<tdump>
Hello. I'm having an issue with my code and I'm not sure why. I actually had it working earlier but it had some nested if/else and I thought it looked bad so I redid it, and now it's failing. Here's a gist https://git.io/v1zbK
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<tdump>
oh i got it
<tdump>
it was line 15
<tdump>
thanks!
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<P_R_Deltoid>
Is String interpolation allowed in Exception messages?
<P_R_Deltoid>
Like "raise "#{variable}""
<P_R_Deltoid>
Because I am trying to use rspec to test for an exception error message and it seems to be returning the literal string without interpolation
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<tjbiddle>
P_R_Deltoid: You’re using double quotes, as well as ensuring that the variable is intantiated and spelled correctly?
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<tjbiddle>
I’m unsure if variable scope is lost, so check that as well - or if it was instantiated before the exception was raised
<P_R_Deltoid>
yeah, I think I don't really understand how raising exceptions works
<P_R_Deltoid>
at least with rspec
<P_R_Deltoid>
I can raise an exception without using the begin and rescue keywords, right?
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<al2o3-cr>
P_R_Deltoid: yep
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<P_R_Deltoid>
Aww, I think this is just an rspec issue
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<dminuoso>
P_R_Deltoid: Raising has nothing to do with begin/rescue. All that the keyword rescue (it does not always require a "begin") does is set up a catch handler.
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<P_R_Deltoid>
Yeah, I was grasping at straws trying to figure it out
<dminuoso>
P_R_Deltoid: For rspec that means that you have to use the block form of expect, i.e. expect { code_that_throws }.to raise_error - rspec will wrap the execution of the blocks inside a begin/rescue for you.
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<P_R_Deltoid>
oh!
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<P_R_Deltoid>
That worked perfectly!
<dminuoso>
P_R_Deltoid: :)
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<P_R_Deltoid>
So am I correct in assuming that, because it was throwing an error in the code, and I wasn't using that form, it literally was just exiting the code with that error before Rspec could inspect it?
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<P_R_Deltoid>
or, catch it
<dminuoso>
P_R_Deltoid: Correct. :)
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<P_R_Deltoid>
perfect, thank you so much
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<alfy>
wassup
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<dminuoso>
P_R_Deltoid: Note that expect { code_that_raises }.not_to raise_error is sometimes considered an antipattern, because whether rspec will catch it inside the expect block, or whether the test just fails with an exception is the same.
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<dminuoso>
One just looks slighty better, but you expect any code you write inside an example block to not raise an error implicitly anyway.
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<P_R_Deltoid>
So you are saying don't use that pattern? Just test for certain errors if I need to, but otherwise assume that if a test succeeds, that it didn't throw an error?
<P_R_Deltoid>
In other words, testing for the lack of an error is a fruitless exercise?
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<dminuoso>
P_R_Deltoid: Indeed.
<dminuoso>
P_R_Deltoid: If some code raises an exception it will fail the rspec anyway, and rspec will still catch it - it will just present the error slightly differently.
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<jokke>
i need a container which is solely used for checking if elements are in it or not
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<jokke>
i don't need to iterate over it or nothing
<jokke>
should i use Set for this?
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<jokke>
would it be faster than Array?
<herwin>
depends on the number of elements
<jokke>
i see
<jokke>
number of elements is something between 10 and 50 probably
<jokke>
i assume include? on array uses binary search
<herwin>
no, it doesn't
<herwin>
there is a bsearch-method
<herwin>
because binary search only works if the array is sorted
<jokke>
oh you're right of course
<herwin>
set uses a hash-based lookup
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<jokke>
yeah
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<herwin>
inserting can be a bit more expensive, searching is faster
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<jokke>
i don't insert. i initialize it once with values
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<jokke>
or do a .to_set on an array
<herwin>
s/insert/initializing/
<jokke>
mmh
<jokke>
that's okay
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<jokke>
i reuse it alot
<herwin>
if you really want to know it: benchmark it
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<jokke>
yeah
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<herwin>
most likely this isn't the critical factor in performance and we're just bike-shedding here
<nowz>
Hellow im looking for the function with nokogiri that can help me to get the first <a> after the first <p> after the first <div class="content">
<nowz>
Could someone help me?!
