* jordila
gonna use ^^ for ' $ rvm cleanup all' ...
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<mitch000001>
Hey, I just found something in a Ruby program I have never seen before. There was the use of `?` followed by a character. When looking into the source code of Ruby (parse.y) I found the function `static int parse_qmark(struct parser_params *parser, int space_seen)`. From how I understand it it is some sort of character escaping to parse a charcter without quotes within a Ruby source file. Does someone have any additional information about it
<mitch000001>
some documentation of the mentioned syntax elements? I could not find anything within ruby docs.
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<nortega>
Greetings, I wanted to ask about an issue I've been running into. When trying to install a new version of the `erubis' gem I get an error: `/usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require': cannot load such file -- ubygems (LoadError)'
<nortega>
I feel like something is wrong, especially since it says that a file called `ubygems' is missing.
<nortega>
(instead of rubygems)
<nortega>
I've tried looking it up, but I haven't found too much on this.
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<nortega>
I'm running on an ArchLinux system.
<nortega>
I've been trying to install erubis via the AUR.
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<canton7>
nortega, personally I use gem to manage all gems on by arch linux system, and I don't use pacman at all there
<canton7>
'cos if you mix the two, that way lies pain, and not every gem will be in the aur
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<nortega>
Actually, I really just use ruby for some vim plugins and tmuxinator, so pretty much all my gems come from the AUR or the repos (unless the AUR uses `gem').
<nortega>
In any case, what seems to be the typo to this?
<canton7>
the syntax is -rlibrary
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<canton7>
so -rrubygems, not -rubygems
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<nortega>
Oh... that would explain the `ubygems'
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<canton7>
yep
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<nortega>
Alright, that seems to have fixed it. I posted a comment on the AUR page. Thanks.
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<nortega>
Now to see if tmuxinator will install correctly.
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<nortega>
Hmm, seems the tmuxinator package has a similar issue. Is the `-r' flag a new thing?
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<canton7>
nortega, what's your ruby version?
<nortega>
2.5.0
<canton7>
hmm
<canton7>
my `ruby` does actually accept -rubygems just fine
<nortega>
Apparently my ruby version doesn't :/
<canton7>
just try 'ruby -rubygems -e 'puts "hi"'
<nortega>
"cannot load such file -- ubygems (LoadError)"
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<nortega>
As soon as I put the second 'r' it works.
<canton7>
aah, so -rubygems is fine on 2.0.0, and breaks on 2.5.0 (for me as well)
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<dminuoso>
2.0.0, you must be a macOS user who hasnt upgraded yet
<canton7>
nah, windows
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<nortega>
Well, this is arch, the AUR should expect people to have the bleeding edge versions :P
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<canton7>
I don't do much ruby any more, but I keep an installation around
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<yrstrly>
why does this code just return 0...arr1.length rather than counting how many elements in each array are equivalent
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<yrstrly>
both arrays are the same length
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<apeiros>
yrstrly: because the return value of a for loop is the iterated object
<apeiros>
`for x in obj; …; end` will always evaluate to `obj`
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<yrstrly>
Okay I understand that, but how then to change it so it checks each element?
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<yrstrly>
it's returning integers because it's being iterated over an integer?
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<dminuoso>
>> b = 0; a = for 0..10; b += 1; end; puts a
<ruby[bot]>
dminuoso: # => /tmp/execpad-c690920b2671/source-c690920b2671:2: syntax error, unexpected .., expecting &. or :: or ...check link for more (https://eval.in/932160)
<dminuoso>
Blah.
<dminuoso>
>> b = 0; a = for i in 0..10; b += 1; end; puts a
<apeiros>
yrstrly: if you want it to return count, then make count the last statement
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<dminuoso>
yrstrly: for loops itself are expressions.
<apeiros>
and it returns the iterated object because that's what the implementers decided to let it return
<yrstrly>
Thanks very much both
<apeiros>
yrstrly: also quite important: === is *not* testing equality.
