#ruby-lang on 2014-09-05 — irc logs at freenode.irclog.whitequark.org

2014-07-11 14:07 ljarvis changed the topic of #ruby-lang to: Ruby 2.1.2; 2.0.0-p481; 1.9.3-p547: http://ruby-lang.org || Paste code on http://gist.github.com

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01:38 <law> hey all, in Ruby 2.1.2, if I know an array contains a certain string (thanks to Array.include?) but I want to know what position its in, how do I do that?

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01:43 <womble> law: Array#index

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01:51 <law> awesome, thank you!

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02:05 <rayrai> test

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02:07 <centrx> rayrai, test failed

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02:32 <rayrai> simple question

02:33 <rayrai> anything=gets.chomp

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02:33 <rayrai> if i input anything = 1

02:33 <rayrai> will the ruby consider it as a string or integer

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02:34 <centrx> rayrai, anything you type in is a string

02:34 <centrx> rayrai, gets stands for get String

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02:35 <rayrai> ok

02:35 <rayrai> but I am trying to evaluate if the given input is integer or string

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02:36 <rayrai> while anything.empty? || anything.is_a? Integer

02:36 <rayrai> it's not wokring

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02:37 <rayrai> anything.to_i.is_a? Integer

02:37 <rayrai> how do you evaluate it

02:37 <centrx> rayrai, anything.to_i.nonzero? if zero is not an expected number to be entered

02:37 <rayrai> thanx for you help centrx

02:38 <centrx> rayrai, or anything =~ /^\d+$/

02:38 <rayrai> i prefer not to use regex at early stage

02:38 <centrx> anything.to_i.nonzero? && anything != "0"

02:38 <centrx> actually

02:39 <rayrai> what is that nonzero do

02:39 <centrx> it's equivalent to != 0

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02:39 <centrx> >> "".to_i

02:39 <eval-in____> centrx => 0 (https://eval.in/188570)

02:39 <centrx> >> "quack".to_i

02:39 <eval-in____> centrx => 0 (https://eval.in/188571)

02:39 <centrx> >> "55".to_i

02:39 <eval-in____> centrx => 55 (https://eval.in/188572)

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02:39 <centrx> >> "55ddf".to_i

02:39 <eval-in____> centrx => 55 (https://eval.in/188573)

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02:41 <rayrai> but if you already didi anything.to_i.nonzero? is this necessary && anything != 0

02:41 <rayrai> can't we just evaluate in one code anything.to_i.nonzero?

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02:43 <centrx> rayrai, If "0" is an acceptable value for a user to enter, anything.to_i.nonzero? will identify it as "not an integer"

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02:44 <rayrai> ok

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02:45 <rayrai> while anything.empty? || anything.is_i.nonezero?

02:45 <rayrai> could you help me to debug this one

02:45 <rayrai> centrx

02:46 <rayrai> i am trying to perform while loop

02:46 <rayrai> while anything.empty? || anything.is_i.nonezero?

02:46 <centrx> ok

02:47 <centrx> seems okay?

02:47 <rayrai> https://eval.in/188582

02:47 <rayrai> check the code

02:47 <bnagy> loop do begin num = Integer(gets.chomp); break rescue # ask again end end

02:48 <rayrai> the program should only accept string

02:48 <rayrai> if you input three you'll get error undefined method `is_i' for "3":String

02:49 <rayrai> i mean Integer 3

02:49 <centrx> rayrai, It's to_i, http://www.ruby-doc.org/core-2.1.2/String.html#method-i-to_i

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02:50 <bnagy> to_i probably isn't what you want.

02:50 <bnagy> >> 'retarded crap'.to_i

02:50 <eval-in____> bnagy => 0 (https://eval.in/188583)

02:51 <centrx> bnagy, The idea was: def integer?(str); str.to_i.nonzero? && str != '0'; end

02:51 <centrx> bnagy, He doesn't want to start using regex yet

02:51 <bnagy> why would you do that?

02:52 <centrx> check if string is an integer?

02:52 <bnagy> that's what Integer is there for

02:52 <centrx> bnagy, Integer() with rescue?

