<havenwood>
tefa: exercism has some nice problems and you can run it on your own computer
<guacamole>
ruby koans too
<havenwood>
but alas
<havenwood>
It's in English.
<rubycoder37>
so I have this CSV with this code: https://gist.github.com/anonymous/3dc4a9bd1d53677708b2c11a688f6441 notice how the 'expected output' has a specific hierarchy with the name and the combination of the currency/amount, I know the basic of reading a file and converting CSV to JSON but I don't know how to achieve this format
<havenwood>
tefa: You might have less trouble with the English in exercism or koans than you're having with the opaque Ruby service.
<guacamole>
rubycoder37 have you worked with hashes before?
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<rubycoder37>
guacamole: yes
<guacamole>
so you just need construct a hash, and compare the name column against the keys in the hash to decide if it already exists. if it does, add another value to "wallets" if not add the key and the "wallets" nested hash key and relevant wallet info
<guacamole>
does that help? or something specific not working you can point me to?
<weaksauce>
what's the expected output when there is more than one client?
<weaksauce>
just an array of hashes?
<rubycoder37>
yes
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<weaksauce>
tefa do you have the method signatures that they are expecting to use?
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<weaksauce>
because without seeing the call site it's tough to say which one is messing up
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<weaksauce>
rubycoder37 try using map then on each of the lines in the csv. each time constructing the hash that looks like the json output. something like the_lines_array.map do |line| {name: line[:name], wallets: {each of the wallets}} end
<weaksauce>
but of course you need to modify it to actually work
<weaksauce>
actually you can't do that because you need to aggregate over lines
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<tefa>
weaksauce I can only use the code inside the actual code... and (max, min, all?, any?, select, find, push, delete, and some others) not any other...
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<rubycoder37>
weaksauce: sounds good, I'll do that, thanks
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<weaksauce>
tefa do you have a link to the problem?
<havenwood>
rubycoder37: Not sure if I followed what you want, but consider: require 'json'; require 'csv'; headers, *rows = CSV.read('wallet.csv'); rows.each_with_object(Hash.new { |h, k| h[k] = {} }) { |(client, currency, amount), h| h[client][currency] = amount }
<tefa>
weaksauce thats everything.. actual the Zombie module Bouba whats the previous exercise, on this new exercise I only created the human, Juliana, so the website its using the zombie module from the previous exercise, thats why I uploaded everything to the gist, maybe the error its on the zombie module...
<tefa>
weaksauce yes, its on a public site, this is the site: mumuki.io
<tefa>
weaksauce even if you enter directly to mumuki.io and you log in.. you can go directly to the exercise by going to Chapter 5 Programación con Objetos, then to Lesson 6, exercise 1
<havenwood>
rubycoder37: commented on your gist
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<rubycoder37>
havenwood: wow! thanks for this, trying your code
<weaksauce>
tefa trying to log in but it's slow
<havenwood>
Waiting for mumuki.io...
<tefa>
weaksauce it isnt slow... first time its failing.. ever...
<tefa>
weaksauce it never been... first time. dont know why
<mikhael_k33hl>
Is there a method to extract only the key from a hash?
<havenwood>
mikhael_k33hl: #keys
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<mikhael_k33hl>
havenwood: that returns an array, what if I know it only returns one value?
<havenwood>
mikhael_k33hl: you just want to check if the Hash has a single key and get a bool back?
<mikhael_k33hl>
havenwood: Looking into the docs, I think that's the only one
<mikhael_k33hl>
havenwood: Sorry for the confusion, I meant I know for sure that the hash will only have one key/value pair hehe
<havenwood>
mikhael_k33hl: There isn't a single method for that purpose, but #keys then #first should do the trick nicely.
<havenwood>
#first then #first also works
<weaksauce>
is it guaranteed to be that many elements always or can it fail at some point by having 0 or more than one or be nil?
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<mikhael_k33hl>
havenwood: thanks man
<weaksauce>
tefa seems like I can't log in sorry
<tefa>
weaksauce im not pretty sure if I understand you.. but by experience I can tell that the site, usually knows the errors you can have...I have had others errors before, including nil ones..
<weaksauce>
tefa that was for mikhael_k33hl actually
<tefa>
weaksauce oh xd
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<tefa>
weaksauce it cant be true :( just when Im getting help, website fails... never failed before.. never... they are conspiring against me...-.-
<tefa>
weaksauce now its working... I log off and re log and it works... yes it takes a minute but it does now..
<rubycoder37>
havenwood: your example worked great, thanks
<weaksauce>
perhaps it is an issue with implicitly passed in self? i can't recall the rules on that
<weaksauce>
tefa ^
<weaksauce>
also, i can't read spanish
<holis>
Dont know what it means implicity passed in self..
