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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<hfp>
A new question for you tonight: Could someone explain why in this pastebin http://pastebin.com/2e6quMbB the assignation to the hash I am doing in the loop is valid but the one below isn't? I understand I should add quotes to the 'test' iteration but I don't understand why it's not needed with the each method. Thanks!
<hfp>
'test' assignation* not iteration
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<havenwood>
hfp: `test` isn't defined but a key is expected
<havenwood>
hfp: `:test` the symbol or `'test'` the string would work, or if you assigned the bareword `test` to something
<havenwood>
hfp: a local variable or method could set test, for example
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<hfp>
havenwood: what I don't get is why it shouldn't be freq[`w`] += 1 rather than freq[w] += 1 for this to work
<hfp>
I have to say I'm new to Ruby and come from PHP
<hfp>
in PHP freq[$w] would not be the same as freq"$w"]
<havenwood>
hfp: inside the block the value of the current iteration is set to `w`
<hfp>
Yes I meant single quotes but they don't show well on IRC so I put `
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<havenwood>
hfp: ah, inside a quote is a string
<hfp>
Sorry I'm not being very clear... Do you understand what I mean or should I be clearer?
<havenwood>
hfp: Clearer, i'm afraid. The local variable inside the block `w` is set to the string value of each iteration as it happens.
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<havenwood>
hfp: like on the first iteration, `w == 'Some'`
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<hfp>
Ok. In PHP, consider this: freq = array(); w = "strin g"; print $freq[$w]; it would fail because it should be $freq["$w"] otherwise it messes up when the parser substitutes the variables.
<hfp>
What I don't understand in that Ruby snippet is why it works with freq[w] and doesn't need to be freq["w"] since freq[key] doesn't work but freq["key"] does.
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<hfp>
I guess not having a sigil in front of variables is also confusing fo rme in Ruby...
<havenwood>
hfp: w is being set in the block, it is in fact on each iteration a different String
<havenwood>
hfp: you'll get used to barewords in Ruby, it isn't hard once you get accustomed to it
<havenwood>
hfp: they are local variables or methods
<hfp>
I think I'm starting to get it. It works because w = "string" from the iteration, right?
<hfp>
And as such, Ruby recognizes the w object is a string so it doesn't need the quotes because it isn't substitution as it can be in PHP, correct?
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<jrobeson>
how would that break in php?
<jrobeson>
as long as such a key existed that is
<jrobeson>
i've never done $freq["$w"] in all my years of php coding
<jrobeson>
ever
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<jrobeson>
it's always freq[$w]
<hfp>
Ok then, I confused myself... I know where the door is...
<jrobeson>
do you mean because of that unicode character?
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<havenwood>
hfp: i don't know php well enough to weigh in, but seems you're on the right track!
<jrobeson>
hfp, for the most part (except for regex) you can pretend that $foo in php is the same as foo in ruby
<hfp>
No, I was thinking that w = string; freq[$w] would give freq[string] when it should have been freq["string"] to be correct.
<jrobeson>
in php and ruby you'd need to quote the string if it isn't a variable.. that's what i'm not sure
<hfp>
I think I got it, I just am very bad at phrasing my ideas tonight...
<jrobeson>
hfp, it'd be better if you put this in a gist or pastie or something .. give yourself a chance to write it out correctly
<hfp>
jrobeson: Ok
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<hfp>
jrobeson: Nevermind, my question didn't make sense I answered it with a bit of experimenting.
<imperator>
did ruby 2.0 end up adding any DBC stuff? i don't remember
* hfp
goes to hide.
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<jrobeson>
hfp, i'm sure you'll be be back again
<havenwood>
hfp: Nothing wrong with learning! :)
<jrobeson>
just play around some more, it'll all become clear
<jrobeson>
if it doesn't havenwood will be here for you :)
<hfp>
:) Thanks
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* imperator
confused hfp with hfb for a second there ;)
<hfp>
My confusion is spreading
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<dkam>
Hi everyone. Just installed Xcode 5 and found that gcc-4.2 points to the no-longer-distributed-with-xcode llvm-gcc-4.2. Installing gems now failed with "make: gcc-4.2: No such file or directory". Any ideas on how to fix this?
