: http://rubykoans.com
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<first-time-stude>
Do you think you can explain this to me?
<havenwood>
first-time-stude: Strings have indexes starting at zero for the first character.
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<havenwood>
first-time-stude: `word` is a String so line eight sets the local variable `current_word` to the `word_idx` (Integer) index of `words` (String).
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<first-time-stude>
Okay, I understand both of your concepts
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<havenwood>
first-time-stude: So the `word_idx` starts at `0` and sets `current_word` to the first element of the `words` Array.
<havenwood>
first-time-stude: So the local variable `current_word` is the first word on the first iteration of the Array.
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<havenwood>
first-time-stude: The `longest_word` starts out as `nil` as per line four.
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<havenwood>
first-time-stude: So on the first iteration the `longest_word` will always be `nil` and the if statement will set `longest_word` to now be `current_word`.
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<first-time-stude>
Ok
<havenwood>
first-time-stude: On subsequent iterations it wont be `nil` anymore so the `elsif` clause will check if it's longer than the current word.
<havenwood>
first-time-stude: If so, it'll replace the old `longest_word` with the `current_word`.
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<first-time-stude>
Okay, I have understood what you have said so far
<havenwood>
first-time-stude: Then line sixteen increments the index counter to manually move onto the next iteration.
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<first-time-stude>
so how does this code compare the lengths of specific words against other words in the array?
<havenwood>
first-time-stude: It'll go back to the `while word_idx < words.length` and if the newly +1ed `word_idx` is now >= `words.length` it'll break.
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<havenwood>
first-time-stude: It's an awkward way to manually start at index zero of the Array and iterate until the last element is reached.
<havenwood>
first-time-stude: If it's the first iteration it sets longest_word to current_word. Otherwise it updates longest_word only if the current_word is longer than the previous longest_word.
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<first-time-stude>
wait a minute, I think I understand this now
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<first-time-stude>
it loops through the array and compares the length of the current word against the longest word
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<pcfreak30>
Novice question. is there a reason to use a module over a class for static methods? I know a module inherits a class.
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<Nilium>
I think I've spent too long doing PHP maintenance and not enough time writing stuff that goes really fast
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<grekkos>
not sure if this is the best place to ask btu I'm trying to troubleshoot my jekyll install, it's failing to load a plugin for some reason. It does a require with the full path to the file but I get a LoadError and I don't know why
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<grekkos>
if I output the file it's trying to require, it's pointing to the right path and everything
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<BraddPitt>
can you paste the error and some relevant code, grekkos ?
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<certainty>
moin
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<baweaver>
Interesting problem I just remembered
<baweaver>
Given multiple lines, turn their text into columns
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<baweaver>
make a variant for left, center, and right alignment
* baweaver
is futzing with the idea in pry right now.
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<baweaver>
given the string: "abc de fg\nawef feawfwef fefew\nawf efwaf fewfwewfe \nfewafe fef efefaew\nfewafe fewaf aefwf\n"
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<baweaver>
adjust the spacing to align the words
<baweaver>
left alignment for now
* baweaver
goes back to pry
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<Guest84489>
Then I have re = Regexp.new(map.keys.map { |x| Regexp.escape(x) }.join('|'))
<Guest84489>
And then I call it here re = Regexp.new(map.keys.map { |x| Regexp.escape(x) }.join('|'))
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<Guest84489>
the problem is, it's taking everything that is blablan*nil*blah and making it NULL... I want it just to take a line that only has nil not words before or after it
<TomyWork>
you pasted the same line twice, Guest84489
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<TomyWork>
also you might want to pick a more memorable nickname :)
<Guest84489>
TomyWork: sorry.. I call it here sqlFile.write (GenerateSQLInsert(csvFile,eachRow).gsub(re, map))
<Guest84489>
oh, my session expired
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<TomyWork>
awk oh you're the guy who's doing sql the hard, injection-prone way
<TomyWork>
just use a framework
<awk>
TomyWork: give me a break , im a noob at ruby
<awk>
im trrying and took your advice, I re-did all my code the way you advised
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<awk>
using CSV.parse, etc... and match key -> value with hashes
<TomyWork>
might work similarly for other databases
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<awk>
got it working thanks
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<awk>
TomyWork: I'm going to go through that in my ruby book, because i see it's going to save me allot of time.. im using to much of a 'bash' mentality when using ruby and thats my downfall.. thats why I re-wrote it using the CSV gem and GoogleDrive gem
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<TomyWork>
think of prepared statements as the equivalent of the quote-every-expansion rule then :)
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<waxjar>
does anyone know a good way of sharing a folder of configuration files between different rack deployments? i'd like to deploy config changes separate from application code changes. config changes apply to multiple rack apps, so i'd like to be able to deploy them to all apps at once, but it should also be possible to deploy them to a subset them
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<bougyman>
waxjar: puppet or chef.