<holis>
(Im eating.. im tefa.. with my cellphone xd)
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<holis>
There isnt much to understand...but if you want I can translate evrrything for you
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<weaksauce>
holis does the code need to be a module and does it need to be `self.` methods?
<holis>
Yes..its the only way I have been using till now.. only modules like the code i shared... and defined self.blabla
<holis>
So i can execute them or give them orders..
<weaksauce>
> Esto es lo que se conoce como error 500 .
<weaksauce>
server error when i try to log in. it's probably just poorly written tests on the backend
<holis>
Im sorry about that.. like i said never failed before :(
<holis>
The thing you wrote in spanish means.. This is what we know of error 500
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<weaksauce>
oh you know what, holis it is probably expecting the module or object to be passed into attack!
<weaksauce>
try adding another variable as an input and see what happens
<weaksauce>
this seems to be too vague to be all that useful
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<holis>
You mean for example... on def self.attack(x) under it write something like @hello = x ? Insted of the order i gave?
<weaksauce>
def self.atacar!(damage, hero) or def self.atacar!(hero, damage)
<weaksauce>
and then hero.recibir_danio!(damage)
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<weaksauce>
that's about the only thing that makes sense
<holis>
I got you.. will try that right now
<holis>
I got your point.. and think you are right
<weaksauce>
good luck
<tefa>
weaksauce iuuuuuhuuuu haha
<tefa>
weaksauce fki*** site, didnt told me that...
<tefa>
weaksauce xd, guess woulda be 2 easy...
<weaksauce>
yeah. not having the method signature provided for you is crazy
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<tefa>
weaksauce changed to def self.atacar!(zombie,x) and insted of Bouba.recibir_danio!(x) used zombie.recibir_danio!(x), workd :D
<weaksauce>
nice!
<tefa>
weaksauce but now i learned something... everytime or pretty sure most of them, the website want to correlate something.. or link.. it will use a second var or similar.. to the clare the other object or module.. etc
<tefa>
declar*
<tefa>
declare*
<tefa>
weaksauce I will finish eating now, thanks for the help, and for re trying help.times {solve error} xd
<weaksauce>
no problem tefa
<weaksauce>
tefa you might want to just do something easier like @salud -= 2*x instead of x.times as it's a bit more idiomatic to do it that way
<weaksauce>
also a good habit to get into to name the variables more in line with what they do
<weaksauce>
so x could be called num_of_strikes or something like that
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<holis>
I usually do, but I dont like long names..and when i recode the code, trying to solve the error.. i change names to short things so i can change them quick.. and dont lose time writing dictionary xd
<weaksauce>
it will probably save you more time in the long run to do it right though. glad it's working though
<holis>
And my code only longs the time the website want to.. so.. i dont care too much xd but when i do my final code... for example for a work of myself.. a program.. or a test in the school.. i would be super explicit and understandable legible
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<tefa>
weaksauce but yes, I dot what you say :D
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<tefa>
and weak, using x.times whas me having fun... I know I can use x*2 .. but knowing they dont let me use too much code... I play with it sometimes... doing easy things complex and complex easy.. xd I learn from the error too
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<weaksauce>
:D
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<weaksauce>
there's an old saying that you need to be 2 times as smart as the code to debug it so if you write the most clever code you can, you are not smart enough to fix your own code
<weaksauce>
something along those lines
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<mikimouse22>
hi. im trying to setup passenger module on top of nginx but all the files I'm requesting are returned in plain text instead of parsed by ruby. i don't know how to debug this problem
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<tefa>
haha true.
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<tefa>
the virtual classroom just teach me how to use a Class.. and how to just "def" xd
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<tefa>
why is there so many people in this chat room and noones chat?
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<SkyFire>
Can someone help me with routing ruby? i know very listtle ruby but this is a simple path routing issue that idk how works
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<gizmore>
SkyFire: rails?
<SkyFire>
umm
<SkyFire>
yes?
