#ruby-lang on 2013-10-19 — irc logs at freenode.irclog.whitequark.org

2013-09-29 20:40 apeiros changed the topic of #ruby-lang to: Nick registration required to talk || Ruby 2.0.0-p247: http://ruby-lang.org (Ruby 1.9.3-p448) || Paste >3 lines of text on http://gist.github.com

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00:15 <julian__1> Best way to keep a Curses window open?

00:15 <julian__1> without a getch?

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00:15 <julian__1> some sort of infinite loop?

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00:16 <drbrain> julian__1: don't call #close on it

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00:17 <julian__1> drbrain: say I have win1

00:17 <julian__1> it disappears unless I write win1.getch

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00:17 <julian__1> it's waiting for user input before it closes

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00:18 <julian__1> but windows seem to close automatically ?

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00:20 <julian__1> drbrain: When I say the window disappears

00:20 <julian__1> it never shows up

00:20 <julian__1> but I assume it sort of exists, but disappears 'too quickly' to be seen

00:20 <drbrain> julian__1: did you refresh it?

00:20 <julian__1> unless I use win1.getch

00:20 <julian__1> ah

00:20 <julian__1> no

00:20 <drbrain> refresh says "I made changes to this window, please redraw it"

00:20 <julian__1> :P

00:21 <julian__1> thanks for the english :)

00:21 <julian__1> the docs don't really explain what's going on

00:21 <julian__1> well, they do a little

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01:06 <julian__1> drbrain: How would you propose creating windows dynamically?

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01:06 <julian__1> http://pastebin.com/PKp5j7Yu

01:07 <julian__1> This says that create_window is a private method

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01:07 <julian__1> I assume this is because foo isn't an object..maybe it's because I haven't created foo?

01:08 <julian__1> haven't created it as an object, or something?

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01:11 <hfp> Hi guys, just wondering if var = gets.chomp.lowercase is the same as var = gets.chomp.lowercase!

01:11 <julian__1> drbrain: http://stackoverflow.com/questions/6741567/ruby-metaprogramming-dynamic-instance-variable-names

01:11 <julian__1> Maybe I should create a public method?

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01:12 <julian__1> and create the object (win1 whatever) from a string within the public method using the instance_variable_set method

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01:17 <julian__1> hfp: No, they're not the same.

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01:18 <hfp> julian__1: That's what I can't wrap my head around.

01:18 <julian__1> hfp: If a method as an '!' after it means it's a bang method, meaning it actually changes the variable it's called on

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01:18 <julian__1> hfp: I'll create a pastebin to show you

01:18 <hfp> so var = "STRING".downcase will not change var's contents to "string"?

01:18 <hfp> Ok thanks julian__1

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01:21 <julian__1> http://pastebin.com/CMVxbkEM

01:21 <julian__1> hfp: Does that help? :)

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01:22 <julian__1> hfp: A bang method actually goes and re-writes the variable it's called on

01:23 <julian__1> hfp: A 'normal' method returns what it's done, but doesn't actually change the variable at all

01:23 <hfp> julian__1: Yes, thanks although it's counter intuitive. If you assign the variable explicitly why require a '!' ? Isn't it redundant?

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01:24 <charliesome> hfp: ! doesn't rewrite the variable

01:25 <charliesome> most ! methods will mutate the actual object they're called on

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01:25 <charliesome> which is subtly different

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01:26 <hfp> I see. So var1 = "DOG".lowercase will still leave var1's contents as "DOG"?

01:26 <julian__1> hfp: Yes, exactly

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01:26 <julian__1> no

01:26 <julian__1> well yes, but you're syntax is a little weird

01:26 <julian__1> var1 = "Dog" var1.lowercase

01:27 <julian__1> that will leave var1's contents as "Dog"

01:27 <hfp> So calling these methods when assigning variables without the '!' is utterly useless then.

01:27 <heftig> hfp: var1.lowercase! will mutate var1's string, making it lowercase

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01:28 <heftig> hfp: var1 = var1.lowercase will make a copy of var1, lowercase it, then assign it to var1

01:28 <heftig> the difference is significant when you have other references to the string

01:28 <heftig> watch:

01:28 <julian__1> heftig: I think he understands

01:28 <heftig> >> var1 = "DOG"; var2 = var1; var1.lowercase!; [var1, var2]

01:28 <eval-in> heftig => undefined method `lowercase!' for "DOG":String (NoMethodError) ... (https://eval.in/55565)

01:28 <heftig> oops

01:28 <heftig> >> var1 = "DOG"; var2 = var1; var1.downcase!; [var1, var2]

01:28 <eval-in> heftig => ["dog", "dog"] (https://eval.in/55566)

01:28 <heftig> >> var1 = "DOG"; var2 = var1; var1 = var1.downcase; [var1, var2]

01:28 <eval-in> heftig => ["dog", "DOG"] (https://eval.in/55567)

01:29 <heftig> also, this will fail:

01:29 <heftig> >> var1 = "DOG".freeze; var1.downcase!