02:53 <bnagy> yes

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02:53 <rayrai_> test

02:53 <rayrai_> ok backagain

02:54 <rayrai_> hey centrix thank for your help, i am checking the documentation from your link

02:55 <centrx> rayrai_, Here's an alternative using Integer(): https://gist.github.com/anonymous/9d6dd038871ac27ab35c

02:56 <rayrai_> ok let me check

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02:57 <centrx> bnagy, Would you say using rescue for control flow is bad practice? Is Integer()/rescue just the only reliable way to do this?

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02:59 <rayrai_> centrx I was trying to exact opposite

02:59 <rayrai_> only accept Integer

03:00 <rayrai_> until (String(human) rescue nil)

03:00 <rayrai_> I know it won't work

03:00 <rayrai_> I mean the program should accept only string

03:01 <centrx> rayrai_, ok, you can change the until back to a while then

03:01 <rayrai_> ok let me try

03:01 <centrx> rayrai_, while x == until !x

03:02 <rayrai_> yeap it worked..thanks

03:03 <rayrai_> I am little bit curious about rescue nil

03:03 <rayrai_> what role did rescue nil played in the program

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03:04 <centrx> rayrai_, Look up "exception handling"

03:04 <centrx> rayrai_, Integer(x) throws an error if x is not an integer/convertible to an integer

03:05 <centrx> rayrai_, rescue catches that and turns it into a "false/nil" (falsey) result, instead of a program-ending error

03:10 <rayrai_> I was googling about rescue nil and your explanation "rescue catches that and turns it into a "false/nil" (falsey) result, instead of a program-ending error" make every clear in one sentence

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03:12 <rayrai_> Cheers centrx thanks again, In a mean while I am going deep into exception handling

03:12 <centrx> You are welcome

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06:30 <law> hey all, any ideas why I'm gettin an argument error on this? http://pastebin.com/fDCWuX9x

06:30 <law> specifically, ./acm-h.rb:11:in `compress': wrong number of arguments (0 for 1) (ArgumentError)

06:31 <womble> law: Because you're not passing an argument to compress when you said it needed one.

06:32 <law> is "compress(input)" not passing it an argument?

06:32 <womble> Put another way, don't name global variables (or variables in general) the same as methods, unless you want to drive yourself crazy.

06:32 <law> I'm... afraid I don't understand

06:32 <womble> Line 11 is the declaration of the method, not an invocation

06:33 <womble> You're invoking the compress method on, for example, line 14 without an argument

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06:33 <law> oh snap, I think I see what's up

06:33 <law> thank you!

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06:45 <law> why is "compress = tmp = dst = []" not equivalent to "compress = [], tmp = [], dst = []"?

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06:47 <whitequark> in first case you create a single array, in second case you create three different arrays

06:47 <law> so the first way, compress is always equivalent to dst, no matter what operations I perform on compress but don't perform on dst?

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06:49 <whitequark> unless you reassign either compress or dst, yes

06:54 <Benny1992> @law u could also easily check with compress.object_id & dst.object_id :)

06:55 <law> good point :-)

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07:22 <law> so, I want to read in lines from a file, to an array

07:22 <law> but I want the array to be split along word boundaries, not newlines

07:23 <law> f = File.open(ARGV[0]) or die "Unable to open file"

07:23 <law> f.each_line { |line| input.push line }

07:23 <law> gives me an object like so:

07:23 <law> "[\"This is a very very simple test string very is a\\n\", \"quite simple line for testing very simple strings\\n\"]"

07:24 <law> I've tried doing 'input.push line.split', but that gives me two big arrays containing a multitude of smaller arrays

07:25 <law> hrmm, looks like .flatten! is my friend

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07:55 <law> any thoughts on how I can split a string along a non-word boundary?

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07:56 <law> i.e. I need "x-ray" to split into ["x", "-", "ray"]

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07:56 <law> or "Jim's" to split into ["Jim", "'", "s"]

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08:02 <DefV> >> "x-ray".scan(/(?:\w+|\W+)/)

08:02 <eval-in____> DefV => ["x", "-", "ray"] (https://eval.in/188666)

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08:02 <DefV> >> "Jim's".scan(/(?:\w+|\W+)/)

08:02 <eval-in____> DefV => ["Jim", "'", "s"] (https://eval.in/188667)

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08:02 <DefV> law: ^^

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08:06 <jhass> >> "x-ray".split(/\b/) # law

08:06 <eval-in____> jhass => ["x", "-", "ray"] (https://eval.in/188671)

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08:08 <law> is there a generic form I can use that will work on - ' , . ! ? etc?