<SkyFire>
i literly like dk ruby at all
<gizmore>
wrong channel. query me if you like
<gizmore>
or try #rails
<SkyFire>
ik html, and java, and some C# so im familiar with code
<SkyFire>
i have no clue which ruby im using
<SkyFire>
i installed something form the ruby website
<gizmore>
try ruby --version
<SkyFire>
i get: ruby 2.4.3p205
<SkyFire>
and a date
<SkyFire>
and [x64-mingw32]
<SkyFire>
so the line of code im working with (that works) is: get 'massage_Alhambraaa' => 'static_pages#massage_Alhambraaa'
<gizmore>
calls massage_Alhambraaa in static_pages controller, iirc
<gizmore>
but better ask in rails
<gizmore>
also feel free to pm me
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<gizmore>
this channel is more for core ruby
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<SkyFire>
ok, im new to both rails and ruby
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<weaksauce>
SkyFire it's actually #rubyonrails unless there was a fracture of the channel
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<tefa>
im actually needing help again, anyone ? :D
<tefa>
weak? xd
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<tefa>
Can anybody help ? im getting this problem https://i.imgur.com/tbihkLb.png as you can see class Sobrevivientes its already declare.. and in the second exercise i just added another method...following the steps the exercise asked for. as you can see in Sobrevivientes there is a method called atacar! and it uses recibir_danio!... my exercise worked and pass the test.. but there is something not
<tefa>
quite complete... it says that my program worked but i have to use "recibir_danio!" in atacar!... so its weird.. cause i already used.. as you can see on Sobrevivientes class.... what could it be wrong ? thanks in advance
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<tefa>
nvm, solved it
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<tefa>
anyone want to chattt
<tefa>
xd
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<daaaave>
Hey, I’m pretty new to ruby and I’m writing some rspec. I noticing that I am repeating myself like crazy in tests. Is there a way to improve this so the first 4 lines are more concise? https://pastebin.com/feubvU2k
<dminuoso>
daaaave: You can use @let to lazily memoize the construction of item/items/blumen
<dminuoso>
err *let
<dminuoso>
Well what tbuehlmann said =)
* dminuoso
pokes tbuehlmann with an adjoint functor
* dminuoso
grins as tbuehlmann is trying to figure out whether its left or right adjoint
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<tbuehlmann>
I'm at least one step ahead of you since I don't know what a functor is, nor whether it's left or right
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<dminuoso>
tbuehlmann: As far as you as a programmer are concerned, a Functor is anything you can .map over.
<daaaave>
oh, interesting, is there a way to use pass different args into the let in the it 'bars'?
<dminuoso>
Array or Tree are examples.
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<dminuoso>
Hash too, there's just called "transform_values"
<dminuoso>
*there it's
<damasceno>
Hello. I've just finished my first ruby app and I would like to know if there's a way to create a single file to execute the app, like a simple .exe (But in this case, for Linux).
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<damasceno>
Something similar to the .jar from Java
<dminuoso>
damasceno: There's traveling Ruby. Generally it's far easier to just require ruby to be installed.
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<tbuehlmann>
daaaave: you can use contexts to change the lets, if that's what you mean
<dminuoso>
damasceno: Or if the dependencies get more complicated to ship your app inside a docker container
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<damasceno>
dminuoso: sorry, I didn't get it. The problem is: I need to tell the user to install the following gems: a,b,c (This is fine), but then I have to tell him to copy the 6 ruby (.rb) files from the application. I think it's easier to tell the user to install the gems, download the binary file "application" and execute it. Is there a way to do that?
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<dminuoso>
tbuehlmann: In my Q library for example there's a module called Functor. Everything is implemented in such a way, that if you have any class that satisfies: obj.is_a?(Functor) then you can blindly use .map { |a| ... }
<daaaave>
tbuehlmann: alright, that's helpful
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<daaaave>
thanks dminuoso and tbuehlmann
<tbuehlmann>
dminuoso: great
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<dminuoso>
damasceno: Gems are managed with bundler.
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<dminuoso>
damasceno: That "copying ruby files" sounds a bit weird. Why exactly does the user need to copy ruby files?
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<damasceno>
dminuoso: It's an open-source project, I have 6 files (Because I wanted to split instead of putting the entire code in one single .rb file, I don't even know if that's good, xD), so I'm going to upload these files to github and the user will need to download these files and then install the gems and then execute the main.rb file, no?
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<damasceno>
That's what I did with another computer, to make sure it works in Mac and Linux
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<dminuoso>
damasceno: So one way do this is: Include a Gemfile (this is for bundler), and then the installation instructions is:
<damasceno>
Please let me know if there's an easy way, I just started with ruby =T
<dminuoso>
"git clone blah; cd blah; bundle"
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<dminuoso>
And then everything is done.
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<dminuoso>
damasceno: Or you build a gem.
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<dminuoso>
damasceno: That is the ideal way, because then it just boils down to "gem install blah" assuming you published it on rubygems.org
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<damasceno>
Hum, I'll check that to see what's the easiest way for the user to execute it. Thanks for your help =)
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<damasceno>
So you think building my own gem is easier for the user, right?
<dminuoso>
damasceno: Yes.
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<damasceno>
Will do that then, thank you very much :)
<dminuoso>
damasceno: Here's how you use rails: `gem install rails`, you wait a moment, and then you have the `rails` executable available. =)
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<damasceno>
Yes, that's exactly what I want
<damasceno>
:D :D
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<rapha>
hi
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<jhass>
hi
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<rapha>
in https://gist.github.com/sixtyfive/2180574730f3f2f28ee1532639c9a9f3 , the gets in line 7 only works the first time through the loop. Beginning with the second time, it never waits for that user input and skips to the gets in line 11 instead. What am I doing wrong?