01:29 <eval-in> heftig => can't modify frozen String (RuntimeError) ... (https://eval.in/55569)

01:29 <heftig> and this won't:

01:29 <heftig> >> var1 = "DOG".freeze; var1 = var1.downcase

01:29 <eval-in> heftig => "dog" (https://eval.in/55570)

01:30 <hfp> Ok, I think I get it now. I'm still not sure how this much granularity is useful but I guess I'll figure it out when I've learnt more.

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01:33 <hfp> Thanks!

01:33 <julian__1> hfp: When you say a method without a '!' is utterly useless that actually shows you've got the right idea

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01:33 <julian__1> it doesn't actually change anything, but I wouldn't say they were useless

01:33 <heftig> hfp: internally, .lowercase is pretty much just a .dup and a .lowercase!

01:34 <hfp> I'm getting there is a subtlety although I can't see any practical use yet. I just started learning so I guess this will come later.

01:35 <julian__1> hefp: say you wanted to give a user of your program a personalised greeting.

01:35 <julian__1> maybe you'd want to .upcase their name

01:35 <julian__1> but not .upcase! because that would rewrite their data

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01:37 <julian__1> hfp: puts username.upcase

01:38 <julian__1> that would output username in capitals, but keep username untouched

01:39 <hfp> I see. What I'm still not clear on is whether var1 = "dog".upcase and var2 = "dog".upcase! are equivalent or not.

01:39 <hfp> i.e. will var1 == var2 be true or false.

01:40 <julian__1> false :)

01:40 <julian__1> after running that code

01:40 <julian__1> var1 #=> dog

01:40 <julian__1> var2 #=> DOG

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01:41 <julian__1> oh wait

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01:41 <julian__1> hold on actually, I'm not sure there

01:41 <hfp> When I try I'm getting true

01:41 <julian__1> yeah

01:42 <julian__1> sorry you're right

01:42 <julian__1> they would be the same

01:42 <hfp> Ok, that's what was confusing me.

01:42 <julian__1> good, you're fine then :L

01:42 <hfp> I have a clear picture now, thanks!

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01:43 <julian__1> hfp: Good good, sorry I didn't read your code properly just then

01:43 <julian__1> they're called bang methods btw

01:43 <julian__1> if you want to google them

01:44 <hfp> Will do

01:44 <julian__1> thought there's not much to get

01:44 <julian__1> I think you probably understand them :)

01:45 <julian__1> just not when to use them...that'll just come with time I suppose.

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01:45 <julian__1> to be honest, bang methods are just there to keep things a little bit more concise

01:47 <julian__1> http://pastebin.com/index/CMVxbkEM

01:48 <julian__1> * don't click that

01:48 <julian__1> http://pastebin.com/Lqtqjv0x

01:48 <julian__1> ^ that one

01:49 <hfp> Thanks, I understand now

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02:02 <julian__1> instance_variable_set

02:02 <julian__1> is there a method like this to set variables?

02:03 <julian__1> OH, never mind

02:04 <whitequark> local variables?

02:04 <whitequark> no. technically you can do it with eval, but it's a bad enough idea that I won't explain how

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02:07 <hfp> Oh another easy one: is there something like i++ to increment i by 1 or do I have to write the whole i = i + 1 ?

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02:20 <whitequark> hfp: i += 1

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02:21 <hfp> Thanks

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04:18 <imperator> good evening

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05:33 <Barrin6> yo

05:33 <Barrin6> anyone mind helping me?

05:34 <Barrin6> http://pastebin.com/5exhfsKU

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05:37 <Barrin6> oh it stops looping when I use return

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12:17 <Mon_Ouie> You probably want to use #select

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13:48 <matti> Mon_Ouie: ;]

13:49 <Mon_Ouie> 'alut matti ;)

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14:02 * imperator just watched erlang, the movie, part 2

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14:15 <sluukkonen> outlaw techno psychobitch \o/

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14:31 <imperator> just reading some ryan dahl quotes now....lol

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14:34 <soahccc> I would like to make an application which runs as a daemon. It would perform a lot of IO tasks so it waits most of the time. These tasks are rescheduled like any minute or so and based on the results it takes actions. So a main thread + task runners. I also need to communicate with the process externally (console, API). What would be my options? I don't know if eventmachine would be good for this.

