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<nietzschette>
hey i have a quick question question
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<al2o3-cr>
harly: best time reading
<al2o3-cr>
?ask nietzschette
<ruboto>
nietzschette, Don't ask to ask. Just ask your question, and if anybody can help, they will likely try to do so.
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<jericon>
In my script I'm using mysql2 to retrieve a value from MySQL. It will always be a single row returned (I'm doing SELECT TO_DAYS(now());). What I want is to get the result of that query into its own variable. What is the best way to do that?
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<harly>
eam: missed your suggestion. I like that. to get it printed out as a decimal, is it best like (10.1r/100r).to_f or should I use something that doesn't involve a float?
<nietzschette>
I have a tk app and when I bind a command to a button, it appears I am limited to commands in the global scope. Is there a way to reslove the local scope in a string?
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<al2o3-cr>
?code nietzschette
<ruboto>
nietzschette, We can't help you without your code, please post it to https://gist.github.com
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<ericwood>
huh there's Tk ruby bindings?
<al2o3-cr>
ericwood: yep
<ericwood>
I used to do so much Tkinter stuff when I started out with python, it was kinda fun!
<ericwood>
oh boy oh boy
<eam>
harly: it depends on your use case -- the thing to keep in mind is that the number base dictates which operations can and can't be performed accurately
<eam>
harly: just like 1/3 is a repeating decimal in base 10, other values are repeating (and un-expressable without loss) in base 2
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<ericwood>
oh my god ActiveState TCL
<ericwood>
now there's a phrase I haven't heard in a while :o
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<al2o3-cr>
nietzschette: that semicolon should be a comma
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<al2o3-cr>
*them
<ericwood>
oh my god...it works
<nietzschette>
you see the ugly portion in the string i have to name my module, my class, and a member of my class before I even get to the funtion. is there a way to reference that function directly, or provide the scope programaticly?
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<harly>
eam: ok i get that. so if I have Rational(1.3) and I want that printed out as decimal with a precision of 3. what's the best approach? (reading through precision docs in Rational but i think that's not applicable)
<harly>
Rational(1,3) i mean.
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<nietzschette>
you mean, like Rational(1,3).to_f.round(3)
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<eam>
harly: probably use bigdecimal for that
<al2o3-cr>
nietzschette: interpolate the string
<harly>
nietzchette: yes i mean that. but i wonder if I should still avoid float and use something else.
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<eam>
to_f will have the same rounding issues as the original expression
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<eam>
Rational is nice if you want to represent the exact rational value
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<eam>
BigDecimal will give you more precision for actually doing the division
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<harly>
eam. in this case i'm happy to stay in rational until i just want to represent the final answer.
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<eam>
you can always BigDecimal.new(some_rational)
<harly>
eam. so just trying to fish for the best way to take the final rational, say Rationa(1,3) after all the calculations, and represeent it as a string "1.333". what .to_f.round(3) does.
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<harly>
0.333 of course.
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<eam>
>> BigDecimal.new(Rational(1,3), 3)
<ruboto>
eam # => uninitialized constant BigDecimal (NameError) ...check link for more (https://eval.in/463261)
<nietzschette>
ah yes, I remember those problems now.
<eam>
if you push your math into Rationals you know you won't encounter errors due to the rounding limits of the type -- and BigDecimal is the way to do the final high precision conversion
<harly>
although. in this case small final precision probably makes it all a bit moot
<ruboto>
havenwood # => /tmp/execpad-0034ce16b55f/source-0034ce16b55f:1:in `p': undefined method `inspect' for #<Object:0x41 ...check link for more (https://eval.in/463279)
<shevy>
now you did it
<shevy>
you broke the ruby
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<havenwood>
shevy: No worries:
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<havenwood>
>> class << self; remove_method :inspect end; self
<bnagy>
not sure if that counts as 'good' until I hear the question :)
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<eam>
I'll cross post from their sleepy channe:
<eam>
buf = Thing.read; struct = MyFFIStruct.new FFI::MemoryPointer.from_string buf # is this the best / most efficient way to perform what in C might be read(f, &my_struct, sizeof(my_struct)) ?