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<jhass>
mh, I'm surprised it gets to the second one even, since Ctrl+D/EOF closes the file descriptor
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<jhass>
ah, nvm I misread
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<jhass>
maybe it has to do with the mismatch between STDIN.gets("EOF") and html.include? "EOI" in the next line?
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<rapha>
jhass: i mean different things by EOF and EOI
<rapha>
but perhaps i should think of my own magical markers instead of using ones that are more or less commonplace
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<rapha>
jhass: so i changed them from "EOI" and "EOF" to "DONE" and "NEXT" but that doesn't help.
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<jhass>
I would add a p(name) between ll. 7 and 8 to see what the value is when it's "skipped"
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<jhass>
I guess your terminal is line mode so there's a trailing \n left which the second gets in the first loop doesn't consume
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* dminuoso
consumes an apple
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<rapha>
jhass: updated the gist with the script's output and indeed there's now a newline between the two print() outputs so it looks like you're right. what's the remedy though? is there some sort of buffer clear method?
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<rapha>
dminuoso: much health to you!
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<jhass>
well you could just require the newline and do gets("NEXT\n")
<pavelz>
so what is the deal with .try(:[], b) command why :[] Symbol is used ?
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<jhass>
to call the [] method, foo[b] is just syntax sugar for foo.[](b)
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<pavelz>
oh lol ok thanks.
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<rapha>
jhass: finally!!!! thank you a million times! after three days it works!
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<dminuoso>
pavelz: methods are identified by symbols (in fact the entire reason for symbols existing is to identify methods and other things)
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<dminuoso>
pavelz: So the correct way to refer to a method is by a symbol. =)
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* rapha
wanders off happily to get a good nap in
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<jokke>
hey
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<jokke>
how can i find all classes that include a certain module?
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<jhass>
ObjectSpace.each_object(Class).select {|c| c.ancestors.include? Mod } something like that
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<jhass>
if you control the module it might be better to keep a tailly via the included hook
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<jokke>
oh hi jhass!
<jhass>
but I hope this is just for debugging anyway
<jokke>
long time no see
* dminuoso
thinks jokke could have thought of this himself
<jhass>
yeah :P
<jokke>
yeah i thought of using the included hook
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<jokke>
unfortunately not for debugging purposes
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<dminuoso>
jokke: That wont catch builtins
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<dminuoso>
Or prepended things
<jokke>
it's a active support concern
<jokke>
very limited use
<dminuoso>
jokke: Those "concerns" are just plain old modules with some minor sugar
<jokke>
yeah
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<jokke>
but they're used in a very limited context
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<dminuoso>
jhass: Also.. ancestors.include? ? :(
<dminuoso>
What happened to you?
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<jhass>
nothing :o
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<jokke>
dminuoso: he's on the crystal side now!
<jokke>
:)
<dminuoso>
Oh
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<dminuoso>
jhass: Does Crystal have some dirty ObjectSpace backdoor to find anything, including next years christmas presents?
<jokke>
how would i best register the including classes? class var? class instance var?
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<jokke>
dminuoso: crystal has awesome macros :)
<dminuoso>
jokke: class variables are almost always the wrong choice. ;-)
<jhass>
dminuoso: no :(
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<jokke>
dminuoso: which ones were the ones that get inherited, again?
<dminuoso>
jhass: macros in what sense? in the sense of elixir rewriting ASTs?
<jhass>
class level instance var seems about right
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<jokke>
dminuoso: yeah
<dminuoso>
jokke: class vars have that inheritance behavior which makes them kind of weird
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<jhass>
well, you read from the AST to produce new code that's fed back into the parser
<jokke>
dminuoso: you can even compile and run whole programs that will generate code which will be replaced for your macro
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<jokke>
it's really powerful
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<jokke>
but like rubys metaprogramming it can get very "magical" very fast
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<jokke>
dminuoso: ah yeah ok
<dminuoso>
jokke: a class "instance" var otoh is nothing special. It's just a regular instance variable.
<jokke>
yeah
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<dminuoso>
jhass: fun fact, did you know that ruby uses a stack machine to dynamically at runtime determine the nesting?
<dminuoso>
I recently learned this myself.
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<jhass>
tbh i don't even know what a stack machine is
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<dminuoso>
jhass: something that uses a stack to maintain state. at certain code regions Ruby just emits a "push XYZ onto nesting stack", and at other code regions Ruby emits a "pop whatever is on the current stack"
<jhass>
oh, do you just mean the datastructure that's often available as "stack", that is a pop/push optimized array?
