#ruby-lang on 2014-12-01 — irc logs at freenode.irclog.whitequark.org

2014-11-13 14:57 apeiros changed the topic of #ruby-lang to: Ruby 2.1.5; 2.0.0-p598; 1.9.3-p551: http://ruby-lang.org || Paste code on http://gist.github.com

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01:28 <abder> Hi, What is the purpose of "attr" in Ruby?

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01:32 <apeiros> abder: make your life easier

01:33 <abder> Can you kindly clarify? I'm really new to Ruby

01:33 <apeiros> it writes methods for you

01:34 <apeiros> e.g. `attr_reader :foo` does the same as if you'd write `def foo; return @foo; end`

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01:34 <apeiros> the docs can tell you that just as well. you know how to use ri? or ruby-doc.org etc?

01:34 <abder> Regarding the docs, not yet a professional on that

01:35 <apeiros> o0

01:35 <abder> I'm aware of attr_reader, attr_writer, attr_accessor, but was confused about "attr" alone

01:36 <abder> The issue is what does using "attr" alone mean?

01:36 <apeiros> iirc it's the same as attr_reader. not sure. *checking*

01:37 <weaksauce> abder it stands for attribute... you can put them on classes to expose readers and writers of a variable

01:37 <weaksauce> abder without writing the boilerplate code like in java

01:37 <apeiros> ah, right

01:37 <apeiros> attr :foo # same as attr_reader

01:38 <apeiros> attr :foo, false # same as attr_reader

01:38 <apeiros> attr :foo, true # same as attr_accessor

01:38 <apeiros> and reading the source it's deprecated.

01:38 <apeiros> use att_reader/_writer/_accessor instead

01:39 <abder> h, got what you mean. Very nice. Appreciate it!

01:39 <abder> And, just a quick question

01:39 <abder> I came across this line:

01:39 <abder> conditions ||= lambda {true}

01:39 <abder> I really didn't understand ||=

01:39 <abder> do you know what it mean?

01:39 <womble> It means "only set conditions if conditions isn't already set"

01:40 <ericwood> abder: it means assign whatever is on the right if the value of the left is falsy

01:40 <womble> It's equivalent to conditions = conditions || lambda {true}

01:40 <abder> great! thanks a lot for your kind support

01:41 <womble> No problems. The invoice is in the mail.

01:41 <godd2> also, if its false, it will get set to the new value

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01:41 <jhass> womble: abder nitpick but a ||= b actually equivalent to a || a = b

01:41 <jhass> which in rare cases matters

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01:43 <abder> jhass can you kindly clarify what a || a = b means?

01:43 <abder> an example maybe?

01:43 <ericwood> a = b won't be executed if a is "falsy"

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01:43 <jhass> yes, || && "short-circuit"

01:43 <ericwood> just because of the nature of conditionals; if it fails immediately the rest of the conditional isn't even evaluated

01:44 <jhass> their right hand side won't be run if the left hand side determines the output of the expression already

01:44 <ericwood> if you use ||= in the context of other code (don't do this!) operator precedence can get wonky

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01:44 <jhass> the difference is important because you can do a.b ||= c which calls the b= method on a

01:45 <jhass> if a.b ||= c expanded to a.b = a.b || c there would always be that method call

01:45 <jhass> which could have unwanted side effects

01:45 <ericwood> so general guidelines for ||= 1) use it on its own 2) only use it for values where falsy values aren't desired

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01:50 <ericwood> one of these days I'll come up with a decent explanation of &:

01:51 <jhass> start by stopping to see '&:' as operator

01:51 <jhass> the operator is &, the : is part of it's operand already

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01:51 <jhass> &(:foo)

01:52 <ericwood> that's a good way to phrase it

01:52 <ericwood> the & is syntactic sugar, correct?

