<hays>
if i was going to randomly choose an alternative ruby interpreter what would be the best choice? im leaning towards jruby because it seems less experimental
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<hays>
(than rubinious)
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<smathy>
It'd depend on my reasons for choosing an alternative.
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<hays>
largely because i want threading to actually work
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<Arcaire>
I'd suggest MRI then.
<Arcaire>
jruby is good with threads iirc
<hays>
MRI? that is the one that seems to have a gil limitation where threads stay on one core
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<eam>
hays: jruby is pretty good
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<benzrf>
!troll benzrf
<benzrf>
looks like it needs perms, graft
<eam>
wow why'd benzrf just mute himself
<benzrf>
:>
<hays>
now i just have to get it to build on my mac. heh
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<eam>
hays: well, it's a jar
<eam>
you have java right
<hays>
yep
<hays>
i get quite the error out of macport
<hays>
macports.
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<Arcaire>
that's probably because you're using macports
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<masconejos>
hi all. I have a question about lazy enumerators. I was doing a project euler problem and created a lazy enumerator and then did a series of functional operations on it. However, I’m having issues witht he data type of the result. Sometimes it’s an array of numbers (which is what I expect), sometimes its an array of arrays, depending on how I use it. Anyone interested in offering some insight?
<smathy>
masconejos, a few of us were talking about precisely that the other day and we ended up punting.
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<Radar>
havenwood: and then I realised you already submitted a PR
<Radar>
havenwood: you are too cool
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<masconejos>
smathy, well, glad to know I’m not alone
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<smathy>
That is, unfortunately, the only comfort I can offer.
<masconejos>
smathy, it’s really the dichotomy between .each and .each.with_index that throws me. From experimenting, it seems like .each perhaps convert the lazy array to a fully-realized array and .with_index doesnt, but it’s still rather baffling
<masconejos>
…except .each.class still returns a lazy array
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<masconejos>
also the need to do .with_object.take_while{} rather than take_while.with_object{} was a little odd
<masconejos>
it’s also handy that apparently the (with_object) object is cloned every iteration, rather than modified, but at the same take there is a LOT going on under the hood that isn’t at all obvious. I would have excpeted that there was only one object that was modified each pass (at least that was my intent)
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<zacts>
hi rubyists
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<masconejos>
hi zacts
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<billy1234>
I have a question. If I have a string that consists of nothing but numbers, and I attempt to assign it to a DB record column of type integer
<billy1234>
will that throw an error?
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<Arcaire>
Anyone seen issues of DCell or ZeroMQ segfaulting before? I can only find half-decade-old bug reports on Github.
<Arcaire>
I'm not doing anything with it, just kind of starting a DCell (zeromq-backed celluloid actors, i guess) instance.
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<manveru>
billy1234: depends on the db...
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<manveru>
i know postgres won't allow stuff like that :)
<Arcaire>
Assuming ActiveRecord, you'll be fine.
<Arcaire>
AR automatically typecasts your input to the column type, so "12345" will be typecast to 12345 as an integer.
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<manveru>
i wouldn't call that "fine"...
<Arcaire>
Make sure it's more or less a number in a string, though. "!~1234" isn't going to be typecast to 1234.
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<manveru>
more like irresponsible :P
<Arcaire>
manveru: Why bother explicitly casting a string to an integer if you know the input is going to translate correctly?
<Arcaire>
You should be validating your input, sure, but the casting happens anyway.
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<manveru>
so what happens with "1.0" or "1/2" or "0x12" or "012"
<manveru>
what method does it use to convert
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<Arcaire>
Depends.
<Arcaire>
If your column type is an integer, it'll probably use some glorified form of to_i/.
<Arcaire>
So 1.0 is just going to become 1.
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<Arcaire>
"1/2" isn't an integer, nor a float. It's a fraction which is just a whole different ball game. That won't be casted properly. Same with most others you listed.