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<jhass>
ok
<dminuoso>
Originally I thougth nesting was lexically determined
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<jhass>
ah
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<jhass>
I see
<dminuoso>
And then I learned that `class << a` and `instance_eval(str)/class_eval(str)` push the respective class dynamically
<ruby[bot]>
dminuoso: # => #<Class:#<String:0x422e1b88>> ...check link for more (https://eval.in/956328)
<dminuoso>
Apparently Integer doesnt have singleton classes.
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<dminuoso>
jhass: ^- and this is the surprising bit. This only happens if you use the String form, but not the block form.
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<jhass>
haha
<jhass>
how dare you to wish for consistency
<dminuoso>
>> class << foo; puts Module.nesting; end
<ruby[bot]>
dminuoso: # => undefined local variable or method `foo' for main:Object ...check link for more (https://eval.in/956330)
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<dminuoso>
>> class << "foo"; puts Module.nesting; end
<ruby[bot]>
dminuoso: # => #<Class:#<String:0x41355b24>> ...check link for more (https://eval.in/956331)
<dminuoso>
So this gives you a backdoor to create an arbitrary nesting stack. Its fun.
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<dminuoso>
jhass: Yeah indeed. So did you ditch Ruby for good?
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<jhass>
nah, just not actively using it for anything beyond slack bots currently
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<dminuoso>
But using Crystal otherwise?
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<jhass>
for hobby projects yeah
<dminuoso>
What do you use professionally then?
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<jhass>
currently Android apps
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<dminuoso>
Sounds like Java or possibly RN
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<jhass>
Java, think I might try Kotlin for the next small enough thing possible, KTX looks promising
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<jhass>
RN is terrible :P
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<sheepofdoom>
jhass react native?
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<jhass>
yeah
<sheepofdoom>
yeah, it is
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<sheepofdoom>
I was wondering how complicated it might be to migrate a project from using celluloid to concurrent-ruby? I know it depends on the project but some best practices, hints or advices would be appreciated.
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<kspencer>
Is there an easyish way to read files that are in a installed gems src, like Thor long_desc files for options
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<jhass>
pry
<jhass>
show-source / $
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<kspencer>
pry doesn't quite help me inside a running script without debugging it
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<dminuoso>
jhass: You should try Clojure =P
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<dminuoso>
With homoiconicity you get the power of macros but as a first class feature!
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<jhass>
so yield is just how your own methods can take and invoke a block
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<zleap>
ah ok so i invoke(call) a block from within a block
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<jhass>
a method is not a block
<zleap>
ok
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<jhass>
similar granted, but not the same
<zleap>
method is like y*2
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<zleap>
i am trying to work out where the variable num is created in that code example
<jhass>
a method definition is the def foo(x); end thing
<zleap>
ah ok
<jhass>
it's the argument, (num)
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<zleap>
and the block is the bit in themiddle
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<jhass>
the block in your example is {|x| puts x * 2}
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<zleap>
yeah
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<zleap>
i guess i am thinking python where num is the variable holding what ever value you are passing to the block and back to the code that called it
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<zleap>
as in that code it calls num, but then does nto use num explicitally in the method
<jhass>
num is nothing you can call, it's just a variable holding the integer 16
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<elomatreb>
It effectively works like a method argument, you cannot change a in the method from the block
* kspencer
also wised up and put the descriptions into a file and made them part of the module
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<h00d>
Hi guyz[
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<zleap>
jhass: thanks,
<zleap>
i need to do more reading, i have nearly 70 pages of copy / paste notes for this
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<karl___>
I'm using Net/Http to send a web request. The webserver is replying with a messed up header in the response, and I can't access the header via response.header. Is is possible to get the raw http response from net/http?
<jhass>
I doubt it, but I could imagine you can get the raw request and fire it to your own TCPSocket
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<headius>
arahael: you'll get used to it :-)
<headius>
although Matz prefers people say "CRuby" now
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<banisterfiend>
anyone here have experiences shipping a binary in a ruby gem?
<banisterfiend>
i mean an actual binary, not just an executable ruby file, and something i don't want on the load path, just a binary to be used internally by the gem
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<havenwood>
banisterfiend: the wkhtmltopdf-binary gem is one that comes to mind - but I'm not sure how nicely they've done it
<banisterfiend>
thanks i'll check it out
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<banisterfiend>
havenwood cool they hvae a libexec/ folder
<banisterfiend>
i'll try tht
<banisterfiend>
fucking 'etags' is different on different platforms and linux versions, it results in differenly formatted output :/
<banisterfiend>
so i have to ship my own etags binary
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<aeyxa>
I'm using this .each thing on a list divided by a number, how can I check for remainders with it?
<aeyxa>
yeah but how do I do remainder of the .each iteration?
<aeyxa>
inside the loop?
<aeyxa>
do I do it on the variable the split array is assigned to?