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<eam>
al2o3-cr: yeah I'm using that
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<eam>
Thing in this case is a usb handle
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<eam>
wondering specifically about a clean string/buf -> struct path
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<bnagy>
eam: pretty much, afaik
<eam>
ok rad
<eam>
it seems to be working well
<bnagy>
you can use FFI::Pointer or MemoryPointer
<eam>
what's the difference?
<bnagy>
but if you're starting with a string that's certainly what I'd do
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<bnagy>
FFI::Pointer comes from Other Stuff eg things return em
<eam>
aha
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<al2o3-cr>
whats a pointer
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<bnagy>
I guess you could avoid the intermediate buf variable, but I probably wouldn't :)
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<eam>
al2o3-cr: an integer that points to a location of memory
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<al2o3-cr>
eam: ah ok
<eam>
bnagy: makes sense :)
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<eam>
now I have a method that given a descriptor and a FFI::Struct class will read 'em off the wire
<eam>
seems to be working ok
<al2o3-cr>
int foo = 1; int_ptr = &foo; <-- ?
<eam>
yeah
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<eam>
and then *int_ptr = 5 # changes the memory location of foo, so foo == 5
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<al2o3-cr>
so whats the difference between `*` and `&`
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<eam>
& is address-of, * is points-to
<bnagy>
direction
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<al2o3-cr>
ah ok :)
<al2o3-cr>
whats the difference between struct and typedef?
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<eam>
al2o3-cr: a struct is an ordered layout of variables in memory with names, like a ruby class with no methods or a hash (but with a different layout)
<eam>
a typedef is essentially an alias
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<eam>
typedef int magic_number; magic_number foo; # foo is an int
<al2o3-cr>
eam: ok awesome
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<al2o3-cr>
c boats
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<al2o3-cr>
so eam this is valid char *foo[] = "ksjdkj";
<eam>
just char *foo = "ksjdkj";
<eam>
in C, a double quoted string is a pointer
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<eam>
in fact,this is valid C: "asdf"[2] or this: 2["asdf"] -- they're the same thing
<al2o3-cr>
eam: why though?
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<eam>
x[y] is just shorthand for *(x + y)
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<eam>
if you have char *foo = "abcd"; and "abcd" is at memory location 1000, then it means *(1001) is the byte 'b'
<eam>
which is foo[1], or 1000 + 1
<al2o3-cr>
eam: so a char is one byte?
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<eam>
generally (not sure if always on all platforms?)
<al2o3-cr>
should be upto 64bits
<eam>
a C char isn't a unicode character
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<eam>
C doesn't have a concept of character datatypes
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<eam>
wikipedia says POSIX guarantees char = 8 bits
<eam>
other platforms might differ
<al2o3-cr>
eam: kk
<eam>
most of the datatypes have a minimum size, but no max
<eam>
which is why stuff like int can grow to larger values on new architectures
<al2o3-cr>
but a double on 32bit is 4 64bit 8?
<al2o3-cr>
eam: have you tried overflowing the stack on 64bit arch?
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<eam>
floating point is unrelated to the integer size, or pointer size
<al2o3-cr>
eam: correct
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<al2o3-cr>
eam: you know assembly ia32/
<al2o3-cr>
eam: you know assembly ia32/64
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<al2o3-cr>
>> "bonfire lollies all around " * 9
<ruboto>
al2o3-cr # => "bonfire lollies all around bonfire lollies all around bonfire lollies all around bonfire lollies al ...check link for more (https://eval.in/463354)
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<al2o3-cr>
mallu: and what should be the return value?
<mallu>
[1,4,5]
<mallu>
my code is returning an empty array
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<al2o3-cr>
mallu: give me sec
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<Ropeney>
mallu, dont you want > 1?