01:52 <jhass> not really, it's an operator

01:52 <ericwood> it only has that significance in function calls/declarations

01:52 <godd2> yea it runs to_proc on the symbol

01:52 <ericwood> right

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01:52 <jhass> syntax sugar means there's another way to write it

01:52 <jhass> there's none for &

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01:53 <jhass> a.b = c is syntax sugar

01:53 <jhass> a.b=(c) is the canonical way to write that expression

01:53 <drewxiu> hey

01:53 <jhass> array.[](0) same

01:53 <ericwood> jhass: fair enough, that's the wrong term

01:53 <godd2> a[3] = 2 is syntactic sugar for a.[]=(3,2)

01:53 <jhass> or hash.[]=(k, v)

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01:53 <jhass> ah, too slow

01:53 <jhass> ;P

01:54 <godd2> :D

01:54 <ericwood> :D

01:54 <apeiros> calling to_proc is more of a side-effect really

01:54 <ericwood> I was explaining operators as functions to a student recently, it was great :D

01:54 <apeiros> as it needs a Proc to work, to_proc is the tool it uses to normalize values "passed" to it

01:54 <abder> wombie invoice in the mail?

01:55 <ericwood> drewxiu: hi!

01:57 <abder> What is "lambda"?

01:57 <ericwood> abder: you can think of it as a function of sorts

01:57 <apeiros> something much less fun than its cousin, lambada

01:58 <godd2> abder think of it as a method you can pass around and execute later

01:58 <ericwood> abder: it's a function without a name

01:58 <drewxiu> ruby supports lambda expressions?

01:58 <ericwood> this is an article that might help you: http://rubymonk.com/learning/books/1-ruby-primer/chapters/34-lambdas-and-blocks-in-ruby/lessons/77-lambdas-in-ruby

01:58 <drewxiu> oh sweet

01:58 <ericwood> drewxiu: Ruby is all about closures and like FP stuff and whatever

01:59 <abder> ericwood: i was just going through the tutorial you sent me. i saw "anonymus" but didn't get it

01:59 <ericwood> abder: that basically means it doesn't have a name

01:59 <drewxiu> nice.. (math minor) lol. i've been messing with ruby on rails recently.. good to know

01:59 <abder> so, is it just some anonymous function to work with

01:59 <ericwood> yah!

02:00 <abder> when should we use such function? does it have a purpose?

02:00 <jhass> many!

02:00 <ericwood> sometimes you want to pass chunks of code around as data!

02:00 <jhass> do you understand blocks yet?

02:00 <abder> yes, i understand blocks

02:00 <ericwood> drewxiu: this is a good article on stuff: http://www.reactive.io/tips/2008/12/21/understanding-ruby-blocks-procs-and-lambdas/

02:02 <drewxiu> ericwood: thanks! I really hadn't explored the language as opposed to messing around with rails.

02:02 <jhass> abder: what would you do if you want to pass two blocks to a method?

02:03 <godd2> abder for example, rails stores named scopes in lambdas so that they can be run later for sql queries dynamically.

02:03 <jhass> abder: you would use a block and a lambda/proc or two lambdas/procs

02:03 <jhass> you can think of a lambda/proc as a block assigned to a variable that you can pass around

02:03 <jhass> in fact you can "capture" a block as such

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02:15 <drewxiu> jhass: that seems very 'functor' like

02:16 <jhass> well, ruby still is first class OOP, so not too many of the functional concepts, or at least terms apply well IMO

02:17 <jhass> but then I haven't seriously worked with a functional language yet, so I might be misjudging

02:17 <godd2> Lots of Ruby folk are learning Clojrue for their funcitonal language.

02:17 <godd2> You might like it jhass :)

02:17 <ericwood> seen a lot of people getting into Elixir as well

02:19 <drewxiu> Elixer?

02:19 <drewxiu> is that functional ?

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02:19 <ericwood> it's a functional language that runs on the Erlang VM

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02:20 <ericwood> pretty cool stuff, hides a lot of the ugliness of Erlang (yes, I know it's subjective)

02:21 <hendranata_> tes

02:23 <drewxiu> yeah now that sounds pretty cool

02:24 * jhass hands hendranata_ a t

02:25 <drewxiu> do any of you guys use ruby in industry? Do you commonly interface with other langs? or is rails normally the end all be all ?

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02:27 <ericwood> there's plenty of Ruby use outside of rails

02:27 <ericwood> I personally work at a rails shop of sorts, but we have all kinds of non-rails services written in Ruby

02:28 <ericwood> a big example (here in AUSTIN) is Rapid7 and their exploitation tool Metasploit

02:28 <ericwood> it's all ruby, with tie-ins to other languages, etc.