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<joncol>
How would I test (using rspec) that a method m in module M calls a method n in the same module M? I want to mock the method n, and just test that the method m does what it should.
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<certainty>
alternatively: before { allow(M).to receive(:n) }; it "works" { M.m; expect(M).to have_received(:n) }
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<ChampS_>
jhass: good morning, I imploded and removed my .rvm dir from Ben home directory and installed it in another users homedir. But when I wanna use this command "passenger-install-apache2-module" as that other user, it returns /usr/lib/ruby/1.9.1/rubygems/dependency.rb:247:in `to_specs': Could not find passenger. As User Ben it will work, but I stopped it.
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<EdwardIII>
hey if you wanted to say do 3 tasks at the same time (e.g. 3 slow http calls) then aggregate all the results to display them what would be the right tool for that? Background worker?
<EdwardIII>
in python i'd probably use celery
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<EdwardIII>
also i use rails - not sure if that has anything builtin for this
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<miskatonic>
is there a canonical way to implement stacked hashes in ruby?
<joncol>
certainty: thanks. It didn't work in my case. I'm trying to test some EventMachine stuff. Specifically I want to test that send_datagram is called by my receive_data method when it gets certain data. But I get the error that "PingServer does not implement: send_datagram", where PingServer is my module m.
<EdwardIII>
maybe EventMachine would be the right choice for me actually? although that mostly seems to be to do with async network stuff rather than just firing off things into an eventloop...
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<certainty>
joncol: what kind of method is that in your module? Can you gist what you did?
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<certainty>
joncol: if you want to test the methods like this you have to include the module into a class and run the expectations on the class. If the methods make sense on their own, you can make them module_functions and have your expectations as I showed
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<joncol>
certainty: Cool, I have to read up on module_function. Long time since Ruby.
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<EdwardIII>
but i want to be able to do multiple requests for sort of... anything, like i can in js or with celery
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<EdwardIII>
not necessarily just http requests
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<joncol>
certainty: still not sure about how to test the EventMachine stuff. The problem is that send_datagram is not a member of my module, it is part of EventMachine::Connection, which dynamically mixes in my module. So how could I set up mock expectations for send_datagram to be called?
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<Porfa>
this never happened to me before.. i can't put the contents of a var, but the var name instead
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<EdwardIII>
ah i think i have two versions installed: eventmachine (1.0.8, 1.0.4) heh how the hell did that happen
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<EdwardIII>
hmm ok down to 1 version but still seeing the error
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<workmad3>
EdwardIII: that would probably be because MultiRequest comes from the em-http-request gem, which you will need to install & require
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<ChampS_>
I have a user Ben and a user Ruby, as the name describes, the ruby user is for my ruby installation. In my ruby users home dir now I have a .rvm and a .gem directory. So I installed rvm for this user. Now I tried this: passenger-install-apache2-module with my ruby user, but an error appears /usr/lib/ruby/1.9.1/rubygems/dependency.rb:247:in `to_specs': Could not find passenger (>= 0). But I've
<ChampS_>
installed ruby-passenger with apt-get. With my user Ben, I can execute this command without any problem
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<shevy>
ChampS_ yeah you use more than one ruby version so problems appear
<EdwardIII>
workmad3: damn
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<darix>
ChampS_: if i recall correctly you dont need to have passenger in your gemfile
<workmad3>
EdwardIII: you don't want to install another gem? :)
<EdwardIII>
workmad3: no, i love installing gems. more in reference to the fact i didn't realise that it was a separate module
<workmad3>
hehe :)
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<EdwardIII>
back after playing a bit more i'm starting to think that something like Sidekiq might be better than just EventMachine if i want to execute anything async and get a result rather than just, saw, bare http requests
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<nofxx>
EdwardIII, sidekiq is almost better than a toaster. Really can't tell which one I could live w/o.
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<nofxx>
toaster is the second greatest invetion of mankind, follow by sliced bread*
<EdwardIII>
you're referring to the mechanical toaster rather than the ruby lib 'toaster' right?
