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<zacts>
hello #ruby
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<shayan_>
Would sum = sum + parseInt(num), represent a string concatenation, or is that an addition operator?
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<shayan_>
more specifically, is, sum + parseInt(num) representing a string concatenation, or is that an addition operator?
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<passerine>
it would probably depend on the class of sum and the class of the return value of parseInt, whether they are of a numeric class, or String
<shayan_>
The parseInt() function parses a string and returns an integer.
<passerine>
and sum?
<shayan_>
var sum;
<shayan_>
sum = 0
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<shayan_>
sum = sum + parseInt(num);
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* passerine
probably missed something before joining the channel
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<chessguy>
so i'm hoping someone can give me a hand with popen. i have this code: IO.popen("/path/to/some/executable", "rw") {|io| io.puts "foo"; io.close_write; io.read(nil); }. some of the time, though, i'm getting a broken pipe on the puts line
<chessguy>
is there some way to diagnose what's happening with the process i'm spinning up?
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<k200>
hi
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<k200>
i have a recursive function http://paste.ubuntu.com/23352230/ . I wont to know that, will the function call in if block return the key to main call if its teh same key or it will just return that value only to if block and not back to original caller? e.g. if mykey = change_api_key(key) and assume that here the key == new_key will "mykey" get a new_key eventually or not?
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<k200>
i am confused because i am not using "return" statement in if block. its used only in else block.
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<Burgestrand>
k200 I don't quite understand your question. For one, `return` here is redundant, Ruby returns the value of the last expression implicitly without using return
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<Burgestrand>
k200 Your recursive method will keep going forever until key != new_key (random), and eventually return new_key.
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<Burgestrand>
k200 If it helps, your method will behave the same if you have a return in both branches of the if-statement, if that helps.
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<Burgestrand>
k200 Hm, maybe I understand. Yes, it will return the value of change_api_key(key) to the main call.
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<k200>
Burgestrand: yes. thanks.
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<Garo__>
let's say I have an object. Is there some kind of special function (like there is [] and []= functions) which I could create so that my instance would be evaluated to false when I do "if instance" ?
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<tobiasvl>
Garo__: no :/
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<dminuoso1>
Garo__: Ruby has the following logic hardwired: Nil and false are false - *anything* else is true.
<Garo__>
I'm trying to make an object which contains a Hash. I have [] and []= set which modifies this hash, so that the object feels like hash. if I try to [] a symbol which doesn't exists, it will return a new instance, so that I can set nested objects easily: a = Node.new; a[:foo][:bar] = "foobar" will just work. I just want to handle a special case: "if a[:doesnotexists]" would not evaluate into true
<dminuoso1>
You can't change this without modifying Ruby itself.
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<dminuoso1>
Garo__: If you have the need for such semantics, provide a helper method that returns the boolean state you want.
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<djellemah>
>> ha = Hash.new{|hash,key| hash[key] = []}; ha[:new_key] << 1; ha #Garo__
<djellemah>
Yeah, that fills in all the missing pieces ;-)
<Garo__>
baweaver: thanks for the idea. the default_proc indeed solves this issue, but it can't be Marshalled - which was the reason why I stopped using that and started to write my own class :/
<Garo__>
sorry, should have said to you that I already tried that and I hit the marshall issue :(
<djellemah>
It's also pretty easy to put the default_proc machinery in a Hash subclass (alternatively Delegator), which will marshal as long as you have the class on both ends.
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<ocx>
hi all, can i consider a block of a function and the function definition to be in the same scope?
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<ocx>
what is the equiv to each do {x} ..
<ocx>
each do |x| ...
<ocx>
for each what?
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<ocx>
?
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<canton7>
ocx, it's not clear what your question is
<tobiasvl>
ocx: what do you mean here
<tobiasvl>
ocx: array.each do |x| do_something_with x end
<tobiasvl>
with a little ; in there
<tobiasvl>
ocx: is the same as array.each {|x| do_something_with x }
<tobiasvl>
and it does something with each x in array
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<ocx>
tobiasvl: i mean when the tatemenr start with each
<ocx>
not .each
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<tobiasvl>
do you have an example?
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<ocx>
class Array def hello each do |x| p x end end end [1,2,3].hello
<ocx>
guess each is like args.each?
<ocx>
shortcut
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<tobiasvl>
well, inside Array simply calling "each" will have self as the receiver
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<tobiasvl>
it's not a shortcut, it's just that when you call [1,2,3].each you will call Array's each method, and the same happens if you just call each inside Array
<constant>
manveru this is a ruby variable? I'm looking for something from the command line
<constant>
like "gem environment gemdir"
<constant>
but the local variant
<manveru>
ruby -e 'puts Gem.dir'
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<constant>
that gives me the non-local version :/
<constant>
/opt/local/lib/ruby2.3/gems/2.3.0
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<manveru>
that gives you the location that `gem install` tries to use
<constant>
how about gem install --user ?
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<constant>
erm --user-install
<manveru>
did you put that in your .gemrc?
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<constant>
no, I specify it on the command line
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<manveru>
well, there's always Gem.user_dir
<constant>
that's the one. Thanks!
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<ocx>
module Auxiliary def self.module_list <--- here module_list is a method?
<ocx>
why did we do self. and not def module_list
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<dminuoso_>
ocx: Do you want the technical explanation, or just the users perspective?