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15:19 <darix> soahccc: it could

15:20 <darix> soahccc: though i would look into existing job schedule things like sidekiq and resque

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15:33 <yorickpeterse> man it's so satisfying to be able to go to my own bathroom again after being in Paris for 2 nights

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15:38 <imperator> thanks for sharing that

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15:49 <julian_> How can I inspect an object?

15:49 <julian_> when .inspect isn't working?

15:49 <foucist> julian_: you can't

15:49 <foucist> julian_: could check and see what methods the object has

15:49 <julian_> that could work

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15:50 <julian_> how would one do that?

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15:50 <julian_> foucist: Actually, what I want to do is this

15:51 <julian_> I have a .self method. How could I actually get the value of .self?

15:51 <julian_> foobar.mymethod

15:51 <julian_> inside mymethod, how can I return "foobar" ?

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15:52 * imperator wonders what "inspect isn't working" means

15:53 <julian_> It simply returns the cryptic #<Object:0X39580349058> type of thing

15:53 <imperator> you want the class of self? self.class

15:54 <julian_> That's got it!

15:54 <julian_> Oh wait

15:54 <julian_> no, it hasn't

15:54 <julian_> I'll make a pastebin

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15:57 <julian_> imperator:

15:57 <julian_> something like this http://pastebin.com/z3vvFLbQ

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15:59 <imperator> julian_, no way to do that afaik, and really i gotta wonder why you would care what the caller's variable name is in the first place

16:00 <julian_> okay, well hopefully there is a better way to do this

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16:00 <imperator> what are you ultimately trying to accomplish?

16:01 <julian_> I'll make another pastie :)

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16:07 <julian_> imperator: http://pastebin.com/FDnSndBp

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16:08 <julian_> I also need the self as a string to make a query on an array, to check certain window attributes

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16:08 <julian_> I have an array that holds all window attributes

16:08 <imperator> julian_, i don't understand why're you're reopening Object

16:09 <imperator> why not have a "Window" class

16:09 <imperator> its attributes should be accessors

16:10 <julian_> imperator: Ah okay, I'll try that

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16:13 <julian_> imperator: So using attraccess I can make the 'self' availble to the method?

16:13 <julian_> or what?

16:14 <julian_> what do you mean by attributes, actually/

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16:14 <julian_> the parameters?

16:14 <ykk`> hey everyone

16:14 <ykk`> can someone tell me they think this is worth a try? http://www.amazon.com/Kinesis-KB500USB-BLK-Advantage-Contoured-Keyboard/dp/B000LVJ9W8/ref=cm_rdp_product

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16:15 <ykk`> my wrists are hurting and I read Pragmatic The Healthy Programmer. your wrists need to be in that rested position

16:15 <imperator> julian_, https://gist.github.com/anonymous/7057955

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16:16 <julian_> imperator: Thanks v much

16:16 <imperator> julian_, this is pretty basic stuff, i feel like you're trying to write a ruby program without really understanding ruby

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16:33 <soahccc> darix: well I thought about more "in ram" stuff. The footprint of the tasks is pretty small and I don't have a database backend. Scheduling is not pretty easy in my case and I don't want to rely on a system service (standalone if you want)

16:33 <soahccc> err. scheduling IS pretty easy in my case

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16:54 <r0bgleeson> ykk`: well if you ever get a spaceship that keyboard will match the interior

16:54 <ykk`> haha

16:55 <ykk`> it's not the prettiest but that company has a brushed metal one

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16:57 <r0bgleeson> i dont know much about those keyboards, not a concern i worry about too much

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18:08 <tubbo> i can't fuckin type on those things :(

18:08 <tubbo> i prefer to take frequent breaks instead. it's better for the rest of your body anyway...like your eyes, brain and legs.

18:08 <tubbo> speaking of which

18:08 <tubbo> :D

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18:11 <darix> ykk`: i have the MS natural key since 15y now. i can recommend those if you dont want to go to kinesis

18:11 <darix> ykk`: natural key 4000 atm

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18:21 <micalexa_> does ruby have a built in method to find out if a hash has more than one key value pair

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18:22 <tbuehlmann> micalexa_, yes, you can use #count or #size for that

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18:23 <havenwood> micalexa_: #one? #empty?

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18:24 <micalexa_> ok cool

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18:26 <havenwood> class Hash; def more_than_one?; self.size > 1 end end

18:26 <havenwood> or something like

18:26 <havenwood> class Hash; def one_or_less?; self.one? || self.empty? end end

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18:28 <micalexa_> havenwood: cool, I just need to do if hash.one? ... end. thats cool right?