<nofxx>
yup
<EdwardIII>
just looking with someone here about doing a little social network aggregator thing for giggles
<EdwardIII>
and didn't want it to slow down with each new network it queries
<nofxx>
that quote is nice, just wanted to say sidekiq rocks. Btw, I prefer italian bread, slice and toast... hmm. olive oil or cheese. hehe
<EdwardIII>
heh sorry which quote?
<nofxx>
EdwardIII, scale horizontally easily with sidekiq... you're db will be the bottleneck quickly
<nofxx>
EdwardIII, toaster second great invention followed by sliced bread
<shevy>
lol
<miskatonic>
sliced arrays?
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<dEPy>
Are there any examples of really good object oriented ruby code?
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<dEPy>
Something beyond a trivial app.
<shevy>
everywhere
<EdwardIII>
it's all on github you can look at rails eh?
<shevy>
look at the source code of rack
<ChampS_>
shevy: right, but for rvm this should be no problem I think
<miskatonic>
is rexml really good object oriented code?
<shevy>
the above output looks like debian-gem output
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<ChampS_>
I try to uninstall the debian ruby package
<ChampS_>
lets see whats happens
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<paolochiodi>
Hi, does already exist a gem that can concat Enumerables? So that when I dot concatenated.next it will return me elements from the first until it's empty then return from the second?
<paolochiodi>
this could be useful for lazy enumerables
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<jhass>
ChampS_: you did gem install passenger inside your new RVM environment? again check rvm current to make sure it's active
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<EdwardIII>
tbh as none of the languages i've used really support threading (other than a bit of C# back in the day) it's kind of a foreign concept to me
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<EdwardIII>
i see stuff like "requires thread-safety of your code and all dependencies." and i'm like... how big an issue is that for me?
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<odigity>
It's great that we have structured metadata formats like RDoc and gemspec that makes awesome tools like rubygems.org and rdoc.info possible. I'm surprised there's not yet one for Changelogs. Would love to make a dashboard that shows me changes across all my gems in the last week/month/etc
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<EdwardIII>
unless you get their non-foss pro thing that includes 'batches'
<EdwardIII>
and it kinda looks like you can't do that with resque either, seems more like a normal message queue
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<EdwardIII>
ah actually it looks like i might be able to use sidekiq along with this lib that turns the jobs (tasks? threads? workers?) into promises: https://github.com/jamesotron/sidekiq-promise
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<ruboto_>
jhass # => "505050505555050027411682610093162639191707102445083998136999255337586664724449168995470686397553704 ...check link for more (https://eval.in/452060)
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<bigmac_>
god you are amazing
<ChampS_>
jhass: sry I didn't know that I can install passenger with gem itself. But now I have and this works fine except that apache can't start because it can't handle RailsEnv and several properties I defined in my sites-available apache config
<adaedra>
jhass is a god? :o
<jhass>
adaedra: only a pope, some people can't tell the difference
<adaedra>
:')
<jhass>
ChampS_: that doesn't sound like you have passenger loaded
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<ChampS_>
used gem install passenger and then passenger-install-apache2-module
<bigmac_>
"%d" % 5.0505050555505e+245
<ChampS_>
both was running successfully
<bigmac_>
can this be explained with basic math terms?
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<jhass>
bigmac_: "explained"?
<bigmac_>
"%d" => not sure what this is and why its in quote
<jhass>
ennn means * 10 to the power of nnn
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<bigmac_>
i see
<jhass>
and that's basically just moving the . to the right by nnn places
<jhass>
bigmac_: ^ so it's just a Float, IEEEIcanneverrememberthenumber precision issues apply
<moss>
I am thinking of switching my Rails server from Unicorn to Puma. Do I need to make any code changes to have this work properly or is it just a matter of deployment?
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<bigmac_>
jhass: so, if im looking to perform this large math and want precise results, its best to use something like bigdecimal ?
