#ruby on 2021-03-05 — irc logs at freenode.irclog.whitequark.org

2020-12-25 00:04 havenwood changed the topic of #ruby to: Rules: https://ruby-community.com | Ruby 3.0.0, 2.7.2, 2.6.6: https://www.ruby-lang.org | Paste 4+ lines of text to https://dpaste.org | Books: https://goo.gl/wpGhoQ | Logs: https://irclog.whitequark.org/ruby | BLM <3

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00:09 <tempate> Is there a way to get elements at different indexes from an array all at once?

00:10 <tempate> [3,1,4,1,5].get([0, 2]) would give [3,4]

00:10 <tempate> something like that

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00:14 <al2o3-cr> tempate: values_at

00:15 <tempate> al2o3-cr: thank you very much

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00:15 <al2o3-cr> np :)

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05:28 <akem> hey

05:28 <akem> why ruby -e 'puts "10".hex' returns 16 and not A?

05:30 <havenwood> akem: 10.to_s(16) is the other way around.

05:31 <havenwood> akem: '10'.hex is like '10'.to_i(16)

05:31 <havenwood> akem: (10 is the hex, 16 is the base 10)

05:35 <akem> havenwood: how can i print an hex to a dec? print "%d" % \xff ?

05:35 <akem> 255

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05:37 <havenwood> akem: "\xff".bytes #=> [255]

05:38 <akem> Thank you havenwood.

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05:43 <havenwood> akem: "\xff".unpack1('H*').hex #=> 255

05:43 <havenwood> akem: You're welcome.

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06:58 <nakilon> &>> 0xff

06:58 <rubydoc_> # => 255 (https://carc.in/#/r/ai0h)

06:59 <nakilon> I don't see a sign that he had it as a String instance

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07:09 <havenwood> puts "\xff"

07:09 <havenwood> nakilon: That ^ doesn't do what they want but 0xff would have already worked.

07:10 <havenwood> nakilon: I assumed it was a String, I think correctly.

07:12 <havenwood> print "%d" % 0xff #>> 255

07:12 <havenwood> So they'd not ask why it doesn't work, since it does. ¯\_(ツ)_/¯

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07:17 <havenwood> nakilon: Maybe there was a grander question and I missed it?

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07:17 <havenwood> akem: Was \xff that you wrote above meant to be a String and you just omitted the quotes?

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07:24 <akem> havenwood: i meant 0xff, just typing convention mismatch. nm.

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07:25 <havenwood> akem: Oh, then you can just: print 0xff

07:25 <havenwood> akem: Is that what you meant?

07:25 <havenwood> nakilon: I guess you were right!

07:26 <akem> havenwood: yeah, you're right it prints in decimal.

07:28 <akem> I use ruby on Android on Termux terminal, it's great.

07:28 <akem> just like on a real linux box.

07:29 <akem> ruby 3.0

07:34 <havenwood> &>> [0e10, 0b10, 0o10, 0d10, 0x10]

07:34 <rubydoc_> # => [0.0, 2, 8, 10, 16] (https://carc.in/#/r/ai0l)

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07:40 <akem> havenwood: what is the first one 'e'?

07:41 <havenwood> akem: scientific notation

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07:41 <havenwood> akem: one unlike the others :)

07:42 <havenwood> exponential notation

07:42 <akem> &>> [0e20]

07:42 <rubydoc_> # => [0.0] (https://carc.in/#/r/ai0m)

07:42 <akem> Ok.

07:43 <akem> never had any use for it, i guess maybe for math people it may be usefull.

07:44 <havenwood> &>> 4.2e-3

07:44 <rubydoc_> # => 0.0042 (https://carc.in/#/r/ai0n)

07:44 <havenwood> &>> 4.2e3

07:44 <rubydoc_> # => 4200.0 (https://carc.in/#/r/ai0o)

07:44 <havenwood> akem: That ^ kinda stuff.

07:44 <akem> Haa ok...right havenwood, now i get it.

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08:44 <tempate> Is it possible to test a function that isn't part of a class with rspec?

08:45 <tempate> I have https://dpaste.org/yQTK right now but it's not giving an output

08:50 <tempate> Alright, I was importing rspec instead of rspect/autorun

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10:33 <tempate> Is there a better way to do 9.times.map{ [] } ?

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11:26 <adam12> tempate: Better how?

11:26 <tempate> adam12: I meant in a more idiomatic way. [] * 9 doesn't work, for instance.

11:28 <adam12> tempate: There’s `Array.new(9) { [] }`

11:29 <tempate> oh right!

11:29 <adam12> tempate: If `[] * 9` could work, it would be risky because `[]` would be the same object each time.

11:30 <adam12> tempate: There’s `Array.new(9, [])` that suffers the same.

11:30 <tempate> adam12: I hadn't thought of that

11:30 <adam12> tempate: If you would do ary[0] << “ohai”, all of them would have the same “ohai” string in them.

11:31 <adam12> Tho I guess Ruby could be smart about it and call dup on the object. But it doesn’t afaik.

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18:47 <englosh> if I define a function/method on the top-level like `def hello; end` then is that a method or a function? I'd say function but would most others say method?

18:48 <WA9ACE> it becomes a method on the object Kernel

18:48 <englosh> right, it automatically becomes part of a class if you define it on the top level

18:49 <WA9ACE> yeah

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19:29 <adam12> Just to clarify, it’s actually `main` that receives the `hello` method.

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19:31 <WA9ACE> oh yup, you're right, for some reason I was thinking that was only in IRB

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19:35 <adam12> WA9ACE: I had to check too.

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