08:09 <law> oh wait, that does look like a generic form... snap!

08:09 <jhass> >> "x-ray Jim's foo!bar this,too or.this yep?yep".split(/\b/)

08:09 <eval-in____> jhass => ["x", "-", "ray", " ", "Jim", "'", "s", " ", "foo", "!", "bar", " ", "this", ",", "too", " ", "or", ".", "this", " ", "yep", "?", "yep"] (https://eval.in/188672)

08:09 <law> you rock, anonymous regex master :-)

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08:12 <law> ok, I am doing something very, very wrong here: http://pastebin.com/WEjJYhz2

08:12 <law> I get the same output regardless of whether I use split or scan

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08:15 <jhass> law: neither are self modifying (they can't since they would change the type), so each is not going to work

08:17 <law> I'm not quite sure I understand all the intricacies of what you just said, but... how can I make it do what I want? :-)

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08:18 <jhass> well, it's not tremendously clear what you want but my best guesses are .map or .flat_map

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08:20 <law> I'm reading in a file that has a fairly wide variation in punctuation, emphasis, etc

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08:21 <law> and I want all the words to be elements in an array, along with whatever weird punctuation may come with it. the weird punctuation should be their own elements, so I can manipulate the words (really, enumerate them and remove the duplicates) without too much hassle

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08:22 <jhass> File.read('my_file').scan_or_split

08:22 <jhass> no need to split into words first

08:23 <law> http://pastebin.com/dPewvJvG

08:23 <law> so I can replace that line.scan(/\w+/) with split(/\b/) ?

08:24 <jhass> or just use the code I showed and git rid of all the unnecessary stuff ;)

08:24 <jhass> also always use the block form of File.open or helper methods like File.read or File.write

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08:25 <jhass> that way you don't leak filehandles

08:25 <jhass> a = []; something.else {|i| a << i / a.push(i) } can almost always replaced by a .map

08:26 <jhass> something.map { }.flatten is most likely something.flat_map { }

08:27 <law> cool! TIL!

08:30 <law> and it seems that I can't just de-serialize my array with successive invocations of .flatten!

08:31 <law> I read it in as plain text, chopped it into a monster array, "did stuff" do it, now I want to write it back out as plain text, hopefully still respecting newlines, etc

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08:32 <jhass> flatten by default is already recursive

08:32 <law> actually, I should be able to iterate with .each on my array... let me try that and see how badly it mangles things

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08:33 <jhass> >> [[[:a, :b], :c], :d].flatten

08:33 <eval-in____> jhass => [:a, :b, :c, :d] (https://eval.in/188704)

08:33 <law> lol, that mangles it terribly. everything has its own newline

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08:36 <jhass> you probably want Array#join

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08:36 <law> you're probably right

08:36 <dostoyevsky> What package do you recommend these days for generating a excel xls?

08:36 <law> sorry, I'm not normally this derpy, but it's 1:30am where I am

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08:41 <law> eeexcellent, now we're cooking with gas

08:41 <yorickpeterse> morning kids

08:41 <law> one minor problem. the line.split(/\b/) is picking up spaces and making them into their own array

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08:49 <jhass> their own array? their own items, sure

08:49 <law> err, yes, their own items

08:49 <jhass> also not sure why you still read in lines

08:49 <jhass> if you want words anyway

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08:50 <law> what's a better way?

08:50 <jhass> File.read() and split that into words directly

08:50 <law> fair enough. thank you!

08:51 <law> I think I'll wait until tomorrow to implement that... I am awful tired

08:51 <law> thanks for all your help though

08:51 <jhass> make sure to come back and let us review your whole script ;)

08:52 <law> http://pastebin.com/XvhxfwzN

08:52 <law> go for it :-)

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08:57 <jhass> I thought you want to grab some sleep first? ;)

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09:02 <yorickpeterse> benlovell: congrats on the ltd, so you'll be doing freelancing now?