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<aeyxa>
gonna just do a try except when it fails instead...
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<conceivably>
Hi there. I would like to do some transformations on an object that internally has a structure that resembles a tree (i.e. it may have children and it may have a parent reference). At the same time I would like to keep a copy of the original object intact. Since the object is nested, clone won't do. I've tried using Marshal to duplicate the object, but that doesn't work under some circumstances. Given how difficult/hacky it seems to
<conceivably>
properly deep copy an object in Ruby, I'm assuming that this simply is not the correct approach, and that there must be a better way. What other approach would be better? Requirements: I'd like to transform an arbitrarily deeply nested object, and also keep a copy of the original. Thanks :)
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<hackeron>
hey there, quick question about sementic logger - is there any easy way to have semanticlogger log when a process exits or otherwise dies with an exception? - I can't find anything built in, I take it I need to use at_exit or similar?
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<hackeron>
I guess this is an easy enough solution: at_exit { err = $!; logger.error(error) if err }
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<havenwood>
Ali_: I'd vote use an ordered list for your points so it's easier to discuss a number.
<havenwood>
Ali_: Since Rails prefers `rails db:...` to `rake db:...` I'd say use "rails".
<havenwood>
Ali_: I think the ideal command for a new setup is: rails db:setup
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<havenwood>
Which is the two steps you mentioned, plus a seed.
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<havenwood>
I definitely agree on not ignoring schema.rb and Gemfile.lock. (People ignore the Gemfile.lock in Rails apps?? Yikes!)
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<havenwood>
Ali_: I would add to seeds being idempotent and having necessary data changes that when there are data changes there should be an #up and #down and the #down should revert them.
<Guest12077>
I would never ignore Gemfile.lock, i've been involved with discussions around schema.rb
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<Ali_>
havenwood: also db:setup command uses db:schema:load
<havenwood>
Ali_: Aye, I like that.
<havenwood>
Faster.
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<Ali_>
havenmood: thanks +1
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<Ali_>
havenmood: I put them in numeric order
<terens>
How can I efficiently keep a map with blocks but expire them after some time ?
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<havenwood>
terens: I'm curious, can you say more about what you're wanting to do?
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<terens>
I want to do some kind of high level async request/response
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<terens>
send_msg(msg) { #cb }
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<johnjoseph___>
Hi! I have what seems to be a simple question but I can't find anyone discussing it, maybe I'm googling the wrong thing. From my understanding of RUBY_GC_HEAP_GROWTH_FACTOR, it will effect the behavior of ruby's initial acquisition of memory, and then once a process is started up and settled into its memory size, it doesn't effect behavior after that (because ruby doesn't give back OS memory). so, it seems that it
<johnjoseph___>
will esentially always make sense to set this quite low for web apps (or other servers/daemons), because the benefit of having the process take as little memory as possible far outweighs the cost of the process taking a few seconds longer to start. Does this sound right?
<baweaver>
terens: sounds like an XY problem
<baweaver>
?xy
<ruby[bot]>
it seems like you are asking for a specific solution to a problem, instead of asking about your problem. This often leads to bad solutions and increases frustration for you and those trying to help you. More: http://meta.stackexchange.com/a/66378
<mgraf>
"RUBY_GC_HEAP_GROWTH_FACTOR
<mgraf>
The factor by which the size of the heap grows when it needs to be expanded. Default value is 1.8. This has a direct influence on GC.stat[:heap_increment] since it is the relevant factor for heap resizing."
<johnjoseph___>
i'm not asking for a specific solution to a problem, and i have read the one-sentence description of the config variable, and i have looked at that blog post and it doesn't address my question.
<terens>
baweaver, What I want to do is socket communication between a rails app and ruby app. And I was examining whether it is possible to do a request response thing
<terens>
I use actioncable - websocket with rails already
<baweaver>
Probably, though I'd have to look into how on ActionCable
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<johnjoseph___>
(or maybe i'm incorrectly assuming your apps are on the same machine)
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<terens>
baweaver, yes but it doesnt have acks like socket io. However in socket io seems pretty simple
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<darkhanb>
I have an SSL error in my Ruby 2.1.3 installation on Debian 9: "OpenSSL::SSL::SSLError: SSL_connect returned=1 errno=0 state=error: certificate verify failed".
<darkhanb>
My ruby installation procedure was:
<darkhanb>
1) Manually compiled openssl-1.0.2n and installed to a special folder under /opt/...
<darkhanb>
2) Properly updated ldconfig for openssl-1.0.2n
<darkhanb>
Everything seems to be working, gem installations over HTTPS is working. However a simple open('https://www.google.com/') fails.