<Arcaire>
012 will go to 12 as expected.
<Arcaire>
If you want it padded out to three you can do that within the DB because you need to ensure integrity at that level anyway.
<manveru>
anw, my point is that implicit conversion is not safe
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<Arcaire>
That really depends on your input tbh.
<manveru>
you can argue that it's convenient, but that's the same reason people use mongodb or mysql...
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<manveru>
AR doesn't even bother checking string lengths even though it has the schema information
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<baweaver>
Bob had a problem, so Bob decided to use MongoDB
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<Arcaire>
Suddenly there's no problems anymore.
<Arcaire>
:D
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<baweaver>
Now Bob has two problems
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<rubirc>
GOODBYE CLOUD
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<rubirc>
WELCOEM BACK CLOUD
<Arcaire>
u ok m8
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<norc>
>> A = Struct.new(:a) { include Comparable; def <=>(o) a.to_i <=> o; end; }; a, b = A.new(1), A.new(2); a < b
<ruby[bot]>
norc: # => comparison of A with A failed (ArgumentError) ...check link for more (https://eval.in/560367)
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<norc>
This has got to be the most useless error message.
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<norc>
I mean the problem is obvious, but why is the error message this bad.
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<norc>
I would have an expected an "comparison of Fixnum with #<struct TelephoneNumber> failed"
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<norc>
or #<struct A> rather.
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<norc>
Or just comparison of Fixnum with A failed.
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<adaedra>
Bonjour
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<Caerus>
hello #ruby :)
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<roelof>
If I have a string let's say "abcdefghij
<roelof>
Can I divide it into pieces of 4 characters ?
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<Caerus>
roelof, you could use split with regex
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<roelof>
oke, I try to figure out how I can divide this : # ## ## ## ### ### ## # # ### ## # # # # # ### # ## # ## ## ### # # # # # # # # # # ### ### into parts of 5 characters for several days
<gregf_>
>> "abcdefghij".chars.inject("") { |str,c| str+=c; str.size == 4 ? begin;p str; "";end : str } # and another... there far too many. its Ruby!!
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<harry111>
hello
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<jackdaniel>
TheBrayn: swank is a protocol for working with the language process remotely
<jackdaniel>
for instance (for lisp), you may work through slime (emacs lisp program) with the Common Lisp implementation which "talks" swank
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<TheBrayn>
ah ok
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<jackdaniel>
for ruby it may be a fancy interface ala irb, but accessible in a standarized way
<jackdaniel>
afaik swank isn't lisp specific, but not 100% sure
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* harry111
learning ruby
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* jackdaniel
too :)
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<agent_white>
Mornin'
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<shevy>
agent_white we are on ruby 2.3.1 now!
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<exm>
Hey, so I'm starting to teach myself ruby, and I've got myself a file where most lines contain useful stuff that's being matched by a regex but not all, so in order to grab the initial hex number on the matching lines I wrote this: `File.readlines("file.txt").grep(regex).map{|l| regex.match(l)[0].hex}`. Is there a way to do that which doesn't match the line against the regex twice?
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<agent_white>
shevy: WOOOHOOO
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<atmosx>
exm not sure what you're asking, but sounds like it could be solved with a more fine grained regex.
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<exm>
atmosx: Basically, I've got an array of lines like "95AB stuff" and some that don't start with a number. What I want is an array containing all of the numbers
<zacts>
hi rubyists
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<exm>
Right now, I'm first filtering for the lines that match, then on each line doing the match and pulling out the part I need. I'm trying to find a cleaner way to do that
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<atmosx>
exm yeah it's a regex problem :-) - can you share a sample ?
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<exm>
Sure, so a line I want to turn into 3262 would look like "CBE *" and a line I want to completely skip would look like "# this is a comment"
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<hanmac>
instead of readlines(path).grep(regexp) wouldn't read(path).scan(regexp) be better?