<ocx>
both
<dminuoso_>
ocx: In Ruby only classes can have methods (and modules for the purpose of this discussion are just classes)
<dminuoso_>
ocx: So when users talk about "instance methods" and "class methods", instance methods obviously belong to the class, but where do class methods go?
<ocx>
in modules
<dminuoso_>
No.
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<dminuoso_>
Ignore the word modules, there is no real difference between modules and classes.
<dminuoso_>
(Ruby just wont let you do somethings to either, but they are not really any different)
<ocx>
class methods in a class
<dminuoso_>
ocx: The key is, that a class is also an object.
<dminuoso_>
ocx: And every object has a singleton class attached to it, a special class that exists just for that single object.
<dminuoso_>
ocx: Class methods go to the class objects singleton class.
<ocx>
ok
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<dminuoso_>
ocx: now the reason this works with "def self.foobar" is as follows -> inside the block "self" refers to the class object itself.
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<dminuoso_>
And when you do "def object.method" its always defining a method on objects singleton class
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<veloutin>
Porfa: maybe you want to be doing dat_pneucity.at_css inside your each block
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<veloutin>
Porfa: or any other relevant method to access the content you want
<porfa>
what sort of other revelant method?
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<veloutin>
Porfa: well, I don't know what you have available in that loop, all I can see is that you are looping over something, but repeatedly calling the same method on the same object inside
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<dminuoso_>
manveru: Thanks, I knew I could rely on someone being arsed. :p
<manveru>
:P
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<manveru>
there must be a prettier way... but not with only one iteration
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<ccooke>
Technically any operator with three arguments is *a* ternary operator, but ?: is the only one that is actually common; almost all the languages since at least C forty-odd years ago have have it.
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<hexerrus>
Hi everyone )
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<manveru>
also interesting, there are also unary and binary operators :)
<manveru>
unary is like !foo, binary is like foo|bar
<dminuoso_>
manveru: Once you start looking at formal grammars, this becomes much more obvious too. :)
<manveru>
yeah, i first realized that when i wrote my own language
<dminuoso_>
manveru: The C grammar for example has a set of rules that can be reduces to "unary_expression" (which applies to stuff as ++i, sizeof(i), alignof(i) )
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<dminuoso_>
The last two examples are less obvious to the user.
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<manveru>
unary is basically any function that takes one argument, while in ruby methods have two arguments at least
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<matata>
Hi
<manveru>
so they're binary :)
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<manveru>
since you always pass the object you want to work on
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<manveru>
in python that's the 'self' you always get
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<manveru>
while in ruby it's implicit
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<manveru>
once i realized that, i was much more ready to move to functional languages
<djellemah>
matata: hakuna
<matata>
What's the best way to read first 2 lines from the STDIN ? I'm using STDIN.read but not really sure how I can read only few lines. The problem is that file is really big and I just want to check first 2-3 lines and exit.
<dminuoso_>
manveru: next up on my list is to learn Haskell
<dminuoso_>
manveru: You can use IO#readline (which is essentially just IO#gets)
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<manveru>
actually, print gets, since it has a newline already
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<manveru>
but yeah
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<chris2>
doesnt matter for puts
<manveru>
true that :)
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<dminuoso_>
matata: and that last lane regarding IO#readline was meant for you
<dminuoso_>
matata: Its probably a good thing if you get familiar with the entire IO class
<dminuoso_>
(It gives you a better understanding on how IO interaction in general works. The knowledge can be applied to other languages such as C too)
<apeiros>
chris2: the month length is irrelevant with that method. or do you see a case where it would matter?
<chris2>
no, i think you are right
<chris2>
should have come up with that myself :P
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<apeiros>
:D
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<guardian>
hello, it seems including a module and then undef foo to undefine method foo works, but is this the proper way to do it?
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<porfa>
help me im rusted, i lost my old works and can’t get this new one to work
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<havenwood>
porfa: ##rust is for rust-related discussion
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<porfa>
hahah
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<havenwood>
guardian: why do you want to undef a method from the included module?
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<havenwood>
guardian: buy yeah, undef is prim and proper
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<guardian>
because I only want a few from the module and I don't own the module
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<Mrgoose>
Do you all separate integration and unit tests into different folders?
<asahi>
I use rbenv, and when I call "ruby -v" in a directory that has a Gemfile in it, I get a different version from "rbenv local". The Gemfile doesn't specify a ruby version, so where is the ruby version being specified?
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<havenwood>
asahi: Is there a .ruby-version file?
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<cr3>
hi folks, might there be a way to use a cache on the filesystem with bundle install/update? I'm seeing ~/.bundle and ~/.gem populated but they don't seem to contain gems, so the next bundle install/update seems to download everything again.
<porfa>
the problem i guess, in the comand line it shows as space
<porfa>
but i guess it isn’t
<porfa>
its this “ “ inside the quotes.
<sagax>
hm, strange, i test this "245/65 17 ".gsub(/\s/, ",") and it work
<porfa>
it’s not a space, i did the gsub with physical pressed space, it didn’t work.. i copy pasted the space from the string, psted it the gsub and it worked...
<porfa>
it replaced hmm
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<eam>
you may have unprintable characters in your string
<porfa>
anyone used “COURSERA” ? thinking about enrroling in a ruby course