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10:53 <jammanbo> Please don't yell, but is anybody using massive_record/hbase/thrift. Having bother, evidently from thrift, connecting from ruby to hbase on my mac. "Thrift::ProtocolException: No version identifier, old protocol client?"

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16:49 <Phrogz> Anyone here used any wav file libs? I'm trying to determine the length of a .wav in ms

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17:26 <avdi> Phrogz: I haven't used a lib, but I've run avprobe as a subprocess to get length data about video files

17:27 <Phrogz> avdi: Thanks; I got the info I needed from ffmpeg.

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17:43 <ruby-lang538> I have a class with an attr_accessor, I'm getting a "wrong number of arguments" error when I try to instantiate the class with a hash. What am I doing wrong? Pastebin here - http://pastebin.com/efnvrjPx

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17:44 <wallerdev> thats not how accessors work

17:44 <wallerdev> lol

17:44 <wallerdev> [

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17:44 <ruby-lang538> oh, i feel dumb then

17:45 <wallerdev> you can do g = Game.new; g.teamname = 'test'

17:45 <ruby-lang538> thanks lol

17:45 <centrx> ruby-lang538, def initialize always needs some boilerplate

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18:17 <law> how does one search an array for the presence of numbers? I'm trying "array.include?(/0-9/)", but it's consistently returning false

18:17 <law> do I have my pattern syntax wrong, or am I using the wrong method entirely?

18:17 <yorickpeterse> You can not search arrays using regular expressions

18:17 <yorickpeterse> array.include?(/0-9/) literally means "Does this array include the regular expression object /0-9/"

18:17 <law> well poop. whats a better way to do it?

18:17 <yorickpeterse> You can however do something like this:

18:18 <yorickpeterse> >> range = 0..9; [1,2,3,4,5,6,10,12].select { |val| range.cover?(val) }

18:18 <eval-in____> yorickpeterse => [1, 2, 3, 4, 5, 6] (https://eval.in/188969)

18:18 <wallerdev> i dont think thats what he wanted lol

18:18 <yorickpeterse> oh, presence of any numbers

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18:18 <wallerdev> probably more like array.any? { |str| str =~ /0-9/ }

18:19 <yorickpeterse> >> [10, 20, 'fooo'].select { |val| val.is_a?(Numeric) }

18:19 <eval-in____> yorickpeterse => [10, 20] (https://eval.in/188970)

18:19 <yorickpeterse> you can then do

18:19 <yorickpeterse> >> [10, 20, 'fooo'].select { |val| val.is_a?(Numeric) }.empty?

18:19 <eval-in____> yorickpeterse => false (https://eval.in/188971)

18:19 <yorickpeterse> assuming they are actual numbers, not strings

18:19 <jhass> or just .all? / .any?

18:19 <yorickpeterse> either way, Enumerable#select is your friend here

18:19 <yorickpeterse> jhass: Yeah I guess that works too, I hardly use those

18:19 <yorickpeterse> too cool for me

18:20 <AKASkip> use grep

18:20 <jhass> if it's an array of strings

18:20 <law> it is an array of strings

18:20 <AKASkip> >> [10,20,'fooo'].grep(Numeric)

18:20 <eval-in____> AKASkip => [10, 20] (https://eval.in/188972)

18:20 <jhass> then grep

18:20 <jhass> oh, grep does #===

18:21 <law> can I pattern-match in grep, a-la (/[0-9]/)?

18:21 <jhass> didn't realize, nice

18:21 <AKASkip> yup

18:21 <yorickpeterse> AKASkip: oh neat, didn't know you could give grep a class too

18:21 <jhass> so .grep(/\d/).any? yeah

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18:21 <AKASkip> won't work with numerics though

18:22 <jhass> he said it's strings

18:22 <AKASkip> then it's cool

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18:46 <law> hrmm, I am having a heck of a time figuring out where I've gone wrong here: http://pastebin.com/Fih9av7b

18:47 <law> my functions work great if the output of one is fed directly to the input of the other

18:47 <law> but if I write the output of one to a file, then later try to read it in for the other, it... doesn't decompress

18:47 <law> and I don't know why

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18:57 <wallerdev> law: try reading your file to a string and using p file_as_string to see what the actual ruby string looks like and see how that differs

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18:58 <sarkyniin> is there an equivalent to "JSON.stringify" in ruby?

