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<xall>
I'm messing around trying to convert a problem I solved in JS to ruby and I'm getting no method errors for all the lambdas I defined. What's wrong? https://dpaste.org/LASS
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<xall>
seems like something with lambda scope - i'm looking
<xall>
this was premature. ignore it for now
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<xall>
seems like the issue i'm having is referencing a lambda var from inside another lambda var's block
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<xall>
doh, the problem was just proc calling syntax: parens instead of bracket
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<rapha>
why does obj = [] ; puts "yup, it's an array" if obj.class == Array work, but case obj.class; when Array then puts "yup, it's an array"; end doesn't?
<rapha>
(hi all)
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<Bish>
can someone tell me what the last guy said that hightlighted me?
<Bish>
was it ytti ?
<Bish>
my backlog doesnt go as far
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<Bish>
brb
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<leftylink>
rapha: because `case obj.class; when Array` asks whether `Array === obj.class`, which it is not. The only reasonably close possibilities that are true is that `Array === obj` and `Class === obj.class`.
<leftylink>
because case uses ===, not ==, to determine whether to take a `when`.
<rapha>
leftylink: thank you for the explanation! So, practically, the sensible thing to do is `case obj.class.to_s` and `when 'Array' then`?
<rapha>
Oh, wait. That says "Of limited use for modules, but can be used in `case` statements to classify objects by class."
<leftylink>
I don't like that. I would prefer to `case obj; when Array`. but you should pick whatever fits your purposes, based on the knowledge of what === does.
<rapha>
Aaaaaaah, that simple!
<rapha>
Yay, that works perfectly and looks MUCH better :-D
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<Bish>
does this channel have a backlog somewhere?
<Bish>
oh, there in the topic
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<rapha>
hmm
<rapha>
if i *only* rescue NameError => e, all *other* exceptions should result in a crash, no?
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<rapha>
or perhaps better to ask: is there a way to check beforehand whether Object.const_get('Something', Class.new) would succeed?
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<rapha>
Oh, simply defined? will do :)
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<rapha>
Nevermind, it does take Kernel#const_defined?
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<mwlang_>
Is it possible to tell if an instance variable has been set before calling instance_variable_get ? Looking to fix a warning: warning: instance variable @foo not initialized
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<mwlang_>
of course I had to ask the world before I could find the answer myself: instance_variable_defined? was the answer.
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<al2o3-cr>
mwlang_: instance_variable_defined?
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<al2o3-cr>
oh, you found it.
<mwlang_>
yeah, I found it. I just couldn’t get my google fu on until I got some coffee and thought about it more. :-). I do wonder though…It’s Ruby 2.6 that’s emitting these not initalized warnings…does that mean Ruby 2.7 and beyond will one day be throwing errors and we need to fix our code? If so, I have some issues to open on two or three gems that my project is depending on.
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<AndroidKitKat>
Is this the official ruby channel? I normally would post a bug like this on the dev tracker (and probably still will), but under this page: https://www.ruby-lang.org/en/documentation/ , the "Ruby User's Guide" is a 404
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<bluvinyl2>
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<rubies4life>
what's the best way to create a string from the results of each iteration?
<rubies4life>
i could of course just append to a variable but that seems kinda crude
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<rubies4life>
never mind, i just refactored it into a function call
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<AndroidKitKat>
I have a quick question -- I'm trying to figure out why when i go to iterate through this array, i'm getting repeat variables, but when I just do 'puts perms' i don't see any repeats
<AndroidKitKat>
I think my main issue is with the class I'm expanding on from lines 3 to 13
<AndroidKitKat>
I know this code isn't elegant at all, but I'm currently learning
<AndroidKitKat>
ahh wait, nevermind, i found my issue
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<AndroidKitKat>
Is there an equivalent to an ordered dict from collections in Ruby?
<AndroidKitKat>
so you can add something to a hash, that defaults with the key 1,2,3,4, ... n, n +1
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<erikh>
do you really want an array?
<AndroidKitKat>
I want the instant lookup from a hash
<AndroidKitKat>
I have suuuuuper big arrays
<erikh>
check out mmap
<erikh>
array lookup and iteration should be faster than a hash
<erikh>
at the end of the day, that's just some really basic math. hash key management is much more complicated in comparison
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<AndroidKitKat>
I think the bigger problem is how i'm storing my data, to really access my data I have to have 4 nested loops
<erikh>
possibly
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<erikh>
why are you storing this at all?
<erikh>
ah nvm
<erikh>
I bet password cracking tools have some good algos for this
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<AndroidKitKat>
I'm finding all permutations of words, using String.permutation, for each length, so for example, the string ab would return a,b, ab, ba
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<AndroidKitKat>
I think I know the proper way to do this with a hash
<erikh>
you could use a set for this
<AndroidKitKat>
doh
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<erikh>
then the operations become fairly linear if you want to take a semi-brute force approach
<erikh>
this is all guesswork on my end fwiw
<erikh>
I wouldn't rely on it
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<AndroidKitKat>
yeah I think a set is the right strategy
<AndroidKitKat>
thanks
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<AndroidKitKat>
yeah, a set was exactly what i needed, as well as a change to how i generate permutations, thanks again erikh
<erikh>
\o/
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<AndroidKitKat>
really, really liking the way ruby does things
<AndroidKitKat>
it's a nice breath of fresh air after doing only python
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