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<Papierkorb>
nowz: #at_css
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<Papierkorb>
nowz: Or traverse the tree yourself, however, a CSS or XPath selector will be easier to understand I guess later on
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<antoniobeyah>
nowz: use xpath. something like (//div[@class=“content”]/p/a)[1]
<antoniobeyah>
dont trust the xpath u will have to google for it thats my rough guess
<antoniobeyah>
i havent done xpath in a couple years
<Papierkorb>
The CSS selector should be `div.content > p > a`
<Papierkorb>
Which is imho much easier to read than any xpath
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<Papierkorb>
Or maybe without the `>`, whatever you really need
<nowz>
thank you, im going to look after it
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<Minko>
hello, why did IronRuby die and isn't revived?
<Minko>
JRuby looks fine
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<gregor3005>
hi, can anybody point to to a gem which can read, edit and write xls files (version 97-2003)? there are lot of gem's out there but, some have bugs, others can't write and so on. it's frustrating finding one which work
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<Minko>
gregor3005: you could try converting in and out of xls
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<gregor3005>
Minko: by parsing the binary xls?
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<Minko>
you could just use something to convert it to another format, whichever you want, that's better supported
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<Minko>
I didn't work with excel much, perhaps even something like csv would do the job
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<mikecmpbll>
gregor3005 : i use the 'spreadsheet' gem but i don't do anything complicated.
<gregor3005>
Minko: ok, suppose there is a gem which converts from xls to csv and one which converts from csv to xls. which would you suggest?
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<gregor3005>
mikecmpbll: i only have to add values without any formatting style
<Minko>
gregor3005: I don't know any, it's just a suggestion. you could even use an outside converter for that
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<gregor3005>
mikecmpbll: the main goal is to write a tool which reads contacts from an carddav server and produce a xls for a crappy telephone system
<gregor3005>
darix: (16:03:22) gregor3005: mikecmpbll: the main goal is to write a tool which reads contacts from an carddav server and produce a xls for a crappy telephone system
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<darix>
gregor3005: i know
<mikecmpbll>
gregor3005 : i mean https://rubygems.org/gems/spreadsheet ; whether or not that's the github repo for that gem i'll leave you to work out
<mikecmpbll>
but yeah, that'll do the job for you.
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<gregor3005>
mikecmpbll: please calm down, it was only a question. leave this channel if you like to diss people
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<mikecmpbll>
gregor3005 : pardon? i'm perfectly calm, i'm not sure how you got the impression otherwise.
<gregor3005>
ok
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<antoniobeyah>
Papierkorb: agreed, the css is seems easier. didn’t know you could do that
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<Gasher>
hello, I have a problem. when I made a shortcut/link to my Ruby program, the __dir__ variable broke, pointing to the shortcut, and not the original file. how can I fix it?
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<apeiros>
either don't rely on __dir__ or resolve it to the real path
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<Gasher>
what else can I rely on?
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<apeiros>
I don't know what problem you solve with __dir__.
<Gasher>
just getting the program's folder's path
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<apeiros>
that's not the problem you solve.
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<Gasher>
hm?
<apeiros>
what do you need the program's folder?
<apeiros>
*why
<Gasher>
because it consists of many other files
<Gasher>
that are needed for the program
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<apeiros>
ruby code?
<apeiros>
data?
<apeiros>
other?
<Gasher>
data - config files, different kind of storage
<apeiros>
is your program a gem?
<Gasher>
nope
<apeiros>
why not?
<Gasher>
and some "other"
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<Gasher>
it's not designed to be one
<Gasher>
and I've never made a gem
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<apeiros>
proper way IMO:
<apeiros>
make it a gem
<apeiros>
use gem's datadir
<apeiros>
have an initial config there, copy it per user
<apeiros>
have and keep your immutable datafiles there
<Gasher>
won't work here
<apeiros>
mutable datafiles again, copy per user
<apeiros>
well, too bad then.
<Gasher>
so no nice solution to that?
<apeiros>
to "doesn't work". no.
<apeiros>
I have no solutions for that kind of problem.
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<Gasher>
what do you mean?
<apeiros>
precisely what I said. I have no solution to "doesn't work".
<Gasher>
I didn't say "doesn't work", I said "points to the shortcut instead of the original file"
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<apeiros>
no. you said "won't work here".
<Gasher>
it's not that kind of software that would be a gem
<mustmodify>
apeiros: I do! I do! Smash it with a hammer!