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<jhass>
?rails moss
<ruboto_>
moss, Please join #RubyOnRails for Rails questions. You need to be identified with NickServ, see /msg NickServ HELP
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<jhass>
bigmac_: yeah
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<davethecat>
Can anyone please help? When i use .reverse_each method i have no problem, but when i change it to .each i get error "undefined method `source_key' for nil:NilClass"
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<jhass>
EdwardIII: I still don't know eventmachine
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<jhass>
?code davethecat
<ruboto_>
davethecat, We can't help you without your code, please post it to https://gist.github.com
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<davethecat>
doh fixed it
<EdwardIII>
jhass: hmm maybe a lot of people don't bump into these kind of issues
<EdwardIII>
i'd think it's fairly common though
<EdwardIII>
pretty much everything i do is very http-request-heavy
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<EdwardIII>
doing that kind of stuff in php is an absolute, complete and utter nightmare
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<EdwardIII>
doing it in JS is pretty simple
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<pcfreak30>
What is the ruby feature called for this syntax ":controller => 'site', :action => 'login'"
<bigmac_>
jhass: ok, one more thing lol how can i multiply X by 2(800.times)
<havenwood>
pcfreak30: A Hash. Those `=>`s are called Hash rockets.
<bigmac_>
with out using a loop?
<bigmac_>
800.times{|y| x*2}
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<pcfreak30>
havenwood: do you need {} if passing multiple hashes
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<caliostro>
how can i add clean task to an array of prerequisities tasks?
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<caliostro>
need something like this task :compile => clean + sources do |t,args|
<canton7>
task :task1 => [:task2, :task3] do ...
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<canton7>
^ that's the syntax. you can use all of ruby's array methods to make that array of dependent tasks
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<caliostro>
found! task :compile => ( sources.unshift(:clean) ) do |t,args|
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<canton7>
caliostro, task :compile => [*sources, :clean] do ... is another
<caliostro>
i nees to prepend the clean task
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<canton7>
oops
<canton7>
=> [:clean, *sources]
<canton7>
then :clean comes "before" *sources visually, as well
<caliostro>
ah, ok! let me see the * operator
<canton7>
it's called the "splat operator", for your googling
<caliostro>
rake is not my preferred tool, i prefer mallet (big hammer)
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<canton7>
that's very hard to google for, apparently
<canton7>
given that mallets are often used in building stuff...
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<EdwardIII>
so in ruby, fat arrow doesn't just mean "value for this hash key?"
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<canton7>
that's what it means here, as well
<jhass>
it's also used in the rescue clause, but that's all I remember atm
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<canton7>
expanded, that's task({:compile => [stuff]) do ... end
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<canton7>
oops, task({:compile => [stuff]}) do .. end
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<EdwardIII>
ah ok that makes it clearer heh
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<EdwardIII>
so in ruby, if it's all on one line, you can just plug away with key/value pairs and it's shorthand for a hash?
<canton7>
when you're calling a method, you can skip the {} around hashes and ruby will insert them
<EdwardIII>
right ok
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<EdwardIII>
just a little more sugar then
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<EdwardIII>
kinda does away with the need for kwargs too then i guess
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<canton7>
I think that was the intention - you can also use foo: 3 instead of :foo => 3
<EdwardIII>
although it looks like you have that now too
<canton7>
.. but it has downsides to kwargs, so that came later
<EdwardIII>
does it?
<canton7>
using standard parameters is easy. plucking the values you want out of a hash starts to get annoying
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<prefixed>
yo. what is the RDOC way of specifying the valid options of a method's options hash?
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<mwlang>
Does Ruby have a better way to grep file contents than backticks: `grep -lr pattern *` I found the grep for Strings, but wondering specifically about same for files.
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<ChampS_>
jhass: passenger is installed and in my apache config file I've included <IfModule mod_passenger.c>PassengerRoot /home/ruby/.rvm/gems/ruby-.2.1/gems/passenger-5.0.20 PassengerDefaultRuby /home/ruby/.rvm/gems/ruby-2.2.1/wrappers/ruby </IfModule>
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<jhass>
ChampS_: ruby-.2.1 looks weird
<ChampS_>
oh u're right
<ChampS_>
its 2.2.1
<ChampS_>
so a bug in passenger output
<ChampS_>
I copy pasted this line cause the output was telling me to do so
<ChampS_>
mh nope in my file its 2.2.1
<ChampS_>
just a copy paste failure of me from file to irc
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<treehug88>
mwlang you might be interested in "ack". Though I'm not exactly clear what your question is
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<prefixed>
YO. what kind of exception would you throw if a shell command fails?
<prefixed>
*raise
<jhass>
what does it do?
<prefixed>
rsync
<jhass>
sounds like the whole purpose of the script is to call it
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<jhass>
are you going to rescue it?