<apeiros>
ruby is not like php/javascript where === is a more strict version of ==. === in ruby has entirely different semantics.
<yrstrly>
Thanks I realised that when I posted
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<apeiros>
and your code in short: arr1.zip(arr2).count { |a,b| a == b }
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<yrstrly>
thanks
<apeiros>
oh, wow, no factoid on comparisons :-S
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<apeiros>
!fact add compare equal?, eql?, ==, ===, =~ || equal? tests for identity; eql? tests whether two values are the same hash key or value in a set, == tests with regards to sorting (see <=>), === is for case/when expressions and methods like Enumerable#grep, all?, any?, none? etc.
<ruby[bot]>
apeiros: I will remember that compare is equal?, eql?, ==, ===, =~ || equal? tests for identity; eql? tests whether two values are the same hash key or value in a set, == tests with regards to sorting (see <=>), === is for case/when expressions and methods like Enumerable#grep, all?, any?, none? etc
<ruby[bot]>
.
<apeiros>
?compare
<ruby[bot]>
equal?, eql?, ==, ===, =~ || equal? tests for identity; eql? tests whether two values are the same hash key or value in a set, == tests with regards to sorting (see <=>), === is for case/when expressions and methods like Enumerable#grep, all?, any?, none? etc.
<dminuoso>
apeiros: "identity" needs to be defined into object identity.
<dminuoso>
apeiros: It's a good answer and covers all the cases.
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<dminuoso>
(It's what I used to look up until it was burned into my mind)
<apeiros>
hah, I even commented on it
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<phaul>
somewhat related: the other day I tried to define an object where obj != obj to trick Array#include? so it thinks it's not in. (Codewars Kata - don't ask) Interestingly #include? bypasses == even though the documentation explicitly states otherwise
<apeiros>
!fact ed compare equal?, eql?, ==, === || https://stackoverflow.com/a/7157051 || equal? is obj identity || eql? is hash key/value in a set equality || == is sorting equality (see <=>) || === is for case/when and methods like Enumerable#grep, all?, any?, none? etc.
<ruby[bot]>
apeiros: I stand corrected that compare is equal?, eql?, ==, === || https://stackoverflow.com/a/7157051 || equal? is obj identity || eql? is hash key/value in a set equality || == is sorting equality (see <=>) || === is for case/when and methods like Enumerable#grep, all?, any?, none? etc.
<apeiros>
phaul: it optimizes. it does use ==, but only if the objects aren't the same
<apeiros>
`if (obj1 == obj2) return Qtrue;`
<apeiros>
only after that it goes through the (vastly more expensive) method invocation
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<apeiros>
the underlying assumption of course being that `a.equal?(b)` imlies `a == b`
<dminuoso>
apeiros: I frequently enjoy not having to think about such details in Haskell when requiring Eq is all I need, and any two lists [1,2,3] are considered identical..
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<apeiros>
I can see that
<phaul>
I got to the same conclusion, I just thought it's interesting that the documentation bothers going into explicit details there
<dminuoso>
In Ruby that losely translates to "immutable code" is good.
<apeiros>
I think that's a general truth in programming
<apeiros>
if you can keep things immutable, go for it
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<dminuoso>
apeiros: An interesting thing is how Ruby allows you to do this:
<dminuoso>
Using .equal? I would have accepted this, but == should give me some "WhoKnowsError"
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<apeiros>
dminuoso: why? you want it to return true if it "does the same"?
<dminuoso>
apeiros: Yes, but according to Rice's theorem that's impossible (as it would imply solving the halting problem)
<apeiros>
that's not the semantics of Proc#==, though
<apeiros>
i.e. your expectation is based on a flawed premise
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<dminuoso>
apeiros: Well I expect == to be generic equality (i.e. two objects being extensionally equivalent)
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<dminuoso>
apeiros: (And by extensionally equivalent I mean outside of __id__/.equal?/etc.)