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<Ropeney>
nvm didnt read above
<mallu>
Ropeney: Actually I wanted <= 1
<mallu>
thank you
<mallu>
that worked
<Ropeney>
:D
<mallu>
BTW if you care this would also work... just in case if you are curious def non_duplicated_values(values) values.find_all { |x| values.count(x) == 1 } end
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<al2o3-cr>
mallu: there's a totally better way than this but, you know
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<c0dedead>
I tried asking this in #rubyonrails but did not get a response. How do I combine an ActiveRecord_Relation and an ActiveRecord_AssociationRelation so that I end up with a single relation which holds all of data from both relations?
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<certainty>
moin
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<tomaz_b>
hi... i have one newbie question and would really appreciate some help. i need so solve something with ruby. can someone suggest/direct/show me link/tutorial/something that would show me how to sign XML programmably with certficate.
<tomaz_b>
i found some (quite old) gems.
<tomaz_b>
what would you use today?
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<adaedra>
Hello
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<shevy>
hey undeadra
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<musashi>
I'm not sure this is the best place for this but can I ask you guys how I would write a regex that would match with "o/" and not "\o/"
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<tobiasvl>
musashi: negative lookbehind
<musashi>
sorry?
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<tobiasvl>
musashi: you can use something called a "negative lookbehind" to achieve that
<canton7>
ruby-lang410, you're being caught out by too little escaping and too much interpolation
<izzol>
I have an API in sinatra, and I need to have a fast nice fronted to it. What is the best for this? :-)
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<canton7>
ruby-lang410, example... Test_String.scan(/...\....\....\..../) works fine
<canton7>
ruby-lang410, similarly, Regex_Pattern = '...\....\....\....' and Regex_Pattern = "...\\....\\....\\...." are fine
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<ruby-lang410>
canton7: Thank you verymuch ... I just changed " " to ' ' and it worked?? ... However I am still confused why :/
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<ruby-lang410>
canton7: Any suggestions on what to google to know more about this
<canton7>
ruby-lang410, within " ", \ acts as an escape character. so ruby sees "\.", and goes "ok, he's escaping a period - but that's not an escape sequence, so I'll just insert a period"
<canton7>
... so you lose the backslash before you get near the #scan method call
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<canton7>
within ' ' there is no escaping, so this doesn't happen. likewise "\\." means ruby goes "ok, he's escaping.. a backslash. which results in a backslash. next, there's a period..."
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<ruby-lang410>
canton7: OMG ... this so valuable knowledge!! ... Thank you so much !! ... May god bless you :)
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<newbsduser>
hello, i want to generate raw http packets with ethernet header.. i want to inject these packets specific interface. for instance: eth3. how can i do that with ruby? if u advise me a tutorial or library name i ll be glad
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<rob_>
newbsduser: look at socket library
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<yorickpeterse>
Socket doesn't let you inject packets into any interfaces
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<shevy>
it sounds non-trivial what newbsduser wants to do
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<adaedra>
that's low level (and requires root under Linux, afaik)
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<Moblin>
Is there a ruby method that inherently puts a number to a string with commas?
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<apeiros>
Ebok: asking a question and then changing nick ain't smart.
<Ebok>
Fair
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<Ebok>
I only noticed it was the backup nick after asking
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<apeiros>
I don't really know what you're asking for either, though :)
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<shevy>
363665.localize # => "363,665"
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<Ebok>
Hm
<Ebok>
Cool!
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<apeiros>
updated to include `places` arg: -1234.56.localize(thousands: "'", decimal: ",", places: 4) # => "-1'234,5600"
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<apeiros>
better naming of arguments welcome :)
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<Ebok>
that regex ... take the first number, looking forward at three numbers, and put a "," there. I like it ^^
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<apeiros>
that one's actually stolen. iirc from zenspider
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<Ebok>
Im mostly happy to be able to read that regex tbh. I'm just starting to come to terms with lookforward lookback
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<apeiros>
lookaround is the umbrella term ;-)
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<Ebok>
noted
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<mikecmpb_>
if i have a module with some behaviour, is there a good pattern for being able to overwrite some default values that the module uses from the class which includes it?