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<terens>
darkhanb, do you have correct system time
<terens>
?\
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<darkhanb>
terens yes, I have ntp installed and running
<terens>
seems it doesnt trust google cert
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<darkhanb>
terens I just have a feeling, that maybe since my openssl installation was not in the standard location, I have to let ruby know of the location of certificates
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<darkhanb>
but some certificates in /usr/local/lib/ruby/2.1.0/rubygems/ssl_certs
<darkhanb>
*but I see some certificates
<darkhanb>
maybe it's used just for gem
<terens>
maybe
<terens>
why not using a newer ruby ?
<mgraf>
darkhanb, could you just sym link to the normal install location?
<darkhanb>
terens current application requirement
<terens>
dunno I would try some net http directly and set cert store
<terens>
you can disable ssl verification but I do not recommend it
<darkhanb>
Ah
<darkhanb>
that was it
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<darkhanb>
I symlinked /opt/.deps_ruby-2.1.3/ssl/certs to /etc/ssl/certs, and it worked
<mgraf>
:)
<darkhanb>
thanks mgraf
<darkhanb>
thanks terens for your responses
<darkhanb>
good to have an IRC channel where people listen to your problems :)
<zleap>
darkhanb: yup, this is why i like IRC
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<mgraf>
Anyone here in Austin ?
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<mikkel->
What would you do: `(array1.count + array2.count) > 10` or `(array1 + array2).count > 10`
<mikkel->
And would there be a performance difference?
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<apeiros>
first one. also use .size, not .count
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<mgraf>
The second one is adding all of the items together to create a (potentially) massive array, and then counting the items
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<mgraf>
PEMDAS
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<apeiros>
is that a pajamas brand?
<mgraf>
It's something that you may have learned while wearing pajamas :)
<apeiros>
(despite its name, count without arg or block doesn't actually count the items)
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<Matt2843>
Hey Ruby rookie here o/ trying to print cli args if they belong to my array A.. so I defined A = [ 'a', 'b', 'c' ] and attempt: for i in ARGV puts i if i.in?A
<apeiros>
ARGV.each do |item| puts item if A.include?(item) end # raw translation of yours
<apeiros>
puts(ARGV & A) # the short version
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<Matt2843>
Okay thanks, what is the difference of ARGV.each do and for i in ARGV ? arent they both for-each like structures?
<apeiros>
for/in is a syntax construct and mostly for reasons of convention barely anybody uses it (internally uses .each anyway)
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<Matt2843>
Ah okay thanks for clarifying =)
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<apeiros>
i.in?(A) does not exist because it's not really reasonable for all objects to know how to check against all collection types whether they're part of it. i.e. any sane implementation would end up doing A.include?(i) internally anyway.
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<Matt2843>
I see, another issue I have, if I define a field in a file, say my array A, how do I access that field from inside a method? seems like im getting a runtime error when trying to access it currently
<Matt2843>
A = [] def something puts A end
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<apeiros>
that's a matter of how you make it available. `A` is a constant and globally visible. it should not be a problem to access `A` from everywhere (and through that, the object it references)
<Matt2843>
currently I have: A = [ 'a', 'b', 'c' ] and def method() puts(ARGV & A) end method(), and I get undefined local variable or method "A"
<apeiros>
`end method()`?
<Matt2843>
method() is on the next line to invoke the method
<apeiros>
ah. use ; to indicate newlines.
<Matt2843>
oh yes
<apeiros>
ruby treats them the same, so it even works.
<Matt2843>
oh is it normal to end lines in ruby with ;?
<Matt2843>
or statements rather
<apeiros>
hell no
<apeiros>
but it's useful for single-line mediums like irc
<Matt2843>
okay I get you yeah
<apeiros>
also in some rare cases to keep code more compact & readable
<Matt2843>
A = [ 'a', 'b', 'c' ]; def method() puts (ARGV & A) end; method()
<apeiros>
you should paste the real code
<apeiros>
because if you get "undefined local variable or method", then your variable is *definitively* not named "A"
<Matt2843>
making paste brb
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<Matt2843>
apeiros: http://ix.io/K8n (ignore the rest of the lines also just for testing)
<apeiros>
familiar_tags is a local variable. it does not share the scope of local variables within your method.
<apeiros>
FamiliarTags would be a constant. the first letter being uppercase making the difference.
<Matt2843>
wait
<Matt2843>
snake case makes a variable local?
<apeiros>
first letter decides
<apeiros>
iAmALocalToo
<Matt2843>
upper case = global, lower = local?
<apeiros>
but nobody (hopefully) uses camelCase for variables in ruby
<Matt2843>
and by tags II mean when I run a ruby program "ruby program.rb" react on the "-tags" provided to the program so "ruby program.rb -a -b -c"
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<apeiros>
there's optparse in the stdlib, and the slop gem which is quite often used and arguably more convenient.