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02:30 <ericwood> there's tools like Puppet, etc. written in Ruby as well

02:30 <ericwood> (puppet is very very commonly used in the ops world)

02:31 <red_menace> I think you scared him off

02:31 <ericwood> :'(

02:31 <ericwood> I hide joins/parts in this channel

02:32 <red_menace> it does add a lot of noise

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02:32 <jhass> smart filter ftw!

02:34 <ericwood> btw if any of you live in austin come to this tomorrow: http://www.meetup.com/austinrb/events/218735924/

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10:05 <yorickpeterse> morning

10:07 <ndrst> morning!

10:08 <Eising> morning :)

10:09 <hanmac1> nobu that meanie did break my binding again :/

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10:13 <andy888> test

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10:52 <darix> hanmac1: broke how?

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10:53 <hanmac1> darix: https://github.com/ruby/ruby/commit/544d28c300b5a8084693968cb88b75443def8ab2 he disable rthat rb_data_type_t can have parents ... that does crash with my binding because i need that feature

10:54 <darix> hanmac1: i think that question might be more successful on the ruby ML :)

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11:02 <hanmac1> hm i send him a pm via https://www.ruby-forum.com/user/show/nobu

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11:24 <maloik> yorickpeterse: you were changing to dotenv right... do you use that in production too?

11:25 <yorickpeterse> maloik: yes

11:25 <yorickpeterse> I know that makes me a sinner but w/e it's easy

11:25 <yorickpeterse> basically we take EC2 userdata, yank the env variables out of it and save it in ".env.userdata"

11:25 <yorickpeterse> which is then loaded by the app

11:25 <maloik> I'm considering doing the same if the team agrees... just ran into a little issue where a new key wasn't found in my own secrets.yml so my tests didn't run

11:25 <maloik> took a little while to figure that out

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11:25 <maloik> so I'll either end up writing a gem that stops the test run and/or deploys when that happens, or move to dotenv

11:26 <yorickpeterse> the load process we have is basically: ".env.userdata" -> ".env.$ENV" -> ".env"

11:26 <yorickpeterse> (priority in that order)

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15:04 <svajone> Hello. Quick question, what's the best way to select items on an array?

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15:05 <darix> svajone: it depends

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15:06 <svajone> Say, I have an AR called orders that belongs to a table called users. I want to go through the orders whilst selecting only users that are active.

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15:06 <apeiros> svajone: Array#select?

15:06 <svajone> I did something like this, orders.each { |order| order.user.status == active } but it seems to give me inconsistent results, sometimes it would return 2 or 3 or even 1 (I only have 5 sets of data, 3 are active, 2 are not).

15:07 <svajone> Sorry, I mean orders.select

15:07 <apeiros> svajone: AR? as in ActiveRecord model? let the db do the selection.

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15:07 <apeiros> use .where

15:08 <apeiros> also AR models and relations are NOT arrays.

15:08 <svajone> I see.

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15:08 <svajone> I thought they were?

15:08 <apeiros> no. what gave you that idea?

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15:09 <svajone> Someone who is more senior in Ruby in my work told me.

15:09 <svajone> Says, it's an AR but has more methods or something.

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15:09 <apeiros> then either he poorly explained or should educate up

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15:10 <svajone> Maybe or maybe I misunderstood.

15:10 <apeiros> s/he/they/ … I'll never learn. sob.

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15:13 <svajone> I'll give it a whirl.

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15:14 <kappaloris> hello, can please anyone tell me wether Net::SSH is threadsafe or not?

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15:15 <apeiros> kappaloris: nothing which does not explicitly state to be thread safe is thread safe.

15:15 <ljarvis> wat

15:15 <ljarvis> ah nothing

15:15 <ljarvis> that sentence reads so weird

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15:16 <apeiros> since I say it somewhat often - better phrasings?

15:16 <matti> Yo apeiros

15:17 <apeiros> hi matti

15:17 <matti> apeiros: You need a tatoo - "No, it's not thread-safe".