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<mikecmpb_>
i've extracted some password reset code out into a module and i want to have a default password expiry but allow that to be changed by the class which includes the module, not sure what approach to take.
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<apeiros>
mikecmpb_: define them as methods
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<apeiros>
including class can then just define those methods itself
<jhass>
constant resolution should win as well
<mikecmpbll>
ah yes.
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<apeiros>
I usually prefer methods as they allow logic too. but granted, not always actually.
<mikecmpbll>
jhass: how could that work?
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<jhass>
>> module Foo; X = 1; def x; X; end; end; class A; X = 2; include Foo; end; class B; include Foo; end; [A.new.x, B.new.x]
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<jhass>
weird, I thought the first case works
<apeiros>
>> module Adder; def value; base + summand; end; def base; 0; end; def summand: 10; end; end; class FutureYear; include Adder; def base; Time.now.year; end; end; FutureYear.new.value
<ruboto>
apeiros # => /tmp/execpad-dbeb92f3a286/source-dbeb92f3a286:2: syntax error, unexpected ':', expecting ';' or '\n' ...check link for more (https://eval.in/463713)
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<apeiros>
plerp
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<apeiros>
with constant you need self::
<apeiros>
or self.class::
<apeiros>
>> module Adder; def value; base + summand; end; def base; 0; end; def summand; 10; end; end; class FutureYear; include Adder; def base; Time.now.year; end; end; FutureYear.new.value
<apeiros>
meh, /me late. jhass already corrected himself :)
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<mikecmpbll>
apeiros, jhass: excellent, thank you both!
<mikecmpbll>
i thought i'd get some redefining constant error if i did that, for some reason.
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<jhass>
nah, those are really two separate constants in their own namespaces
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<jhass>
it's just resolution that makes it work, A::X winning over Foo::X
<mikecmpbll>
gotcha
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<Ebok>
aperios: actually, while I can read it, I'm not entirely certain of the implications of this part of that gsub regex: +$, does that actually make the regex start from right to left? "+ end of line"
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<jhass>
Ebok: + is a quantifier, it affects the expression before it, not after
<jhass>
.+ is any character (.), one or more times (+)
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<jhass>
ah okay, shold've looked at the context
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<jhass>
Ebok: in this case we already have the quantifier, {3}
<jhass>
that's three times
<jhass>
\d is any number, so three digits
<apeiros>
\d{3}+ is shorthand for (?:\d{3})+, so a multiple of 3
<Ebok>
I see. so its {3}+ together
<apeiros>
+digits
<Ebok>
Right
<jhass>
wait, it's not the no backtrace thing, what was it called again?
<Ebok>
I guess I just need to look up and read more about how 'end of line" functions
<apeiros>
jhass: greediness?
<jhass>
yeah, no
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<jhass>
possessive
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<apeiros>
yeah, * is possessive, ? is lazy (iirc)
<Ebok>
possessive sounds familiar
<jhass>
non-greedy still backtraces
<apeiros>
ah, *+ is possessive
<jhass>
apeiros: it's a lookahead, so I have my doubts about your interpretation
<jhass>
can't have dynamic width things there
<apeiros>
yes, I think {m} is a special case
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<apeiros>
in other cases you'd have to write the (?:) out iirc
<apeiros>
as said, that part is stolen :D
<jhass>
{m} is a fixed width, yeah
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<jhass>
but "\d{3}+ is shorthand for (?:\d{3})+" would make it dynamic width
<jhass>
I think it's possessive rather, no?
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<apeiros>
was there a diff between atomic group and possessive quant?
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<jhass>
atomic group is the superset, possessive quantifiers are shorthands to certain variants
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<apeiros>
if it was just possessive, it wouldn't work as far as I understand. because it'd match the quantified pattern only once. i.e. {3} is the quantifier then. + is only modifying that to be possessive.
<jhass>
"You can make a quantifier possessive by placing an extra + after it. * is greedy, *? is lazy, and *+ is possessive. ++, ?+ and {n,m}+ are all possessive as well."