<apeiros>
it's really ordering equality. whether two objects order the same. as in, in terms of <=>. if that's not possible, it's eql? or equal? semantics.
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<apeiros>
at least that's how I understand and implement it. based on docs and Comparable
<dminuoso>
apeiros: I dont think that holds true properly.
<apeiros>
got a case in core/stdlib which would fail that assumption? (not denying that that might be possible)
<dminuoso>
apeiros: The documentation of BasicObject#== itself.
<dminuoso>
apeiros: The thing is, <=> implies a sensible implementation of == due to partial orders being anti symmetric.
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<apeiros>
"Equality --- At the Object level, == returns true only if obj and other are the same object."
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<apeiros>
that's precisely equal? semantics.
<dminuoso>
apeiros: Yes. but not <=> semantics.
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<apeiros>
you've got it the wrong way round
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<apeiros>
iff you can implement a sensible <=>, then == should be implemented in terms of <=>
<apeiros>
see Comparable#==
<dminuoso>
apeiros: absolutely yes, because if your type (i.e. class) is an order, then its anti symmetric.
<dminuoso>
but if its not, then what?
<apeiros>
in all other cases, == should follow either equal? (see Object#==) or eql? semantics.
<dminuoso>
clearly == cant mean "equality based on sorting" because not everything is sortable, but == exists for absolutely everything.
<dminuoso>
because BasicObject imbues everything with #==
<apeiros>
I understand how this can be viewed as an inconsistency and impure. but in practice it IME works quite well.
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<dminuoso>
apeiros: Right, so its not a clear cut "#== means sorting equality" - it means "some generic equality that is sensible for the type of the object". If your type satisfies the Comparable mixin, then because Comparable implies a partial order, then through the antisymmetric relation you have a notion of "two objects being the same"
<dminuoso>
irb
<apeiros>
irb?
<dminuoso>
Hah I hit Cmd+3<cr>irb<cr> so rapidly, without realizing that weechat was in my third tab.
<phaul>
at least irb is not your password :)
<dminuoso>
phaul: Those kinds of mishaps cant happen. Everything uses pub key authentication or 1password here. =)
<dminuoso>
Well I guess there's the macOS password itself...
<dminuoso>
mmm.
<apeiros>
I don't know how to copy & paste my fingerprint
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<dminuoso>
apeiros: I dont envy you. I have a real escape key and F keys.
<dminuoso>
=P
<dminuoso>
I really wish there was a model with physical keys _and_ TouchID..
* apeiros
mumbles something which sounds like "duck you"
<dminuoso>
apeiros: vi user?
<apeiros>
I want: my current model, with the pre-2016 keyboard & touchpad + touchid. plus either a lightning port, or the iphones using usb-c, or the iphones having klinke again
<dminuoso>
Though escape you cant at least remap to capslock, and for vi you should be using Control+[ instead anyway.
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<dminuoso>
The latest iphone without usb was a real insult.
<dminuoso>
Was hoping for Apple to streamline everything to USB C.
<apeiros>
oh, and of course with unsoldered hard drive and ram, and the option to go beyond 16GB (which I had 5y ago already, ffs)
<dminuoso>
apeiros: the new imac pro has unsoldered ram
<apeiros>
same re iphone streamlined to usbc
<dminuoso>
you just have to dish out 5k-6k bucks.
<apeiros>
#ruby-offtopic?
<dminuoso>
Indeed.
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<garyserj>
Is there any way that I can write backslashes without having to escape them? I notice that even with single quotes 'abc\\def' will print abc\def
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<apeiros>
garyserj: in an external file
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<apeiros>
within code, there's no way to quote a string where you never have to escape a backslash
<apeiros>
with single quotes, *most* cases don't need escaping, though
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<apeiros>
>> '\d'
<ruby[bot]>
apeiros: I'm terribly sorry, I could not evaluate your code because of an error: NoMethodError:undefined method `[]' for nil:NilClass
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<duane>
anyone have any experience running traveling ruby as an AWS lambda function?