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15:17 <ljarvis> i'd just negate it, anything which does not explicitly state to be thread safe is not thread safe, but yeah it was really just me missing the "nothing" it's still a double negative

15:18 <yorickpeterse> get a tramp stamp with "tharedngi" as the text

15:18 <ljarvis> "always semaphoring"

15:19 <yorickpeterse> haha

15:19 <yorickpeterse> or do something like

15:19 <yorickpeterse> mutex.synchronize { <butt here> }

15:19 <yorickpeterse> Though I wonder where you'd put the } then

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15:19 <darix> svajone: ugh ... dont load all users into the memory of your app just to filter them there. -.-

15:19 <matti> ljarvis: http://www.quickmeme.com/img/95/95345c5a7574313b988224d6e7796ed283ee6d57780b9fa853c402d9df6a4e45.jpg

15:20 <ljarvis> matti: :D

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15:20 <darix> svajone: for things like that you could even provide a scope like scope :active, -> { where(active: true) }

15:20 <matti> yorickpeterse: Yo :)

15:21 <yorickpeterse> hai

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15:21 <matti> ljarvis: Rub some Golang on it.

15:21 <yorickpeterse> channels bra

15:21 <ljarvis> matti: but it's covered in golang already

15:21 <ljarvis> and erlang

15:21 <yorickpeterse> with some sick goroutines

15:21 <matti> ljarvis: They I will be able to send you meme "No, it does not have Generics yet"

15:21 <ljarvis> derp

15:21 <matti> Haha

15:22 <matti> Erlang :)

15:22 <darix> svajone: with the scope you can do "Users.active..."

15:22 <yorickpeterse> I'd totally use Erlang, if I had a use case for it :|

15:22 <svajone> And just merge it?

15:22 <darix> i am missing some clojure in the discussion

15:22 <ljarvis> we dont need webscale yet

15:22 <svajone> Sorry, been awhile since I did IRC how do I mention someone again?

15:22 <svajone> --help

15:22 <svajone> ?

15:22 <svajone> -help

15:22 <matti> svajone: /help

15:23 <ljarvis> svajone: /help and you just prefix your message with their name

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15:23 <svajone> ljarvis, thanks!

15:23 <svajone> ljarvis: thanks

15:23 <matti> yorickpeterse: If you can't find a use-case for Elrnag, you are doing it wrong ;p

15:23 <ljarvis> learn to erlang?

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15:23 <yorickpeterse> you gotta feel your inner Erlang

15:23 <yorickpeterse> then Erlang will come to you

15:23 <matti> Yeah.

15:24 <ljarvis> unless you're using node, then you're always doing it right

15:24 <matti> Erlang, you must code.

15:24 <yorickpeterse> Well yeah, even IBM is using Node now

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15:24 <ljarvis> callbacks are the threads of 2015

15:24 <darix> yorickpeterse: microsoft too.;)

15:24 <matti> yorickpeterse: Oh no :(

15:24 <ljarvis> that doesn't make any sense but I'm sticking with it

15:24 <yorickpeterse> https://www.ibm.com/developerworks/community/blogs/mobileblog/entry/ultimate-javascript-environment?lang=en

15:24 <darix> yorickpeterse: but tbh ... IBM isnt really doing nodejs until they ported it to s390 ;)

15:24 <yorickpeterse> Alternative title: "How we wasted thousands of dollars by using a single-core language"

15:25 <apeiros> callbacks are great. but you can create horrible spaghetti with it.

15:25 <ljarvis> i really dislike callbacks

15:25 <darix> microsoft is using nodejs for the azure cloud cmdline tools

15:26 <ljarvis> cli-scale?

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15:27 <yorickpeterse> lol wtf

15:27 <yorickpeterse> Even using plain Bash makes more sense there

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15:27 * yorickpeterse wrote half a build server in Bash

15:27 * yorickpeterse fears the day he doesn't remember what it does

15:28 <yorickpeterse> Granted the rest is Jenkins/Java, can't get any worse any way

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15:28 <darix> yorickpeterse: imho ... bash sucks for everything beyond calling a few other tools. as soon as you start using array hashes or doing some more string mangling most of the other languages would be better.

15:28 <ljarvis> lies

15:28 <ljarvis> php

15:28 <yorickpeterse> darix: that's basically what it does, hence I used Bash

15:28 <darix> speaking about php http://www.wilfred.me.uk/blog/2014/10/20/the-fastest-bigint-in-the-west/

15:28 <yorickpeterse> just runs a bunch of rm/tar commands, etc

15:29 <ljarvis> darix: but it's metal, just use filename->contents as a hash

15:29 <ljarvis> and a directory to store them all

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15:29 <darix> or that http://jasonframe.co.uk/logfile/2009/01/php-5-3-exception-gotcha/

15:29 <darix> ljarvis: ugh

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15:29 <yorickpeterse> yay Rubinius can do bigints really fast

15:30 <yorickpeterse> that's totally gonna help those thousands of Rails apps :P

15:30 <yorickpeterse> Funny enough I think we were actually discussing something about using GMP or w/e it was

15:31 <yorickpeterse> https://github.com/rubinius/rubinius/issues/2981 ah yes

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15:32 <darix> that static linking argument again ...