<prefixed>
it could fail a myriad number of ways, but i'd like to make it clear that the shell program failed
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<prefixed>
and no, i'm not going to rescue
<jhass>
then I'd use Kernel#abort
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<prefixed>
why
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<mwlang>
treehug88: well, essentially, Dir.glob(‘*’).select{|fn| File. read(fn) =~ /some_pattern/} but with recursion into the folders
<jhass>
because you won't recover the error
<prefixed>
hm. reasonable
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<ChampS_>
woooooow
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<EdwardIII>
hrm so if i install a gem like "gem 'sidekiq-promise'" i'd generally expect to be able to "require 'gem 'sidekiq-promise'" - reasonable? i'm seeing require': cannot load such file -- sidekiq-promise (LoadError)
<rfeyn>
In the top level of a ruby program, self is an object of class Object. What's the default definee in the top level?
<jhass>
rfeyn: Object, default method visibility is private
<EdwardIII>
havenwood: thanks!
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<rfeyn>
jhass: Is the default definee the singleton class of self in the top level?
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<jhass>
no, Object
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<treehug88>
mwlang: oh cool. Now you just need to add some sort of 'find' moral equivalent.
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<joncol>
What's a good way of accessing a Logger in Ruby? I want to be able to switch out the file log, used in a normal run of the program, with some mocks when testing.
<ChampS_>
jhass: strange, it only works when I do the rigth things xD
<atmosx>
joncol: you can create env variables and have your initialize method read the 'RUBY_ENV' variable. Then use Logger.new('/path/to/production.log') or Logger.new '/path/to/dev.log'
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<rfeyn>
jhass: So the default definee is the Object class? And all methods become private methods?
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<jhass>
yes
<chriscarpenter12>
Whats the easiest way to convert this string to an array: "[[1, product1],[2, product2]]" I'm scraping a url and the array returned is a string
<jhass>
chriscarpenter12: that's not defined to be in a particular format?
<chriscarpenter12>
jhass: I don't follow?
<jhass>
chriscarpenter12: looks like YAML parses your example
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<EdwardIII>
hmm not sure i can use sidekiq for this
<EdwardIII>
damnit this is way harder than i anticipated
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<treehug88>
i was just showing how it would be easy to confirm it looks like yaml without writing any code
<joncol>
Is there a way to detect if you're currently running RSpec tests?
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<jhass>
you shouldn't
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<SirCmpwn>
h
<SirCmpwn>
b high
<SirCmpwn>
god dammit
<SirCmpwn>
sorry
<jhass>
hi ;)
<SirCmpwn>
came here to ask what appeals to people about ruby
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<SirCmpwn>
my only exposure to it has been deploying a rails app and man, that sucked. What does it bring to the table that makes it super popular?
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<jhass>
I'd say a very open yet consistent type system, high introspection and metaprogramming abilities and a rich stdlib
<Coraline>
Add to that readability and conciseness
<jhass>
but judging Ruby from a Rails install is like judging Python from deploying Django
<ljarvis>
development speed, metaprogramming capabilities, decent testing tools
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<SirCmpwn>
except that deploying django is super easy
<SirCmpwn>
can you tell me more about ruby and metaprogramming?
<jhass>
I always find it at least equally hard
<new_student>
Hello All, I am a new student and have a question regarding my teacher's code. The code is checking Strings to see whether they are palindromes. Here is a link: http://www.pythontutor.com/visualize.html#code=def+FirstReverse(str%29%0D%0A++reverse_string+%3D+%22%22%09%0D%0A++i+%3D+0%0D%0A++while+i+%3C+str.length%0D%0A++++reverse_string+%3D+str%5Bi%5D+%2B+reverse_string(%29%0D%0A++++i+%2B%3D+1%0D%0A++end%0D%0A++return+reverse_string
<new_student>
I understand everything except Line 5
<new_student>
Thats the correct code^ I understand everything except line 4
<jhass>
?gist_usage new_student
<ruboto_>
new_student, To properly use gist, please enable syntax highlighting, either by choosing the language manually or by entering a proper filename. If you post multiple things, separate them into multiple files. If you have a Github account, please update your gist with new information instead of posting a new one.
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<jhass>
but got any specific question about it? It's not very idiomatic Ruby for sure
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<NullVoxPopuli>
anybody know why ruby rsa keys can't be imported by python?
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<NullVoxPopuli>
python expects the format of BEGIN RSA PUBLIC KEY, but ruby only exports BEGIN PUBLIC KEY
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<NullVoxPopuli>
figured it out, it was a difference between x.509 including information about what made the key, and python not doing that
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<metlx>
havenwood: Is RVM beneficial in any way?