<apeiros>
Gasher: I have no idea why you think that and I currently lack the desire to ask or even argue about it.
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<SebastianThorn>
if you have a script that generates code that your lib usese, any special way i might wanna commit that code to git, or does it just not matter? 64k lines
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<baweaver>
Gasher: Consider a gem just to be a project structure / packaging system.
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<baweaver>
There's no real reason you can't use it for even projects you never intend to "publish" to the world
<havenwood>
Gasher: If it's not an app it's a gem.
<baweaver>
havenwood: Apps can be gems too.
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<baweaver>
in fact it makes it way easier to deploy / publish later, especially if you have an internal gemserver to use.
<havenwood>
baweaver: My logical syllogism didn't exclude that. :-P
<baweaver>
fine fine
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<apeiros>
logical syllogism - it gets to greeky in here. I'll go ^^
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<baweaver>
SebastianThorn is it necessary for the application to run?
<baweaver>
or is it just generated at whim for whatever usecase?
<baweaver>
In the first, yes, commit
<baweaver>
In the second, .gitignore
<SebastianThorn>
baweaver: yes, it is needed for the application, thanks
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<townes11>
I'm a bit new to the OOP way of doing things. I'm working through a tutorial...we change a user file so that it displays a first and last name, not just one 'name'. https://gist.github.com/anonymous/eeabfd5b2d7161e15b066944f96f46c1 <---- this code fails, and I see that the 'full_name' method isn't being seen inside other methods, I guess.
<townes11>
I'm a bit new to the OOP way of doing things. I'm working through a tutorial...we change a user file so that it displays a first and last name, not just one 'name'. https://gist.github.com/anonymous/eeabfd5b2d7161e15b066944f96f46c1 <---- this code fails, and I see that the 'full_name' method isn't being seen inside other methods, I guess.
<townes11>
Honestly, I'm not entirely sure. This is new to me and I'm unsure of a right way to accomplish this, and I have an idea of why it's failing but I don't totally understand it
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<toretore>
townes11: how does it fail?
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<townes11>
toretore: it's actually through rails console. Okay, so I require this file ("./example_user") I'm able to add a user with these attributes
<townes11>
But a final part of this section is to see if full_name.split and alphabetical_name.split(',').reverse give the same output
<townes11>
Sorry a little slow on the keyboard today heh
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<toretore>
townes11: go back to the part where you implement full_name and alphabetical_name: if the test you gave is supposed to pass then you have implemented them wrong
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<miah>
ya, that code works fine so test must be broken
<townes11>
Hmmm
<toretore>
it won't pass because there's no comma in full_name
<toretore>
when facing something like this, work backwards: inspect the output manually to see if it is actually the same
<townes11>
Oh wow. I've been so focused on just verifying it (I get nameerror undefined local var etc) That I didn't even look to see if it would actually verify if it worked
<toretore>
oh wait
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<toretore>
full_name.split without arg; well it still won't be the same because the other one is ',' and not ', '
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<townes11>
Okay thanks everyone. I'll work backwards and focus on this part after. I dunno, I really felt like I messed up the class somehow
<toretore>
townes11: are you confused about `user.full_name` vs just `full_name` or `full_name(user)` ?
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<townes11>
Haha actually I tried all, honestly, because I wasn't sure the way to call it (I assumed: user.full_name)
<toretore>
yes
<toretore>
you have defined a class, with instance methods
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<toretore>
to run any of those methods, you must first create an instance of the class
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<townes11>
Yeah. user = User.new(....)
<toretore>
every method call in ruby has an explicit or implicit receiver, which is `self` inside its own scope
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<toretore>
between `def something` and `end` you are in instance scope
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<toretore>
outside that, it's something else
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<toretore>
anyway, all of this is something you should learn following a basic ruby tutorial
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<townes11>
It's my fault, I'm like half comprehending when you start talking about explicit/implicit receiver
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<townes11>
The concepts are a little foggy to me. I need to work on that
<toretore>
that's something you are going to have to learn at some point
<toretore>
otherwise you won't get very far
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<townes11>
Yeah. It's been a real problem so far. Alright look thanks for your help, I'm gonna run and try to work through this
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<toretore>
np you'll get it eventually
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<miah>
http://poodr.com/ really straightened out my oop/ruby knowledge
<townes11>
I hope so. Thanks. Take care toretore
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<townes11>
miah: bookmarked, I'll check it out tonight. This is a serious problem I've been having and I'll try anything lol
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<townes11>
Later :)
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<bigtawm>
Hey is ruby good for learning data structures and algorithms? Im taking a datastructures class next semester, and we can use any language we want. I'm on the fence between Java and Ruby. Ive been using Java in school, but using Ruby outside of it.