15:32 <darix> we should really rip static linking out of our linker and compilers

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15:32 <headius> we should really rip GPL out of our systems, if you ask me

15:33 <darix> headius: i dont think your employer would agree ;)

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15:33 <yorickpeterse> I agree on the GPL part

15:33 <headius> we use many licenses

15:33 <darix> headius: also LGPL is only an issue if you do link statically.

15:33 <darix> for dynamic linking it is fine.

15:33 <headius> has that been proven in court?

15:33 <headius> and what comprises dynamic linking? All classes are dynamically linked on JVM, for example

15:34 <darix> headius: i dont think anyone sued over that part yet. i think most cases in court were about plain GPL

15:34 <headius> we had to rip out all GPL or LGPL-only libraries in JRuby because many companies won't touch them

15:34 <workmad3> also, both GPL and LGPL do nothing if you aren't distributing the built binaries anyway... e.g. if you're using GPL code in some components that are never distributed, only exist on your server, you have no requirement to release any code

15:35 <darix> that too

15:35 <darix> but there is AGPL for that ;)

15:35 <darix> just saying

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15:35 <headius> Apache-2.0 ftw

15:36 <headius> or similar licenses like EPL

15:36 <yorickpeterse> workmad3: thing is, we do distribute binaries

15:36 <yorickpeterse> Not statically linked though

15:37 <yorickpeterse> well except for the stuff we vendor (e.g. libffi)

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15:56 <djwilcox> i installed ruby with rvm, but im having some issues with my bash $PATH

15:56 <djwilcox> ruby is installed here - /usr/local/rvm/gems/ruby-1.9.3-p551/bin

15:56 <djwilcox> anyone know correct way to add this to my bash path

15:57 <ericwood> djwilcox: export PATH=$PATH:/usr/local/rvm

15:57 <djwilcox> thanks ericwood, cheers mate

15:57 <ericwood> typically you have something in your bash_profile that sets up any custom path stuffs

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15:57 <ericwood> there's also information on this in the RVM docs as part of the setup

15:58 <djwilcox> im setting up ruby in docker, and was having some issues

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16:17 <chris2> i found the first use for unicode identifiers!

16:18 <chris2> naming variables f′ as in haskell

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16:21 <darix> o.O

16:21 <darix> chris2: stop being weird!

16:21 <chris2> are you denying my existence?

16:23 <darix> https://rubygems.org/gems/symbols

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16:23 <darix> there was also a gem that provided default aliases for things like lambda

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17:53 <S3thc0n> Hello, I am trying to use Ruby for an API which isn't easily accessible in other ways, but I whenever I try executing a script I get a 'cannot load such file' error with seemingly EVERY 'require'. My version is 1.9.3 on Windows. What am I doing wrong?

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17:56 <centrx> S3thc0n, Hard to say. First impression is Windows does not work very well with Ruby and Ruby 1.9.3 is really quite old

17:57 <S3thc0n> centrx: Thanks, I'll try with a Vm

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18:23 <kiraz_> I am new to IRC and trying to understand the dynamic

18:23 <kiraz_> whats happening here?

18:23 <kiraz_> can someone explain:)?

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18:23 <red_menace> not much - what are you looking for?

18:24 <kiraz_> trying to udnerstand the dynamic in comparaison to reddit or stack overflow

18:25 <red_menace> depends on who is actually online, but reddit or SO are not real-time

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18:26 <centrx> also reddit sucks

18:26 <kiraz_> why?

18:26 <centrx> they used to be cool

18:26 <kiraz_> what is it in the real time that you like?

18:26 <havenwood> kiraz_: there are snakes in the tubes delivering messages

18:27 <kiraz_> snakes??

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18:27 <red_menace> SO can be a bit rough also, especially if you are a noob

18:27 <havenwood> kiraz_: yeah, that's how irc works

18:27 <centrx> yes IRC is very dangerous

18:27 <centrx> snakes, trolls,...