<havenwood>
metlx: If you need more flexibility than those packages you can use an install/switcher like RVM to build your own Rubies. Or ruby-install is a simpler tool for installing Rubies and chruby for switching: http://ryanbigg.com/2014/10/ubuntu-ruby-ruby-install-chruby-and-you/
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<havenwood>
metlx: It works on obscure system with old Rubies that require patches to install.
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<Jason____>
Hi all, I have a beginner question invovling morphing strings
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<momomomomo>
Jason____: !ask
<momomomomo>
?ask
<ruboto_>
Don't ask to ask. Just ask your question, and if anybody can help, they will likely try to do so.
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<Jason____>
What is the best approach to transform individual letters in a given string to the next letter of the alphabet? I want to write this as a function
<Jason____>
In your code, I recognize all methods except .chars and the &:succ passed to .map
<Jason____>
Of course, I will look up documentation
<Jason____>
But I am a first time student, so perhaps you can Mr.Miyagi lecture me?
<pipework>
Jason____: You'll find #chars in String's docs, &:any_method uses Symbol#to_proc, which you can read about in that documentation, and #succ is also in String's documentation.
<pipework>
succ means successor.
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<rdavila>
I know that Hash.new { |k, v| k[v] = [] } solves the problem but don't know exactly how it works
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<pipework>
rdavila: You're modifying the array you're passing into the hash, not getting a new array for each new unknown key in the hash.
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<momomomomo>
rdavila: "If a block is specified, it will be called with the hash object and the key, and should return the default value. It is the block’s responsibility to store the value in the hash if required." http://ruby-doc.org/core-2.1.1/Hash.html#method-c-new
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<pipework>
If you do assignment as whale, you can store the value.
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<Zarthus>
shevy: yes they did.
<pipework>
But modifying the array destructively doesn't assign the key with the value's result, it just modifies the value. Any subsequent assignments that use the default value will use the array that you modified.
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<rdavila>
momomomomo pipework thanks a lot for the great examples
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<rdavila>
it was a bit tricky to understand on my won
<rdavila>
* own
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<pipework>
rdavila: no worries. Glad we could help.
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<momomomomo>
pipework: your example didn't show much up there
<pipework>
momomomomo: Sure it did. It showed that when you use the value returned from passing an unknown key into the hash and then assign a value to it, it uses the default value.
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<pipework>
Whereas, when you destructively modify the default value without doing assignment, it doesn't behave like one might expect.
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<momomomomo>
nah, your example just obfuscates
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<momomomomo>
it is useful to show how to set something to the default value, though
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<xelkarin>
I'm trying to write a user management script using ruby-ldap, and I'm trying to figure out how to change passwords.
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<xelkarin>
I've done this once before with a standalone EXOP command under Java, and while ruby provides controls for extended operations it seems these are only used to extend basic LDAP commands.
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<pipework>
xelkarin: Have you considered using jruby?
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<momomomomo>
jruby is dope, but you can't use apache spark with it :(
<xelkarin>
Actually, I haven't. I may look into it now.
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<xelkarin>
I'm guessing there's no way to do it under standard ruby though?
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<pipework>
momomomomo: Why can't you?
<pipework>
Spark is on the JVM, right?
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<momomomomo>
pipework: serialization etc
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<pipework>
momomomomo: I bet it can be done.
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<pipework>
If Spark is on the JVM, and since spark is open source, the limitation is that no one has done it, not that it can't be done.
<pipework>
momomomomo: I think that it's actually possible, but I'd need to check with the jruby team to see if I'm being silly.
<momomomomo>
doooo it
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<momomomomo>
I'd love to have a spark/torquebox cluster
<momomomomo>
rather than looking at scala/play framework
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<pipework>
I think that they wouldn't have to update spark to support jruby objects, but that someone would need to write code to serialize the jruby objects to what spark expects.
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<momomomomo>
I haven't looked to deep into it, because using scala/play won't be that bad if needed
<momomomomo>
or python/django or something
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<agent_white>
Afternoon!
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<BraddPitt>
if I have a loop running in a thread, is it possible to have that thread update a variable /outside/ of the thread scope while in the loop? Without joining to the main thread?
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<shevy>
BraddPitt isn't that what mutex is all about?
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<dotrb>
a want to convert adecimal range into hex bytecode, a la '\x3A' but (1..254).to_a.map &:chr isn't purely hex; it's escape sequences for the entire ascii encoding. whats the ideal way to do this?