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<apeiros>
is ruby even supported by aws lambda?
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<duane>
it isnt - but using node as an entry point you can get traveling ruby to run...
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<duane>
i have that working...traveling ruby is claiming that the native pg adapter is not there, but when i switch to a mysql adapter to test...it works just fine
<duane>
maybe more of a traveling ruby/native extension question than an AWS question
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<chrisseaton>
Are frozen string literals garbage collected?
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<havenwood>
chrisseaton: yes
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<havenwood>
chrisseaton: Or at least I'd have sworn they were, but I can't seem to reproduce it actually.
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<apeiros>
havenwood: why'd they be garbage collected? only case I could imagine is if a source file as a whole would be unloaded, no? or a piece of code lexically containing that literal (as in: remove_const or undef etc.)
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<chrisseaton>
apeiros: string constants at the top level of a file for example - think of all those require statements!
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<apeiros>
chrisseaton: ah yeah, makes sense
<apeiros>
they go out of scope
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<apeiros>
and there isn't necessarily any reference left. I see.
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<mgalgs>
So I'm sure I'm missing something simple, but does anyone know off-hand why my `bundle info middleman` works but `bundle exec middleman` doesn't?? I've already done a `bundle install`.
* baweaver
should probably update the article to clarify that it's out now
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<leitz>
Interesting. test-unit gives an error if you use the "ruby methods default to the last action" bit.
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<zenspider>
havenwood: leaking passwords?
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<zenspider>
leitz: what does that mean?
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<elim_garak>
if im wanting to install rubygems on ubuntu so i can install and use jekyll, do i use my distros package by using apt-get install rubygems ?
<leitz>
zenspider, this is the error. "career.rb:52: warning: assigned but unused variable - skill_options"
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<leitz>
zenspider, if I add a "return skill_options" after line 55, the warning goes away.
<zenspider>
leitz: it's a warning and not an error, and it has nothing to do with test_unit... just ruby. You activate it by running with warnings on (`ruby -w` or `$-w = true`) and I recommend it.
<zenspider>
you also fix that code by removing the assignment entirely
<zenspider>
there's no need
<zenspider>
and don't use return unless you actually need to cut out early
<zenspider>
(you don't here)
<leitz>
Why don't I need the assignment?
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<leitz>
I know I don't need the return, except to silence the warning.
<baweaver>
"assigned but unused variable"
<baweaver>
that
<zenspider>
because ruby. you just want to return the value. you're not doing anything with the name you're assigning it to
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<baweaver>
zenspider: meltdown / spectre CPU bug
<zenspider>
oh that shit
<leitz>
baweaver, that shows Ruby seems to mission the point.
<leitz>
The assignment is needed when it is needed. Not all the time.
<zenspider>
you wrote the code. you missed the point.
<baweaver>
Ruby implies returns, no need for a variable
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<baweaver>
If your 5 line method isn't adequately named enough to show that then there's your issue
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<leitz>
Ah, so you're saying change L52 to: @skill_options + @advanced_skill_options ?
<zenspider>
yes: that's what I said in: "fix that code by removing the assignment entirely"
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<leitz>
zenspider, it took me a while to get that. It's been a long day.
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<leitz>
Also, to your "MAGIC_VALUES" point, the upp is becoming a hash and the key is non-magical.
<leitz>
Still working on that bit.
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<troydm>
I know this question might sound dumb but if I have defined class in some module how do I include it in rspec describe for testing so I could reference it by name directly instead of writing Module::Class
<zenspider>
not dumb
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<zenspider>
so it is just a stand alone module and you need to test it via some instance or something?
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<zenspider>
!connection ~k1ltzman@95.215.47.208
<ruby[bot]>
zenspider: Could not process command, usage: !connection nick [channel]