18:29 <havenwood> micalexa_: yup, to check if one element in the hash

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18:30 <micalexa_> havenwood: just trying to limit thor input, unless you know a better way thor (thats if you are familiar with it)

18:31 <micalexa_> otherwise thanks

18:31 <havenwood> i don't know better way, just remember {}.one? #=> false

18:31 <micalexa_> yep cool

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19:26 <Barrin6> i have a very nooby question

19:26 <Barrin6> i just installed rubygems

19:26 <Barrin6> I opened up interactive ruby

19:26 <Barrin6> and did "gem-v"

19:27 <Barrin6> shouldn't it give me the gem version?

19:27 <Barrin6> nvm

19:27 <Barrin6> doesn't work in interactive ruby

19:27 <Barrin6> has to be in cmd

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19:29 <imperator> correct

19:30 <imperator> in irb, Gem::VERSION

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19:32 <Barrin6> wow in irb it's case senstive

19:32 <Barrin6> bastards

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19:33 <Barrin6> I think I'll go back to playing with projecteuler a little bit more

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20:36 <Barrin6> I have a question for you folks

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20:37 <Barrin6> in http://ruby-doc.org/core-2.0.0/Enumerable.html#method-i-inject the 4th example of inject

20:37 <Barrin6> is (5..10).inject(1)

20:37 <Barrin6> and then the block

20:37 <Barrin6> why is there an arguement of 1?

20:37 <Barrin6> where as in the 2nd example, the inject takes no argument

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20:39 <Mon_Ouie> The optional argument, as described in your link, is the initial value of the accumulator

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21:05 <Barrin6> when you say initial value of the accumatlor

21:05 <Barrin6> what does that mena?

21:05 <Barrin6> oh the starting value?

21:05 <Barrin6> by default I assume it is 0?

21:05 <Barrin6> if you leave out the argument

21:06 <Barrin6> so if you didn't include that initial value

21:06 <Barrin6> it would always return 0

21:07 <Barrin6> that makes sense

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21:07 <Barrin6> no it still works

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21:08 <Barrin6> i guess default is 1

21:08 <canton7> if you don't specify a default, it uses the first value in the collection

21:08 <canton7> "If you do not explicitly specify an initial value for memo, then the first element of collection is used as the initial value of memo."

21:08 <canton7> again, from the doc page you linked

21:08 <Barrin6> ohhh

21:08 <Barrin6> yea

21:08 <Barrin6> my bad

21:08 <Barrin6> thank you

21:09 <canton7> :)

21:09 <Barrin6> cool I solved projecteuler #6 in 5 mins

21:09 <Barrin6> so proud

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21:14 <rchar> I have a question

21:15 <canton7> I have an answer... What are the chances of it answering your question?

21:15 <rchar> is there a way, given a range of integers and some integer outside the range, to wrap the integer to a value inside the range

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21:16 <rchar> for example, 7.wrap_in (1..5) would give you 2

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21:17 <canton7> for ranges beginning at 1, yuse %

21:17 <canton7> *use

21:18 <rchar> right

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21:18 <canton7> for ranges starting > 1, remove the offset, mod, add the offset again

21:18 <canton7> >> 7 % 5

21:18 <eval-in> canton7 => 2 (https://eval.in/55864)

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21:18 <canton7> s/1/0 above

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21:19 <rchar> right

21:19 <rchar> does that handle numbers below the range?

21:20 <rchar> 3.wrap_in (4..10) => 10

21:22 <canton7> something like http://codepad.org/4DcBG9yM

21:22 <rchar> i'm guessing there's nothing in the standard library that has that kind of conversion

21:22 <canton7> and no, more fun and games required for numbers below the range

21:22 <Mon_Ouie> There's no problem with number below the range

21:23 <Mon_Ouie> >> ((3 - 4) % (10-4+1)) + 4

21:23 <eval-in> Mon_Ouie => 10 (https://eval.in/55866)

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21:23 <canton7> ooh true. I think I'm probably unreasonably scared of % involving negative numbers, from C

21:23 <Mon_Ouie> In Ruby, % (a.k.a mod) uses the sign of the rhs for its return valuesa

21:24 <Mon_Ouie> rem uses the sign of the lhs

21:24 <Mon_Ouie> Woops, except they're called modulo* and remainder*

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21:25 <rchar> thanks!