<Ebok>
Basically the reason I asked was I was just looking at /(\d)(?=\d{3}+$)/ on Rubular, and noticed that it grabbed 45 0 00 0 000, in 450million. the last instance of 0 puts the comma after it, but then its only two 0 before the next injection, unless the comma counted. So I wasnt clear what was actually happening
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<Ebok>
Going from right to left in this instance would be a cool trick >_>; if that was actaully happening
<Ebok>
I mean I know the method is returning the values correctly
<Ebok>
I suspect reading that tutorial will provide me some of the answers
<apeiros>
jhass: yeah, that'd be really nice
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<adaedra>
I had a site like that
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<_blizzy_>
some guy was arguing that ruby is unreadable. Im like how?
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<_blizzy_>
it's one of the most readable languages I know of.
<apeiros>
they've got some pretty unreadable ruby code to share :D
<_blizzy_>
oh.
<apeiros>
you can write unreadable code in almost any language
<apeiros>
but yeah, IMO wrt common code readability, ruby is one of the most readable languages out there.
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<jhass>
it does take a bit to get used to, but then it's very readable
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<jhass>
I do remember my first impression of it being confusing too
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<jhass>
adaedra: doesn't like our case unfortunately
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<jhass>
apeiros: I think it's a special case in oniguruma, similar to what Java does, expanding (?=\d{3}+$) to (?=\d{9}$|\d{6}$|\d{3}$) automatically, starting with 3**n <= remaining string length
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<jhass>
and then iterating n down to 1
<apeiros>
that's actually a pretty nice performance optimization
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<jhass>
at least that's the only way I'm able to explain that expressions behavior to me
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<apeiros>
I think {3} is not a quantifier in the classical sense
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<apeiros>
in that it is fixed
<apeiros>
i.e. \d{3} is really just (?:\d\d\d)
<jhass>
mh, no, it's \d{,m} actually
<apeiros>
no
<jhass>
well, m,m
<apeiros>
\d{,m} is \d{0,m}
<jhass>
yeah derped there for a sec, I meant {m,m}
<apeiros>
and \d{3} is \d{3,3}, which is (?:\d\d\d)
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<jhass>
but your expansion would be an optimization over the general case
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<apeiros>
hence I think \d{3}[+*?] is unrelated to greedy/possessive/lazy. \d{3}? would be "3 or none"
<apeiros>
and not "lazily 3"
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<apeiros>
same with \d{3}*, it'd be "a multiple of 3, with factor starting at 0"
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<jhass>
the Java behavior for \d{n,m}+ is take the max (m) and generate alternations of \d{m**i} with max(m**i) <= remaining string length
<apeiros>
I'd bet that's also only true for n != m
<jhass>
according to regular-expressions.info
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<jhass>
and it's only doing that inside lookarounds, outside it's possessive
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<jhass>
but lookarounds are already atomic
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<adaedra>
jhass: yeah, it would be even cooloer with a Ruby mode.
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<apeiros>
minver: you can create custom error classes and you can write custom rescue blocks
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<apeiros>
and ruby doesn't care what you put in the message string even with the core exception classes
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<apeiros>
as for custom error classes: just inherit from StandardError (NOT from Exception!)
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<minver>
apeiros: Even if I have a custom error and override the message method raise() still seems to skip formatting. I want newlines and tabs in the error message
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<minver>
apeiros: nvm, thanks!
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<jmonreal>
hey there folks. I am using optparse to parse the arguments of command line, but when I do not enter anything, the script does not show the help
<jmonreal>
I was wondering what am I missing
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<Ebok>
how do you ask a regex to look ahead for two conditions?
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<Ebok>
example find any letter followed by 'a' and 'b'
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<Ebok>
assume a and b could be anything
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<Ebok>
the search considition in this case is /[A-Z](?=[0-9])/ >_>
<havenwood>
Ebok: Any two digits followed by a capital letter, or a known list of options or?
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<gregf_>
Ebok: if whats following A and B are dynamic, then God help you :|
<Ebok>
gregf gave me what I needed
<Ebok>
And yeah I know
<Ebok>
xD
<gregf_>
Ebok: that was just a guess, havenwood has asked quite a valid question ;)
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<jmonreal>
great!