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<miah>
i've learned quite a bit from that
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<bigtawm>
I have seen that site I was going to work through it over break. I think Ill go ruby, but I'm not sure if it will give me a crutch when doing the projects
<atmosx>
bigtawm: doesn't the class enforce a language?
<atmosx>
I've seen courses using java, c++, python and C but never ruby
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<jidar>
c++/java is typically what I see
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* jidar
cries over all the null pointer errors he saw in C++
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<bigtawm>
No he doesnt enforce a language, but he said most people continue to use Java. Would java give me a better understanding of data structures or is it all the same?
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<jidar>
imho, it's entirely what you make of it. the datastructures can be represented in any language. I'd personally pick the one you're most familiar with rather than something new
<Rich_Morin>
I'm trying to set up log filtering on Sinatra, but it isn't working as expected. Help? - see http://pastie.org/10979589 for details.
<jidar>
that way you won't be fighting the language and the class
<havenwood>
bigtawm: <3 Ruby
<bigtawm>
I probably have the same amount of familiarity with java as I do ruby
<havenwood>
bigtawm: Give JRuby a look as well.
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<havenwood>
It's a great Ruby implementation on the JVM.
<bigtawm>
Ive heard of that is that were you can compile ruby using a jvm?
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<havenwood>
bigtawm: There's a #jruby channel for JRuby specifically.
<bigtawm>
Oh thats cool Ill look into that I heard of it, but have never tried it out
<bigtawm>
So I wont be cheating myself if I choose ruby thats all that I care about since I want to get the most out of the class
<jidar>
not any more than you would with java imho
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<bigtawm>
Okay sweet Im working up to doing web dev with rails, so I figure data structures in Ruby would be the best choice Ill do that then
<havenwood>
bigtawm: I think Ruby is a great language to learn. It's multi-paradigm with some fun functional stuff and has an interesting object model.
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<jidar>
there's likely already a implementation of any data structure in any language you'd use rather than writing your own anyhow
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<havenwood>
"If you want a language for easy object-oriented programming, or you don't like the Perl ugliness, or you do like the concept of LISP, but don't like too many parentheses, Ruby might be your language of choice."
<jidar>
so make sure you just understand the concepts in that class
<havenwood>
~ Ruby manpage
<bigtawm>
Yeah I started learning Ruby while taking this OO design class and its much nicer to work with than java to learn haha
<bigtawm>
Yeah its just to understand how the data structures work under the hood correct?
<jidar>
yes. You should know when to use a linked list vs an array and all that
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<havenwood>
bigtawm: Ruby Under a Microscope is a good book to read.
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<bigtawm>
Im reading beginning ruby from novice to professional right now any opinions?
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<bigtawm>
Does it show how ruby preforms all its abstractions? Looks like a good read
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<bigtawm>
I have to check out those books for my next read thanks
<bigtawm>
I'll
<jidar>
not sure what you mean, like how it works with it's native types and all that? Might be better to follow up on what havenwood mentioned if that's your interest
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<bigtawm>
I just looked at well grounded rubyist on amazon would that be a good follow up to beginning ruby? haha sorry for all the questions
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<jidar>
I think so
<havenwood>
bigtawm: Just get the Second Edition of Well-Grounded Rubyist since it covers modern Ruby. It's a good book for covering the basics.
<jidar>
it's broad
<bigtawm>
When should I start thinking about learning rails?
<bigtawm>
Im up in northern california going to school and trying to get my foot in the door for an internship so I feel like some rails work would help
<havenwood>
bigtawm: I'd say after you have a working knowledge of Ruby and have made your own basic Rack app and tried a few of the simpler-than-Rails Rack adapters like Sinatra and Roda.
<bigtawm>
Okay sounds good Ill look into that next then
<Rich_Morin>
I'll try to create a minimal example.
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<toretore>
you are probably getting output from various libraries; i've used some that just have straight puts at various points in their code and you can't get rid of it
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<Rich_Morin>
Well, this looks like a pretty vanilla HTTP request log message; I'd expect a random library to generate something else...
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