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<darix>
dotrb: does that help?
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<darix>
otherwise pack/unpack can be your friends
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<dotrb>
darix: it does, thank you. although it seems like i remember being able to generate the whole ascii range in hex including the escap chars, like "\x01"
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<jhass>
dotrb: you're confusing representation and value
<dotrb>
darix: yeah, it was pack i used last time.
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<dotrb>
jhass: you're right, i see what yoou mean
<jhass>
do you want a byte sequences with the byte values 0 - 255 or do you want a string with two characters that when interpreted as hexadecimal map to 0-255
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<jhass>
*a two character sequence
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<dotrb>
jhass: i need a four character sequence, i just need the bytecode
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<seydar>
anyone going to rubykaigi?
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<baweaver>
Matz
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<havenwood>
seydar: Going to RubyConf but not going to make it to Japan.
<pipework>
havenwood: I bet you'd have a kickass time in Nippon (I can be such a weabo)
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<ecksit>
hey everyone, i'm trying to build a reusable http client for my gem and i've hit a snag. i'd like to be able to create a single instance of a "client" and then reference that from within other parts of my gem. see code sample at https://gist.github.com/anonymous/bd162bfd3f18feff2044. could someone guide me in the right direction to get the second part working?
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<havenwood>
ecksit: What does `client.user` return at the moment?
<havenwood>
ecksit: What have you tried to get it working?
<ecksit>
at the moment, just a string but i realise it needs to return an object to operate on
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<ecksit>
i've tried putting it into modules and including them from the client but i think i'm having issues with inheritence and passing on the variables i need
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<shevy>
BraddPitt cool, I hope you'll upload it when it works
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<BraddPitt>
most certainly will
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<Testo>
Hi all
<ecksit>
havenwood, i've found an example of how i want it to look to the person using it https://github.com/zendesk/zendesk_api_client_rb#usage (`client.tickets.some_method`) but i don't need the modelling associated with it
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<Testo>
can someone explain to me why this code out put `\n` after `without`?
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<Testo>
require 'yaml'¬
<Testo>
hasho = {:string => "Any changes you've made will be lost. Are you sure you want to continue without saving?"}¬
<Testo>
p hasho.to_yaml¬
<Testo>
"---\n:string: Any changes you've made will be lost. Are you sure you want to continue without\n saving?\n"
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<ecksit>
something in your editor Testo?
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<darix>
Testo: because to_yaml wants to keep a certain width?
<darix>
maybe proposed by the yaml standard
<shevy>
Testo yeah you have some hidden newline
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<ecksit>
apparently not - i get the same results
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<shevy>
>> >> require 'yaml'; hasho = {:string => "Any changes you've made will be lost. Are you sure you want to continue without saving?"}; p hasho.to_yaml
<ruboto_>
shevy # => /tmp/execpad-8222a2e27d81/source-8222a2e27d81:2: syntax error, unexpected >> ...check link for more (https://eval.in/452428)
<shevy>
oops
<shevy>
>> require 'yaml'; hasho = {:string => "Any changes you've made will be lost. Are you sure you want to continue without saving?"}; p hasho.to_yaml
<ruboto_>
shevy # => "---\n:string: Any changes you've made will be lost. Are you sure you want to continue without\n sa ...check link for more (https://eval.in/452429)
<shevy>
ohhh
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<shevy>
interesting
<shevy>
I am using syck
<shevy>
seems like a bug in psych then
<ecksit>
use `p hasho.to_yaml({:line_width => -1})` instead
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<ecksit>
that removes the additional new lines i was seeing
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<darix>
see setting
<shevy>
>> require 'yaml'; hasho = {:string => "Any changes you've made will be lost. Are you sure you want to continue without saving?"}; p hasho.to_yaml({:line_width => -1})
<ruboto_>
shevy # => "---\n:string: Any changes you've made will be lost. Are you sure you want to continue without savin ...check link for more (https://eval.in/452430)
<Ox0dea>
shevy: Why do you use Syck?
<darix>
Ox0dea: probably he is still on 1.8 ;)
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<shevy>
Ox0dea I have invalid yaml files and psych refuses to work with these
<Ox0dea>
shevy: Have you considered fixing the YAML files?
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<shevy>
Ox0dea yeah it is not possible
<Ox0dea>
Not with that attitude.
<shevy>
I told you how it is
<darix>
shevy: what did Aaron say when you reported the issue?