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<chobbit>
I need some help with regex. I want to .gsub %arg-[any number]%. I have the [any number] part, but I don't know how to add the strings to the sides
<chobbit>
nvm, got it in #ruby
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<julian___>
So what's so bad about using the eval method?
<julian___>
I mean, security risk, inefficent, what is it?
<MrZYX>
not sure about the performance on ruby, but definitely slower. The main concern is indeed security. And in ruby I'd call it a code smell, there's almost always an alternative way
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<julian___>
MrZYX: okay...how would you suggest creating a varible programatically without using the eval method?
<MrZYX>
a local or an instance variable? In most cases you want to use a hash instead
<Kero>
eval makes code harder to understand: refactoring and navigation (where is that method defined?) tend to fail.
<julian___>
That code won't run, but it shows you where I'm using it
<julian___>
Still don't really understand how a hash would work here :)
<MrZYX>
well, you already use instance_variable_set. There's instance_variable_get
<julian___>
ahh
<julian___>
awesome
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<davispuh>
I've never had need to use eval in Ruby
<Kero>
window = Window.new(...); window.attron(etc), etc, and only once instance_variable_set
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<julian__2>
Is using too many instance variables bad?
<julian__2>
should I use variables where possible?
<julian__2>
Is this better for memory?
<julian__2>
finally, then is there a 'variable_set' method as opposed to 'instance_variable_set'? I can't seem to find one..
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<r0bgleeson>
julian__2: yeah, too many instance variables is usually bad, it has nothing to do with memory though. whether or not an instance variable stays in scope depends on the thing that references the object. local variables go out of scope when the method does, but instance/local variable is usually a choice on how persistent you want the variable to be
<r0bgleeson>
there is no variable_set.
<r0bgleeson>
and "out of scope local variables" is kind of different with if a proc is around.
<r0bgleeson>
-with
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<MrZYX>
julian__2: if you feel the need to do something like variable_set "foo#{bar}", x / variable_get "foo#{bar}" do foo = {}; foo[bar] = x; / foo[bar] instead
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<julian__2>
r0bgleeson: Oh I see. Variable are just easier to manage. Instance variables could create some weird bugs maybe :) Can I set variables programatically, then?
<workmad3>
although, as the first result showed, it starts with an enumerator that does lazy evaluation :)
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<ichilton>
If it've got an array of hashes - each hash contains an array of hashes - what's the neatest way of getting an array of all of those sub-hashes?
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<ichilton>
that's a bit vague - here's an example:
<ichilton>
MrZYX: it was the flatten bit I couldn't quite get!
<MrZYX>
depending on what you do with them, there's also stuff like .flat_map
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<dorei>
flat_map ?
<ichilton>
how would you do it with that?
<dorei>
oh, flat_map is flatten and map combined in one method :)
<MrZYX>
I mean what you plan to do with the result, for example to get all record ids: .map {|hsh| hsh[:records] }.flat_map {|record| record[:rec_id] }
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<ErwinNH>
Newbie question: Why do I have to call a class with a .new operator? I don't understand what the .new does.
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<Barrin6>
ErwinNH,
<Barrin6>
that's how classes work
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<Barrin6>
hard to explain
<Barrin6>
since I"m a noobie too
<ErwinNH>
So just remember that when you want to reference a class, add .new to the end of your call?
<toretore>
new creates an instance of the class
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<Barrin6>
i thoughtyou only use .new to create a new class
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<toretore>
User.new #=> aUser
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<ErwinNH>
Hmm, ok. Thanks. I'm still a little fuzzy on why that's important but I suspect its because I don't fully understand the distinctions of scope.
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<jrobeson>
ErwinNH, coded in any other language before?
<ErwinNH>
Nope
<ErwinNH>
HTML and CSS plus cut and paste javascript ;)
<jrobeson>
aha
<jrobeson>
generically speaking.. new means.. give me a new instance of this object
<toretore>
ErwinNH: a class is a template for creating objects. when you say `User.new` you create a new user object from the template `User`
<jrobeson>
template is a good way to put it
<ErwinNH>
Ok, so in this example I have a database class that checks the file, makes sure it exists, makes sure its writable, and then writes to it. My interface file needs to create a new instance of this database class in order to perform those functions again?