18:58 <wallerdev> require 'json'

18:58 <sarkyniin> AKA something that takes a js object and transforms it into a hash/json/something

18:59 <wallerdev> then Object#to_json ?

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18:59 <sarkyniin> wallerdev: well, I have a document with a js object in it

18:59 <sarkyniin> and I want to parse it using ruby :/

19:00 <wallerdev> theres JSON.parse

19:00 <wallerdev> if its in a string?

19:00 <centrx> sarkyniin, http://www.ruby-doc.org/stdlib-2.1.2/libdoc/json/rdoc/JSON.html

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19:06 <sarkyniin> centrx / wallerdev : in the end, I used execjs

19:06 <sarkyniin> but thanks anyway

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19:39 <sarkyniin> is there any reason as to why the JSON module's pretty_generate won't work?

19:39 <sarkyniin> it produces the same output as dump

19:40 <zmartAzz> I'm new to this language and really want to master it. I've bought "The Well-Grounded Rubyist 2nd ed" but are there any other (this time free) resources I should start with or is it ok to jump on that book? Got experience from Java (computer science class). :)

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19:45 <centrx> zmartAzz, The Pick-Axe book is another good standard, newest version is available at https://pragprog.com/book/ruby4/programming-ruby-1-9-2-0

19:45 <centrx> zmartAzz, Old version is available free online at http://ruby-doc.com/docs/ProgrammingRuby/

19:46 <centrx> zmartAzz, Also check Ruby Koans and Ruby Monk

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19:46 <centrx> zmartAzz, and there's some good info on this topic at https://gist.github.com/waseem/5068050

19:46 <havenwood> zmartAzz: http://tryruby.org/ is a nice quick intro. since you've done a bit of Java before, just going through Well-Grounded makes sense. ;)

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19:47 <havenwood> centrx: koans and monk, you'd think we were a religious order

19:47 <havenwood> centrx: but good stuff! ;)

19:47 <centrx> The way of the Ruby is the way of the Way

19:48 <zmartAzz> Thanks guys :) Yeah, I've been doing some coding with java in the computer science class. The language doesn't appell to me that much but Ruby did. So I got a go with my professor to do all the assignments and do the finals in Ruby :P So hope to learn enough to do so :)

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19:49 <zmartAzz> I will try out the intro you gave me havenwood and read both books (switching back and forth) from the newest edition programming ruby and well-grounded

19:49 <zmartAzz> That should cover most of it :)

19:49 <sarkyniin> is it just me or is rubygems having problems?

19:49 <centrx> Java has been known to cause brain damage

19:49 <sarkyniin> I can't seem to gem install packages.

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19:50 <zmartAzz> I love details and java is ugly compared to ruby and python, but ruby is so far the one I want occupying my brain cells :P

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19:53 <zmartAzz> centrx, the gist link you gave me were just what I needed! Thanks

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20:08 <sarkyniin> ERROR: Could not find a valid gem 'json' (>= 0), here is why:

20:08 <sarkyniin> Unable to download data from https://rubygems.org/ - Errno::ETIMEDOUT: Connection timed out - connect(2) for "api.rubygems.org" port 443 (https://api.rubygems.org/latest_specs.4.8.gz)

20:09 <sarkyniin> huh.

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21:05 <ruby-lang259> hello

21:06 <ruby-lang259> anyone in here

21:06 <wallerdev> nope

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21:06 <ruby-lang259> :)

21:07 <ruby-lang259> newbie here

21:07 <ruby-lang259> is this chat very active?

21:08 <centrx> sometimes

21:08 <centrx> There is also #ruby and #rubyonrails

21:08 <ruby-lang259> gotcha

21:08 <ruby-lang259> what are your thoughts on something like appacademy.io

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21:09 <centrx> sounds similar to Codecademy

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21:09 <pipework> ruby-lang259: not that positive

21:10 <ruby-lang259> you teach urself with codeacademy

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21:10 <ruby-lang259> appacademy other programmers will teach you and help you find a job - tuition is like 15k or 20% of your salary for a year

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21:11 <ruby-lang259> they teach you fullstack

21:11 <centrx> ruby-lang259, I would recommend cheaper one-week bootcamps, in person. Maximize your investment by learning it yourself ahead of time and continuing afterwards

21:11 <pipework> I think the best situation for anyone using those 'schools' is when you're already on your way and just need that kind of environment to get you further along on your current path.