<jmonreal>
do you folks know how to tell optparse to validate the required fields?
<Ebok>
havenwood, I dont have a specific need outside needing to be able to look ahead for multiple conditions, say, take X when its followed by anyY and Z
<Ebok>
The answer was literally +
<Ebok>
>_>;
<Ebok>
\d(?=[a-zA-Z]+\d) <== an example. match a number thats followed by letters and one more number
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<Ebok>
I'll be more clear when I ask questions in the future, sorry for the headache, thanks for the assist
<Ebok>
I know there are other ways to do this, I'm just wondering if gsub can do it
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<Ebok>
the other curiousity I have with gsub is when the pattern is matched, can we modify the pattern? example "hello world".gub(/[aeiou]/,pat.next) turning e into f, o into p, etc
<slash_nick>
woods: that's on googles list of things to read before an interview
<woods>
Why do suppose I am reading it? :)
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<slash_nick>
woods: good luck! :)
<woods>
slash_nick, thanks!
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<woods>
I feel like I didn't grasp many of those concepts as well as I should have in school, so now that I have more time, I'm going back and reviewing.
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<slash_nick>
woods: are you also reading programming pearls & the one on programming interviews as well?
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<woods>
slash_nick, I don't have programming pearls, but a co-worker let me borrow "Cracking the Coding Interview"
<tylerm>
howdy - i'm looking at allinoneruby and tar2rubyscript but not having much luck and these seem like old projects.. is there a newer approach you can recommend
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<tylerm>
i want to deploy my app and complete ruby env to another linux machine with them needing to install anything.
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<tomaz_b>
hi... i am newbie in ruby ... i have to create XML, based on .xsd files. I came across soap4r and cmd tool xsd2ruby.rb. Now I got huge file full of classes and everything. But somehow ... I am not sure that I know how to build XML (actualy create one)... after instantiating some of those classes
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<tomaz_b>
can someone please help/suggest me how to proceed
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<Sou|cutter>
TheNet: I might take a look at ActiveSupport's class_attribute
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<apeiros>
TheNet: class ivar. you can initialize it in self.inherited.
<apeiros>
my pattern is usually to have a private self.initialize_class and call that via send from self.inherited.
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<apeiros>
I dislike ||= in accessors
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<woods>
slash_nick, sorry for the delayed response, i was out of the office, ill have to check that one out as well
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<Ox0dea>
So, you can include "Rakefile" in a gem's extension list to have your default Rake task executed post-install; this is pretty awesome, but RubyGems is mucking about with the output streams, so printing is annoying. :<
<Ox0dea>
https://eval.in/463874 only prints "--0--", indicating that I apparently have to repurpose stdin for output, and I don't wanna do that.
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<Ox0dea>
Please adivse.
<Ox0dea>
*advise
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<edj_>
it says i need to make this "books.sort { |firstBook, secondBook| firstBook <=> secondBook }" sort them in decending order
<Ox0dea>
edj_: Do you understand the <=> operator?
<edj_>
is there a way to do that without making it an if else?
<edj_>
no i do not
<Ox0dea>
edj_: Yes, it's extremely easy.
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<Ox0dea>
&ri Comparable#<=> @ edj_
<`derpy>
No results
<Ox0dea>
Derp.
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<Ox0dea>
edj_: Anyway, it's searchable name is the "spaceship" operator; look into it.
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<edj_>
Ox0dea:thanks
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<CalydOn>
Hello, I'm writing a Ruby code and I have some trouble with user input . When I use gets.chomp command I can't move the cursor backward terminal (with the left arrow key) , the terminal print [ [C ^ . I wonder if someone Could help me . Thanks
<Ox0dea>
>> [1, 2, 3].sort { |a, b| b <=> a } # edj_
<Ox0dea>
havenwood: None that come to mind, and I've thought about it hard-ish.