21:25 <Mon_Ouie> (In C89 it's undefined — or implementation-defined? — behavior, in C99 it behaves like remainder

21:25 <Mon_Ouie> )

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21:38 <r0bgleeson> Mon_Ouie: hey!

21:38 <r0bgleeson> you here?

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21:40 <Mon_Ouie> r0bgleeson: 'alut

21:41 <r0bgleeson> Mon_Ouie: salut, do you know if it is possible to create a manifest of ELPA packages? it's probably very easy to write a function to do that?

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21:42 <Mon_Ouie> I don't know how off the top of my head

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21:44 <r0bgleeson> Mon_Ouie: package-install-file might be the one

21:44 <r0bgleeson> checking it out

21:44 <r0bgleeson> thx :)

21:44 <Barrin6> if I finish all of project euler with ruby

21:44 <Barrin6> am I considered an expert? :D

21:45 <Mon_Ouie> A math expert

21:45 <r0bgleeson> being able to solve problems is more valuable than learning language X.

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21:45 <Barrin6> but not sure if math problems are applicable to real world problems

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21:46 <r0bgleeson> well, iirc, project euler problems aren't easy, so im sure you'll be able to apply to real world problems just fine

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21:46 <Barrin6> I'm not a programmer, but are most real world problems just math problems to a programmer?

21:47 <r0bgleeson> depends on the programmer

21:47 <r0bgleeson> in rails, i doubt it

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21:56 <Barrin6> why am I getting invalid octal digit on this? http://pastebin.com/dVz6wg2d

21:56 <Barrin6> for line 21

21:56 <Barrin6> it's pointing to the #8 on 0588

21:57 <workmad3> Barrin6: the number is spread across new lines, so each separate line is a different number

21:57 <Mon_Ouie> A number literal that starts with a "0" is parsed as octal

21:57 <Barrin6> ohhh

21:57 <Barrin6> shit

21:57 <workmad3> :)

21:57 <Barrin6> I'll just make it a string instead

21:57 <Barrin6> to avoid that problem

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22:24 <Barrin6> so proud of myself here http://pastebin.com/ySPM4uUx

22:24 <Barrin6> didn't think I would save it as quick

22:24 <Barrin6> but I did

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22:32 <workmad3> Barrin6: want a one-liner for that? :)

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22:34 <Barrin6> lol

22:34 <Barrin6> there is no way

22:34 <workmad3> val.split('').reject{|i| i == "\n"}.map(&:to_i).each_cons(5).map{|a| a.reduce(&:*)}.max

22:35 <Barrin6> there is a .each_cons(5)?

22:35 <Barrin6> didn't know that

22:35 <workmad3> yup :)

22:35 <workmad3> well, there's an each_cons method, that takes how many consecutive elements you want each time :)

22:35 <Barrin6> didn't know that

22:36 <workmad3> and now you do ;)

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22:36 <Barrin6> haha thanks

22:36 <Barrin6> http://ruby-doc.org/core-2.0.0/Enumerable.html#method-i-each_cons

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22:47 <Barrin6> damn

22:47 <Barrin6> #9 is hard to understand how to start

22:48 <workmad3> Barrin6: maybe start by considering the constraints

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22:49 <Barrin6> yea

22:49 <Barrin6> I have to break this down

22:49 <Barrin6> real good

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22:58 <Barrin6> fuck

22:58 <Barrin6> i'm stuck

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22:59 <ledestin> why isn't there a clock that can't be changed by user?

22:59 <drbrain> ledestin: there isn't?

23:00 <ledestin> you can't rely on Time.now - time due to the fact that time can be changed by user

23:00 <ledestin> drbrain: well, RTC on Linux, but that's not cross-platform

23:00 <drbrain> ledestin: you'll need a monotonic clock

23:00 <drbrain> Ruby 2.1 has support for reading it

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23:00 <drbrain> but it shouldn't be hard to FFI it up

23:01 <ledestin> drbrain: very cool, I'll research it

23:01 <ledestin> drbrain: FFI?

23:01 <drbrain> ledestin: wikipedia says clock_gettime and CLOCK_MONOTONIC is what you're looking for

23:01 <drbrain> ledestin: FFI (and the builtin fiddle) allow you to wrap C functions without writing a C extension

23:02 <ledestin> drbrain: thanks a lot mate, I was in a pinch, looking to make my own clock maybe

23:02 <workmad3> Barrin6: where are you stuck?

23:04 <Barrin6> standby

23:07 <Barrin6> I'm having trouble writing out the psuedo code

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23:10 <imperator> and internal clocks are reliable?

23:10 <workmad3> Barrin6: well, consider what you need

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23:12 * imperator would use net-ntp

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