18:27 <red_menace> FBI...

18:27 <kiraz_> i see

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18:27 <kiraz_> so why are you using it??

18:28 <centrx> hookers and coke

18:28 <red_menace> it depends on what you are looking for - this conversation, for example, would not happen on reddit or SO

18:28 <havenwood> kiraz_: a higher percent of irc traffic is over tor

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18:29 <centrx> kiraz_, There's no better way than IRC to actually talk to a group of people

18:29 <centrx> kiraz_, Skype, Twitter, etc. are just knock-offs of IRC

18:29 <red_menace> yeah IRC is way old

18:29 <havenwood> kiraz_: but irc is more conversational. responses can be quicker, depends on the channel. it's not unusual for it to take minutes or hours to get a response, depends.

18:30 <havenwood> kiraz_: a chat

18:30 <havenwood> kiraz_: not a bulletin board or forum

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18:30 <red_menace> the conversations are a lot more dynamic

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18:31 <havenwood> flurries of activity, then silence.

18:31 <kiraz_> what about the anonymity? do you like this?

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18:31 <kiraz_> would you use if it was not anonynous?

18:32 <centrx> It's not anonymous, Mr http://webchat.freenode.net

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18:40 <kiraz_> what are people looking for here? they ask programing question?? share ressources? look to collaborate on projects?

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18:41 <jhass> all of that and more

18:41 <kiraz_> but how do you keep track of things - and especially people

18:41 <red_menace> this particular channel is mainly about the Ruby language itself - there are hundreds of others

18:42 <jhass> note that there are channels that have topics, you're in #ruby-lang so we tend to talk about Ruby

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18:42 <weaksauce> kiraz_ you don't really keep track but if you frequent some channels a few people keep popping up and you get to know them

18:44 <kiraz_> are you guys active on other plateform such as reddit or SO?

18:46 <red_menace> I quit SO a while back - they are a bit too cliquey

18:46 <kiraz_> cliquey?

18:46 <kiraz_> why is that?

18:47 <red_menace> yeah, once people get over a certain amount of points, or whatever, they seem to turn into asshats

18:48 <red_menace> half the comments on that site are about whether or not the current question is on topic or not

18:48 <centrx> asshat is one of the badges

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18:49 <red_menace> I must have missed it - might have stayed for that one

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18:49 <kiraz_> lol, yea you are right SO people can be bitchy

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18:51 <red_menace> after you've been there a while, it just isn't any fun - IRC isn't that much more fun, but it does get funny sometimes

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18:51 <micechal> can someone tell me if the statement in this: http://hastebin.com/oliwexodij.coffee

18:51 <micechal> is true?

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18:51 <micechal> of course these functions are inexistent

18:52 <micechal> but does it work this way in theory?

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18:53 <jhass> micechal: you can look at its implementation, it's just one line: [random_bytes(n)].pack("m*").delete("\n")

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18:53 <jhass> http://ruby-doc.org/stdlib-2.1.4/libdoc/securerandom/rdoc/SecureRandom.html#method-c-base64 -> toggle source

18:54 <micechal> I googled this page already but it didn't say too much to me

18:55 <ledestin> crud. Semaphore-CI runs specs faster than my own server.

18:55 <micechal> I really don't know much about Ruby, it's just that I've got some Ruby code and I want to translate it to different language

18:55 <micechal> so I am trying to understand it first

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19:00 <jhass> did you look at Array#pack then yet?

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19:01 <micechal> not yet, should I?

19:02 <jhass> well, it's an essential part of what happens as you can see in the implementation

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19:28 <jkad1> can anyone verify if the rvm website is down?

19:29 <yorickpeterse> jkad1: works fine here

19:29 <red_menace> same here

19:29 <jkad1> thanks, dunno why i cant connect

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19:39 <wink_ndge> Seen a few services blaming a DNS outage. Could be related

19:40 <wink_ndge> Atom.io and Codeschool down

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19:49 <jkad1> wink_ndge: yeah i cant connect to them rvm is back up now though

19:49 <jkad1> for me anyway

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19:56 <ericwood> anything that uses DNSimple is down right now

19:56 <ericwood> it includes a lot of hip tech sites lol

19:57 <apeiros> hack or failure?