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<shevy>
slash_nick lol
<shevy>
"rename tailing to trailing"
<slash_nick>
:)
<shevy>
is this a pun or something
<slash_nick>
substantive, i know
<shevy>
"put the cat on the mat"
<shevy>
"take the dog out of the fog"
<shevy>
aaaah ok
<shevy>
typo fix
<slash_nick>
i thought i posted this in offtopic
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<slash_nick>
i'm lost.
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<shevy>
CalydOn what did you do just now, your nick appears wrong
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<CalydOn>
nothing i just use notice command
<shevy>
ok
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<shevy>
that scared the squirrel out of me
<Ox0dea>
CalydOn: You shouldn't.
<shevy>
CalydOn readline support is available from the official ruby tarball such as ftp://ftp.ruby-lang.org/pub/ruby/ruby-2.2.3.tar.xz - it is in that directory in ext/readline/
<shevy>
if you compiled from source, the makefile will try to see if you have readline + ncurses available, then the bindings will be compiled; distributions may have a readline package so you could try to use that
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<CalydOn>
why i shouldn't (i m new on irc, I made an mistake ?)
<Ox0dea>
CalydOn: Sorry, I've inadvertently led you on a goose chase. Your Ruby was almost certainly compiled with readline, you just have to explicitly request it as shevy is explaining.
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<shevy>
it depends how you obtained your ruby... perhaps you are on windows... not sure if they have readline support available by default, I assume no
<shevy>
*depends on
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<tsunamie>
however I am trying to understand the difference between Mechanize and Nokogiri
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<tsunamie>
how do I find out? IS there like a javadocs eqiviliant?
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<Ox0dea>
tsunamie: Parsing XML and driving a browser are very different things.
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<tsunamie>
sp Mechanize is for parsing XML? As I can see from nokriki I am taking in HTML as a massive string and this gem seems to have the ability to parse over it
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<tsunamie>
I get it's looping throught rows. and that it looping throught rows. How ever I am currently assuming that rows is a string
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<tsunamie>
and that each value is having css selector run throught them all. However I am getting stuck on the row.css("td a").map{ |a|
<tsunamie>
a['href'] if a['href'].match("/wiki/")
<tsunamie>
}.compact.uniq
<tsunamie>
section
<tsunamie>
manveru, I am trying to understand lines 2-4
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<manveru>
well, what don't you understand about it?
<manveru>
what map is? what 'td a' selects? what an href is?
<tsunamie>
manveru, I think a better question is. IS there an eqiviliant to javadoc's for ruby. Where I can lookup methodes roles, actions and so on for specific objects?
<tsunamie>
manveru, I think teaching me how to fish is the best way to go
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<manveru>
ruby-doc usually
<Ox0dea>
tsunamie: In your defense, that code isn't great.
<ruby-lang498>
im trying to open a txt file, pass all data into a new array and then match the array value with hash keys and im having some trouble...
<tsunamie>
manveru, Ox0dea do you know how the logic for this works? row.css("td a").map?
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<tsunamie>
so I get that row is an Nokogiri::HTML object
<tsunamie>
and that css is simply a method of that object that allows your the parse for items with that identification in the xml
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<Ox0dea>
tsunamie: Just so; #map is just a method on Enumerable that transforms the collection however you specify in the body of the block.
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<tsunamie>
however I don't understand where they got the map method from as I can't see it in the nologiri documents. So I assuming it's the method thats apart of an array
<Ox0dea>
tsunamie: #map is a core method provided by the Enumerable module.
<ruby-lang498>
manveru, why is it attaching a "/n" too the strings it add?
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<tsunamie>
Ox0dea, so how do I know what objects I can run each on? As I understand it Nokogiri is it's own object right? Which is a gem that structures the HTML into a searchable object
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<tsunamie>
so how did it know each method could be used on it?
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<tsunamie>
or how do I know what methodes can be run on a Nokogiri object? Since each is not in the docs for it
<ericwood>
tsunamie: don't node lists include enumerable? if so you can use any method in the enumerable module (in the ruby docs)
<tsunamie>
Ox0dea, I feel like I am missing something. A fundermental understanding. Like how actaully nokogiri is just a set of arrays/hashs
<apeiros>
tsunamie: don't forget the ancestry
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<apeiros>
classes inherit from other classes and include modules.