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21:12 <ruby-lang259> i dont know where to start is the problem

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21:12 <pipework> However, there are some of these 'schools' that purport to take anyone and turn them into a bonafide employable programmer in N weeks/months. These are the things you should probably avoid.

21:13 <pipework> ruby-lang259: What do you like to do to learn? Read, tinker, break things?

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21:14 <thagomizer> I agree with pipework. If you are already on your way, really want to be a developer, these schools can provide good mentoring and help you focus on employable skills.

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21:14 <thagomizer> That said I know far more bootcamp grads who are unemployed than i do employed ones

21:14 <ruby-lang259> \help

21:14 <thagomizer> I'd also avoid any program that hasn't had at least 3 classes of grads and can give you the average starting salaries and how long it took their folks to find jobs.

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21:17 <ruby-lang259> right, there are some out there that you only have to pay once you are employed

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21:17 <pipework> ruby-lang259: I think you should decide whether you excel in insitutional learning centers, reading, tinkering, or however you learn best and whatever keeps you interested.

21:17 <ruby-lang259> i would like to learn as much as I can, not sure how far I can get on my own

21:18 <pipework> Knowing that, you'll be able to plot a course and level up your awesomeness.

21:19 <ruby-lang259> just constantly running into things I dont understand

21:21 <centrx> *constantly reading up on things I don't understand

21:21 <centrx> ^ Corrected that for you

21:22 <ruby-lang259> true - if i like to tinker around with code what would you suggest

21:23 <pipework> ruby-lang259: I'd suggest you either take someone else's app apart and changing it to do things it wasn't originally meant to do, or if you would prefer, build something yourself and just have fun trying to get things to work, add new features.

21:24 <ruby-lang259> ok i'll try that

21:24 <ruby-lang259> where can i find code

21:24 <pipework> Either way, you'll have to pick either a target platform of some kind. This could be anything, like a desktop app, web app, server app, tooling, anything that sounds neat to you.

21:24 <pipework> ruby-lang259: github.com

21:24 <ruby-lang259> like github?

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21:54 <thagomizer> ruby-lang259: if there's a user group near you they might have some ideas as well. I'm in Seattle and Seattle.rb has helped a number of new folks figure out where to start and what to look at next based on their goals. The local folks will also have a good idea if a particular bootcamp is worth the money.

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21:55 <pipework> thagomizer: Maybe you mean ruby-lang605, if that's the same person as before.

21:55 <ruby-lang605> thanks pipework

21:56 <thagomizer> thanks pipework

21:56 <ruby-lang605> the chirp caught my attention

21:56 <thagomizer> sorry about that

21:57 <ruby-lang605> I'll definitly check out any local meetups. Any other beginners in here interested in doing a google hangout shoot me a message

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23:20 <julianhurley> hi

23:21 <centrx> !hi

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23:23 MichD is now known as michd

23:24 <julianhurley> http://pastebin.com/ngjAHWwa

23:24 <julianhurley> Just wondering if it's possible to do this, to update a variable inside a method in a block

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23:24 <julianhurley> no worries if not possible just experimenting :)

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23:26 <centrx> julianhurley, You can do it with instance_eval, but that is ugly and slow

23:26 <centrx> julianhurley, I think if you pass yield(foo) it will not change the local variable, but I don't konw

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23:27 <|jemc|> julianhurley: you _could_ modify a local variable if it was in the enclosing lexical scope of the block

23:28 <julianhurley> |jemc| Could I have a paste?

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23:30 <|jemc|> heh, I guess not

23:30 <bnagy> https://eval.in/189131

23:31 <bnagy> not what you asked, but that's what you should do :) note that foo in the block is irrelevant, only the return value matters

23:31 <|jemc|> bnagy: he left

23:31 <bnagy> ha

23:31 <bnagy> lightweights

23:32 <|jemc|> err. s/he left, I mean

23:32 <|jemc|> being unaware of the indivdual's gender

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23:46 <jhass> don't you say they as gender neutral thing now?

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