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20:00 <ericwood> failure hack

20:00 <ericwood> idk keep checking hacker news

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20:05 <wink_ndge> http://dnsimplestatus.com/

20:05 <voxxit> they should use cloudflare :P

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20:06 <ericwood> DDoS, nice

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20:24 <darix> brixen: RSTRUCT_PTR - should that be provided in rubinius header files?

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20:24 <yorickpeterse> darix: it appears to be related to MRI's rgenc, which we don't have. What do you need it for?

20:25 <darix> https://github.com/apalmblad/ruby-shadow/issues/21#issuecomment-65122863

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20:26 <yorickpeterse> darix: https://github.com/rubinius/rubinius/issues/494

20:26 <yorickpeterse> Probably still the case

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21:00 <wink_ndge> DNSimple is Saint Louis, US right? http://map.ipviking.com/

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21:05 <yorickpeterse> Darn parser tables

21:05 <yorickpeterse> (╯°□°)╯︵ ┻━┻

21:06 <yorickpeterse> At the end of the tunnel I can see how these bastards work, but holy crap it's explained in stupid ways

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22:00 <womble`> alec1: Not based on that description.

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22:37 <svajone> Looking for the person who told me earlier than ActiveRecords are not arrays.

22:38 <svajone> When using ruby's << method to push records into an ActiveRecord, what are the consequences?

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22:41 <workmad3> svajone: a) #rubyonrails is a better channel for activerecord questions

22:41 <toertore> if by "an ActiveRecord" you mean an instance of ActiveRecord::Base, i'm pretty sure the consequence is a NoMethodError

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22:42 <workmad3> svajone: b) << works on has_many associations within activerecord, not just any activerecord derived class

22:42 <svajone> workmad3, thanks!

22:43 <workmad3> svajone: c) the behaviour of << can be affected by configuration values away from where you're using it, so it can be non-obvious exactly what will happen when you use it

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22:44 <svajone> Oh, well the situation is this, first, I query a model using a set of scope, then after that query another model using a certain type of filters (scopes are not permissible at this point, let's assume that). And I want t push the second queried model to the first one using the << method, I just want to know what would the effects be.

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22:45 <workmad3> svajone: I'd suggest asking the question in #rubyonrails where they (and maybe me) will probably ask you for actual code because talking in generalities can be pretty confusing

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23:31 <RickHull> Hello, I'm trying to work on performance optimization for a gem of mine: https://github.com/rickhull/conway_deathmatch

23:31 <RickHull> the last time i looked at perf and profiling in ruby was like 5 years ago, 1.8.x days

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23:31 <RickHull> things have changed, I'm sure. I'm starting with ruby-prof now

23:32 <RickHull> here is the default output for ruby-prof, above 0.5% self time: https://github.com/rickhull/conway_deathmatch

23:32 <RickHull> oops, https://gist.github.com/rickhull/3925531c1e6ee2860ea6

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23:33 <RickHull> immediately, I'm wondering about my choice to use a range for bounds enforcement

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23:33 <apeiros> int.between?(lower, upper)

23:33 <RickHull> perhaps I'm just doing "too much" bounds enforcement / checking?

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23:34 <RickHull> apeiros: ah. any reason to think it's faster than range.include?(int)

23:35 <havenn> >> [(1..10).cover?(5), 5.between?(1, 10)]

23:35 <eval-in__> havenn => [true, true] (https://eval.in/229153)

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23:40 <havenn> RickHull: it can make a huge difference

23:40 <RickHull> i believe it. eval is just showing equivalent output, but not perf, right?

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23:42 <whitequark> yes

23:42 <apeiros> RickHull: less object allocations

23:42 <havenn> RickHull: compare `("a1".."a1000000").include?("a1000000")` with `("a1".."a1000000").cover?("a1000000")`

23:42 <apeiros> also the method afaik is a bit simpler

23:43 <apeiros> but no idea what the diff is

23:43 <RickHull> cool, thanks for info all, playing around

23:43 <havenn> if they're simple numerics, #include? checks magnitude

23:43 <apeiros> Range#include? with numeric arguments is btw. special cased to be identical to cover?

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23:56 <RickHull> inneresting, Range#cover? provides no (apparent) benefit over #include? for integers https://gist.github.com/rickhull/3925531c1e6ee2860ea6

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