<dave1984>
I'm trying to create a collection so I can group my "projects". I made a folder called _projects/, added the collection and output: true in my _config.yml, and tried looping through it with {% for project in site.projects %} <h1>{{ project.title }}</h1> {% endfor %}. But it's not finding anything. Did I miss a step?
<Ox0dea>
Simply by defining your own #each (which should yield all your thing's elements in turn) and including Enumerable, you get >50 methods "for free".
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<tsunamie>
apeiros, so you saying if I run {}.method(:find).owner where inside the {} is the method it will show me the original owner
<apeiros>
dave1984: you missed the step of telling us what the heck you're talking about
<dave1984>
apeiros: lol my bad, did I ever
<dave1984>
jekyll, though I found a irc chan for it
<zenspider_>
Ox0dea: welcome to math?
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<Ox0dea>
zenspider_: Cicadas.
<tsunamie>
okay trying to absorb all of this, please be gental
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<zenspider_>
dave1984: I think that exact code would work fine in zenweb :)
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<apeiros>
beware, the spider lures in the zenweb
<zenspider_>
Ox0dea: that's nice
<dave1984>
zenspider_: are you plugging something? I have no idea what that is
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<apeiros>
oh, lurk, not lure
<tsunamie>
okay does anyone know how I can run this on a command line?
<tsunamie>
Array.instance_method(:map).owner
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<zenspider_>
tsunamie: either `ruby -e 'code'` or fire up irb and do it in there
<Ox0dea>
zenspider_: "Mind of a Hacker" was a nice listen, but 1 is composite, so you're a bad cicada.
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<Ox0dea>
s/composite/not prime/
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<lacrymol1gy>
I've got a list with hashes, and I want to map it into a list of a certain field: [{foo: 1, bar: 2}, {foo: 3, bar: 4}].pluck(:foo) => [1, 3]
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<lacrymol1gy>
is there an idiom for this?
<zenspider_>
again: that's nice.
<tsunamie>
zenspider_, irb? I have cygwin and I just ran ruby -e "Array.instance_method(:map).owner"
<tsunamie>
and it gave me nothing back
<zenspider_>
tsunamie: you didn't ask it to print anytihng
<zenspider_>
puts or p in front
<zenspider_>
irb should work for you
<zenspider_>
if it doesn't, something is wrong
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<tsunamie>
okay I think I am going to far for tonight
<tsunamie>
my brain is about to explode
<zenspider_>
lacrymol1gy: we wouldn't have a method on array specific to accessing sub-hashes. Instead, use #map: hashes.map { |h| h[:key] }
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<netule>
tsunamie, .css is a method that allows you to use CSS selectors to search for elements
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<tsunamie>
netule, Hi, I get that sorry. What I am trying to give myself is the tools to find that info
<tsunamie>
in some meaning full way
<Ox0dea>
tsunamie: Codecademy never shows you #map?
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<tsunamie>
Ox0dea, it gave me examples of map and how to use it. However that was never my problem. My problem was or the limited stuff that course covered are the absolut basics
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<tsunamie>
it instantiated that each object has it's own set of methodes unique to processing the object itself
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<tsunamie>
It never talked about how to read docs or search for which methods were avaiable to an object or how to check hieachy
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<tsunamie>
it just assumed you knew all the methodes avaiable to manipulating something. IT never gavce me the fishing rod and said. by the way. Here's how you work out which methodes can be used on the object you just created
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<tsunamie>
every single example just walked throught like this. Here is a string, ow you can use CAPUP bla bla bla all these methdos
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<tsunamie>
sorry ranted a bit
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<netule>
that's what references are for, though. You can hardly expect them to teach you all of the interfaces for all of the classes in Ruby
<Ox0dea>
netule: Codecademy is not a "reference"; it advertises that it teaches the student how to use Ruby.