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<exm>
hanmac: probably! Thanks, I didn't see that method
<atmosx>
exm there's rubular.com to try ruby regex
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<atmosx>
you could actually pick the lines you want and extract the items you need 1 one pass I guess.
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<eam>
well, if he really does have line based input with only one number per line he probably does want to iterate lines
<exm>
Yeah, that's what I was trying to figure out how to do
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<exm>
and I would prefer avoiding reading the entire file into memory, though the machine I'm sitting at now can do it
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<hanmac>
exm: readlines already does read the entire file into memory ... if you might get that problem, checkout File::foreach
<eam>
exm: what you have originally seems fine, just remove the grep and conditionally do nothing if the regex doesn't match in the map {}
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<exm>
Okay, thanks
<eam>
(and switch to a per-line loop like hanmac suggests)
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<shevy>
damn
<shevy>
I thought for a moment that eam was talking to himself here
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<baweaver>
eam always talks to himself
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<baweaver>
it's just consequentially interpretable as conversation to an outside party
<eam>
could you please not interrupt us
<eam>
haha
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<eam2>
we like it better that way
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<eam>
eam2: hello you amazing, beautiful person
<eam2>
eam: <3
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<eam2>
shevy is just jealous
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<eam>
more jelly than a pectin factory
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<inageru>
I ran into an oddity with ruby BigDecimal.new using precision >8 and float input: 0.03 becomes 0.029999999. This also happens with 0.06 (.059), 0.09 (.089) and 0.009(.0089). It's not a rounding issue with output, the value is stored this way: #<BigDecimal:7fce8113b710,'0.29999999E-1',9(27)> Can someone help me understand this?
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<lagweezle>
My guess is that floats are ... well, the way they are stored in binary causes a lot of interesting issues.
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<inageru>
Are there any docs on the binary implementation of bigDecimal? I understand there can be precision issues with floats but this seems somewhat inconsistent.
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<inageru>
For example, using a string instead of a float to instantiate: BigDecimal.new('0.03',8) == #<BigDecimal:7fce821b7508,'0.3E-1',9(18)>
<eam>
inageru: the float value of 0.03 is actually 0.02999999
<eam>
this is a problem with float, not bigdecimal
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<inageru>
ah, I see
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<lagweezle>
>> BigDecimal.new(0.2,8)
<ruby[bot]>
lagweezle: # => uninitialized constant BigDecimal (NameError) ...check link for more (https://eval.in/560815)
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<borodin>
howdy folks
<borodin>
I'm using rbenv (via puppet) to install gems on a box. I'm having a permissions issue. How do I completely remove all gems on a box (as if no gems had ever been installed)?
<borodin>
so I can wipe out the environment and start over
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<al2o3-cr>
borodin: gem uninstall --all ?
<borodin>
thing is, gem uninstall doesn't seem to really work
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<jdelaney>
Any recommendations for resources on learning Ruby (and Sinatra) that are written for people who already have experience in other languages? I wanna avoid tutorials that go over what an if statement is
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<havenwood>
jdelaney: The Well-Grounded Rubyist (the Second Edition is up-to-date) is a nice introduction that gets right into things.
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<havenwood>
jdelaney: You might enjoy the Koans even though they start out very basic.
<jdelaney>
havenwood: Thanks! I'll check all of those out
<havenwood>
jdelaney: I'd suggest looking at Roda as well as Sinatra. It's a bit harder to find material on but the code and it's plugins are very worth a read: http://roda.jeremyevans.net/index.html
<havenwood>
its*
<jdelaney>
havenwood: I'll look at that as well
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<smathy>
Roda is very nice.
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<roelof>
Can I somehow solve this deprecation error : DEPRECATION] `last_comment` is deprecated. Please use `last_description` instead. when I do rake ?
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<dsimon>
roelof, are the calls to last_comment coming from your code?