<shevy>
what issue?
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<Ox0dea>
The one causing your Stockholm syndrome.
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<shevy>
The one causing your annoyance syndrome.
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<Ox0dea>
Calm down.
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<shevy>
Calm down.
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<orion>
Hi. What's the return type of File.read in this line of code?: File.read(DATABASE).include?(code)
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<shevy>
File.read() itself should return a String
<shevy>
.include?() should return true or false
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<t0code>
i got everything working now. just keep forgetting to make sure im converting my objects to the correct format?
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<t0code>
.to_i etc
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<t0code>
someone here yesterday recommended to me to try to finish a program with all methods and no classes to understand why we use classes. just got it lol
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<shevy>
yeah
<Ox0dea>
>> self.class # t0code
<shevy>
once you have methods, it is easy to put them into a class
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<Ox0dea>
Doing or believing somebody else told you to with no rational justification.
<Ox0dea>
*something somebody
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<baweaver>
ritualization of code practices that serve no real purpose.
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<shevy>
t0code if the code works, create a new .rb file, with the very same code, and try to just make it into a class instead; the $ variable can easily become a @ variable instead, initialize it in "def initialize" for example
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<baweaver>
worst offenders: OO, Design Patterns
<t0code>
certainly am that
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<t0code>
so whats the proper way to declare an object such as a game character with a variety of variables and method?
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<Ox0dea>
t0code: A class.
<baweaver>
Also, use spaces instead of tabs
<t0code>
ok. thats where my efficienty conclusions came from.
<baweaver>
ruby indentation tends to be 2 space
<baweaver>
much easier to read.
<Ox0dea>
t0code: "Efficiency" is a loaded word.
<shevy>
it will be more efficient because it'll be easier to reuse as a class
<Ox0dea>
You want "productivity" in this case.
<Ox0dea>
baweaver: LLVM'
<Ox0dea>
3
<Ox0dea>
3
<Ox0dea>
That wasn't me.
<Ox0dea>
LLVM C is also two spaces, which caught me off guard.
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<atmosx>
hello shevy
<atmosx>
hello everyone
<shevy>
yo atmosx
<shevy>
did you finally get your degree
<atmosx>
shevy: how are you?
<atmosx>
shevy: no, I have to start studying for the state exams, 8/12
<atmosx>
shevy: it's the last exam, if I pass this, it's over no more exams
<shevy>
quite ok, I am about 20% done porting my last project from the ruby 1.8.x era
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<atmosx>
shevy: degre ein June 16
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<atmosx>
wow
<shevy>
and after I have finished I shall never never never ever again do any rewrite. ever
<atmosx>
I'm rewriting argosnap and writing my first rails project too
<atmosx>
haha
<shevy>
atmosx if you pass the state exam you'll get the degree?
<atmosx>
shevy: I could yes.
<shevy>
what do you mean you "could" :D
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<atmosx>
shevy: my thesis is ready, the states exams are ok. I will wait another 6 months but it's just ... waiting (if I pass) nothing more
<shevy>
hehe... those waiting times are so strange
<atmosx>
shevy: after thesis submition, I have to take the state exams. Once I pass the state exams, I need to 'present' my thesis and THEN I get the degree.
<atmosx>
shevy: it's a scheme I devised in order to make it 5 years
<atmosx>
shevy: otherwise would be 3.5 years which is not acceptable for MDPharm
<atmosx>
not in Greece
<atmosx>
in the UK it's fine
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<shevy>
so strange
<atmosx>
nor Italy, Germany, Austria (IIRC), etc.
<shevy>
yeah
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<atmosx>
shevy: the strange is that I managed to finnish earlier bascially...
<atmosx>
They let me take more classes per year
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<atmosx>
I did medicinal chemistry and analytical chemistry the same sem. You normaly don't do that. You take first analytical and then medicinal
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<t0code>
when is it appropriate to use a module?
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<nxa>
How does the coerce method work in ruby/
<Ox0dea>
t0code: Are you familiar with the notion of namespaces?
<t0code>
no, looking it up
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<t0code>
an idea of grouping related files/activities
<Ox0dea>
Sort of, but not quite.
<Ox0dea>
Really, it's right there on the tin; it's a space for names.
<t0code>
ok
<Ox0dea>
It's perfectly reasonable to exepct two different things to want, say, a Thing class, but they can't both have it, so they'd stick it in a module to disambiguate.