<Matt2843>
thanks will check these =)
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<Matt2843>
wow slop seems nice
<apeiros>
btw., in case it didn't click: class names are constants.
<apeiros>
(well usually at least - nothing stops you from assigning a class to any other kind of variable)
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<cagomez>
what is this doing? `foo = Struct.new(:user) do; def do_this(&block); yield(user); end; end;`
<Matt2843>
apeiros: I used Slop and it works like a charm, however when I pass a param as a string I currently have to surround the param with "" or '' any way around this say if I want to call ruby program.rb -o Hello World -b Goodbye World instead of program.rb -o "Hello World" -b "Goodbye World"
<cagomez>
Is it defining a method on the struct called `do_this` that accepts a block, then passes the `user` to the block?
<apeiros>
cagomez: correct
<apeiros>
cagomez: and it should drop the (&block) part
<apeiros>
(it doesn't change how the method works, but it makes it slower by forcing ruby to turn the passed block into a Proc instance - without actually using it)
<cagomez>
why apeiros? is this incorrect if I pass in blocks like so: `foo.do_this(user).do_this(user)`
<cagomez>
when doing the above, I get `ArgumentError: wrong number of arguments (given 1, expected 0)`
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<apeiros>
Matt2843: that'd be non-standard. it might still be possible to do it with slop, I don't know. but it'd work differently than about every other cli app.
<apeiros>
cagomez: foo is the struct class. at least in the code you showed. so first thing you'd have to do is call new. foo_instance = foo.new
<Matt2843>
apeiros: okay i'll stick to the standard then thanks
<apeiros>
and then on foo_instance you can invoke do_this. but do_this(value) does *not* pass a block to do_this, it passes a normal argument.
<cagomez>
ah right, I didn't include the `new`. But I do get that error. How do I pass a block?
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<apeiros>
by using block syntax. either `do_thing do … end` or `do_thing { … }`
<apeiros>
where … is your code
<cagomez>
ah, how about this: `Foo.new(user).do_this(say_hi).do_this(say_bye)`
<cagomez>
where say_hi, say_bye are methods?
<apeiros>
again, you are not passing any block.
<apeiros>
{} or do/end. those are blocks.
<apeiros>
and since the do_this you've shown does not return self, you can't chain another do_this on the result either.
<apeiros>
huh? baweaver, didn't you relink that to your site?
<baweaver>
Nope
<baweaver>
Just in the topic
<machinewar>
apeiros: then on the proxy would you use something like method_missing?
<apeiros>
not something like. you'd use exactly method_missing ;-)
<machinewar>
apeiros: lol kk thank you
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<apeiros>
BasicObject is your friend for building proxies. just remember that you can't use anything directly in there. e.g. even puts will be ::Kernel.puts in there (or $stdout.puts)
<apeiros>
or I guess what I needed more often: raise is ::Kernel.raise, p is ::Kernel.p (not even just `Kernel`, constant lookup won't work like that either)
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<machinewar>
very interesting
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<Matt2843>
anyone used Slop before? i've created my opts = Slop.parse do |o|, but where do I rescue the errors?
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<Matt2843>
nevermind figured it
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<Matt2843>
apeiros: http://ix.io/KaZ when I define my opts like so using Slop I can no longer access the params via the last line in the paste, any idea why? (this raises an error)
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<Matt2843>
im really stuck with this slop issue
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<cagomez>
`foo = Struct.new(:user) do; def do_this(&block); yield(user); end; end`. How do I set the value of the struct's `user` attribute inside of `do_this`?
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<havenwood>
Matt2843: there aren't prototypes, per se
<cagomez>
what if my block returns another block? How do I call that?
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<Matt2843>
havenwood: hmm so the order of my methods matter? I cannot call a method that I define later?
<havenwood>
cagomez: Say more?
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<havenwood>
Matt2843: Non-duplicate method order doesn't matter within a class or module.
<havenwood>
Matt2843: I'd suggest trying out the code you're wondering about in IRB or Pry.
<havenwood>
?irb
<ruby[bot]>
irb is "interactive ruby", it is part of ruby. You can run ruby code and see results immediately. it's useful for testing code. Also see ?pry, a gem which is a popular alternative to irb.
<havenwood>
?pry
<ruby[bot]>
Pry, the better IRB, provides easy object inspection `ls`, `history`, viewing docs `?`, viewing source `$`, syntax highlighting and other features (see `help` for more). Put `binding.pry` in your source code for easy debugging. Install Pry (https://pryrepl.org/): gem install pry pry-doc
<cagomez>
for example, `def do_this; Proc.new { |x| x }; end;` and `foo = Struct.new(:user) do; def do_that(&block); # call do_this with User here #; end; end` . if
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<cagomez>
I'd like to do `foo.do_that { do_ this }`
<havenwood>
cagomez: foo.do_that &do_this
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