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<roelof>
is it not my code. Im doing exercises from a learn ruby github course
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<dsimon>
hm, yeah, this rabbit hole is deeper than i expected :-)
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<dsimon>
are you using a Gemfile in your project?
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<dsimon>
in the exercises, i mean
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<roelof>
yep, a very little one
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<roelof>
dsimon: this is the whole gem file : gem "rake" gem "rspec", "~>2.0"
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<dsimon>
hm
<dsimon>
ok, it looks like this has been fixed in recent rspec
<dsimon>
however going from rspec 2 to rspec 3 may break some tests :-\
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<roelof>
oke, I think I have to life with this message
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<cschneid>
Is there a way to build a rubygem that compiles a native extension if possible, but if anything goes wrong (no make installed, no C compiler, compiler fails), it continues installing and falls back to a ruby implementation of the functionality instead?
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<Papierkorb>
cschneid: the redis gem (which is ruby only) does this by testing if the hiredis gem (which is the C ext) is available
<Papierkorb>
So yeah, not a single-gem solution .. but atleast robust
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<cschneid>
yeah, releasing two gems is an approach. not-native and native, with approriate shared code between the two
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<cschneid>
was hoping for a one-size-fits-all approach: "Install xyz gem, and you get bonus C code if it's possible"
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<cschneid>
which seems surprisingly difficult
<Papierkorb>
cschneid: also, what happens when the user wants to use the C ext, but is currently fighting with the compiler? How to even detect that it's "not possible"?
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<Papierkorb>
Or the user later wants to use the C version or the ruby version instead due to changed requirements?
<cschneid>
yeah. "not possible" may mean: "attempt, then fail w/ a reasonable message: 'Couldn't install native extension, falling back to ruby. Log @ /tmp/log_file.loglog'
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<borodin>
anybody know why a gem shows up in gem list, but when you require 'gem' it returns false?
<havenwood>
borodin: `false` means it's already been successfully required
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<borodin>
oh really?
<borodin>
I wonder how I can check to see if it's working?
<borodin>
cool thanks that's helpful info!
<Papierkorb>
borodin: if it doesn't exist, it'll raise a LoadError
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<borodin>
it's healthy - thanks guys
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<borodin>
spent half the day trying to fix something that wasn't broken
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<highbass>
i am looking to output logs from my ruby app into json format (will use the output to forward to elasticsearch) ... anyone have any experience with this?
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<Papierkorb>
highbass: I use the logging gem which can output JSON data OOTB. works fine, but didn't try it yet with ELK
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<highbass>
ahh ok taking a look
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<mlakewood>
Im using the Holidays gem, and Its giving me an UnknownRegion Error. It seems like I might have to instansiate it or something? But the documentation doesnt say anything about that. Anybody have any experience with this>
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<crystal77>
How feasible is it to learn Ruby, if we don't use it at work? Everything is in Python, and my interest is being a Rails dev.
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<justinabrahms>
crystal77, it's easier if work helps, but do-able otherwise. Just means side projects.
<justinabrahms>
Anyone have thoughts on how I mock a free function with rspec's mocks? I have a function calling `daemon_msg "message", :object => a` I want to assert the message and arguments are what I think they are.
<crystal77>
A bit jealous of people who actually use ruby/rails on the job, as I'm sure that makes it much easier to learn.
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<tfitts>
I'm trying to encode either 'FF' or 244 into a byte like "\xFF", is there a method you can call on a string or an integer to convert it to a byte?
<tfitts>
sorry, not 244, 255
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<tfitts>
pack, got it
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<eam>
tfitts: 255.chr
<eam>
but yeah pack/unpack are great for that
<tfitts>
or that, cool, thanks
<eam>
the "byte" will be a String
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<amincd>
Hi, why is it that when I create an IO object, with io = IO.new(IO.sysopen("filename", "a+"), "a+"), write to it with io.puts "new line", and read the file, with p IO.binread("filename"), it doesn't display the "new line" I added?