<jrobeson>
database classes aren't really the best places to start
<jrobeson>
a bit beyond your paygrade atm if you don't know new
<jrobeson>
ErwinNH, you should consider tryruby.org and then the ruby koans
<Barrin6>
nice explanation there
<ErwinNH>
lol i'm sure you're right
<Barrin6>
or play on codeacademy
<jrobeson>
come back to actually writing your own code after that
<ErwinNH>
but I have it working so far
<ErwinNH>
I have a Lynda.com subscrip
<jrobeson>
but then you'll be asking questions every minute
<jrobeson>
better to get some of the basics handled first
<Barrin6>
code academy for basics, then try "learning ruby the hard way"
<jrobeson>
the ruby koans are nice in that you can play as much as you want.. but in your own editor
<Barrin6>
then project euler
<jrobeson>
Barrin6, the ruby koans are good enough.. since you don't have to deal with the browser all the time
<jrobeson>
just download and run it. break it.. see what a real ruby does when you break it
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<Barrin6>
I never tried ruby koans
<ErwinNH>
Hmm ok, i'll check that out
<Barrin6>
it's that good?
<jrobeson>
well it might be below your skill level now perhaps Barrin6 .. not sure
<Barrin6>
well I'm not that smart at ruby yet, I just pretend
<jrobeson>
it's just a really nice setup to play with.. a directory with all the exampel ruby files.. and it acts like a test
<Barrin6>
ruby is my first language
<jrobeson>
so.. it tells you what you made work since the last time
<Barrin6>
and I only been studying for a month?
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<julian__2>
is a class method a method that's inside a class?
<julian__2>
class Object def my_method puts "aright" end end
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<julian__2>
would 'my_method' be a class method?
<toretore>
no
<toretore>
def self.my_method would
<julian__2>
okay
<julian__2>
that makes sense
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<julian__2>
the only way I can get variables into thses methods is by making them instance instance methods
<julian__2>
@@var = "foo"
<toretore>
depends
<julian__2>
what's the best way to get variables into these class methods?
<toretore>
depends on what you mean by that
<toretore>
it's not usually something you should be doing
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<julian__2>
fair point.
<julian__2>
what's wrong with using @@ variables, then?
<Barrin6>
man ruby koans is confusing
<Barrin6>
okay so I downloaded this bad boy
<Barrin6>
edited the first file
<toretore>
julian__2: it would help if you provided the code to see what you're trying to achieve
<toretore>
@@vars are not used much
<toretore>
there's just not much need for them
<julian__2>
no, that's why I'm worried..i'll make an example
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<julian__2>
It won't run, but it illustrates what I'm trying to do
<julian__2>
literally get one variable inside blank_window
<julian__2>
I don't want to pass it in as a parameter, because it's a variable that never changes during the operation of the program
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<toretore>
what's the purpose of this code?
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<Barrin6>
lianj, i added the to_a
<Barrin6>
hmm
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<julian__2>
Basically, I'm using Curses to create a commandline GUI. To wipe a window from the screen, you need to work out its area and fill it with the same color as your background to blank it out. Information only leaves the screen if it's overwritten
<julian__2>
that's what the fill_all method does
<julian__2>
the fill_all method takes one argument, @@color_pair
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<julian__2>
@@color_pair is the background color
<julian__2>
it's used in other parts of the program
<toretore>
can't you get the bg color from the window instance?
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<julian__2>
what do you mean, pass it in as a parameter?
<toretore>
but anyway, you're defining the method in object, which is a no-no. you could define it in Window, but it's better to subclass to make your own class which has this capability
<toretore>
julian__2: no, the Window class.. does it not have something like a bgcolor attribute?
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<julian__2>
toretor: I'll admit I'm slightly confused by the Curses library. Window.new is part of the curses library. And no, each window doesn't appear to have these attributes. I have to add them like this: