05:55 <avane> hey all. I would like to get a specific portion of a file using hex locations (e.g. 0x123 - 0x125) and store it into a variable. how would I go about doing this?

06:02 <FromGitter> <HertzDevil> `IO#read_at(0x123, 3, &.gets_to_end)`

12:06 <FromGitter> <phykos> hello there

12:06 <FromGitter> <phykos> I am looking for something like `Int#chr` but returning a c-like char

12:07 <FromGitter> <phykos> I mean `255.times { |i| puts(i.chr) }`

12:07 <FromGitter> <phykos> In Ruby it has a different behavious

12:07 <FromGitter> <phykos> behaviour

12:12 <jhass> STDOUT.write_byte i

12:15 <FromGitter> <phykos> yes but I want to save the result to a variable and not write it to the stdout

12:15 <jhass> why?

12:16 <FromGitter> <phykos> anyway just tested that line of both Ruby and Crystal and it does the same thing , I missed something

12:16 <FromGitter> <phykos> I am implementing the mandelbrot program from benchmarks game and it is slow to print it while iterating

12:17 <jhass> You can use String.build to get an IO for building a string

12:17 <jhass> but the difference to using a buffered IO shouldn't be big

12:18 <FromGitter> <phykos> yeah, this is big brain time

12:22 <FromGitter> <phykos> nope, that yields a block and I have to do that 2 times

12:23 <jhass> well just put the block around both

12:25 <FromGitter> <phykos> 1 - isn't it inefficient? ⏎ 2 - I don't exactly know the capacity of the string, I'll be overallocating stuff

13:59 <FromGitter> <asterite> you can do `STDOUT.sync = false` then manually flush

13:59 <FromGitter> <asterite> After you call the global `puts` or `print` it always flushes on a terminal, if I remember correctly

18:05 <FromGitter> <Daniel-Worrall> Is select timeout documented anywhere cause I'm only coming across the Issue/PR

18:10 <oprypin> no

18:11 <oprypin> hm thinking how to find if there are no zeros in a nested array

18:12 <FromGitter> <Blacksmoke16> `array.none? &.zero?`?

18:12 <oprypin> `[[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]].all?(&.none?(&.zero?))`

18:12 <FromGitter> <Blacksmoke16> er if its nested, `array.all? &.none? &.zero?`

18:13 <oprypin> is confusing though what do u mean all none xD

18:13 <FromGitter> <Blacksmoke16> yea :p

18:13 <oprypin> wait `.all?(&.all?(&.>(0)))` actually works?

18:14 <FromGitter> <Blacksmoke16> why wouldnt it?

18:43 <oprypin> radical~ https://github.com/oprypin/crystal-imgui/commit/3be6deebf8cb608071cea363edd0d8f71139f520

18:54 <yxhuvud> oprypin: that's how half my code for aoc looks like :)

18:54 <oprypin> hmm?

18:54 <oprypin> oh you're commenting on the prior thing

18:54 <yxhuvud> lots of nested levels of &. blocks :)

21:35 <FromGitter> <j8r> What does `Object#==`? It's just an abstract def on object.cr, but it works on any `class`

21:37 <FromGitter> <j8r> Ho, found a "bug": https://crystal-lang.org/api/master/Struct.html#direct-known-subclasses ⏎ There are hidden object listed

21:44 <oprypin> j8r, https://crystal-lang.org/api/master/Reference.html#==(other:self)-instance-method https://crystal-lang.org/api/master/Value.html#==(other)-instance-method

21:44 <oprypin> https://crystal-lang.org/api/master/Struct.html#==(other):Bool-instance-method

22:03 <FromGitter> <j8r> ok thanks

22:05 <FromGitter> <j8r> A bit mystic this things

22:05 <FromGitter> <j8r> `abstract struct Struct` ?

22:06 <FromGitter> <j8r> Also it is said that Struct inherits from Value, which inherits from Object, which is a class

22:06 <FromGitter> <Blacksmoke16> *magic*

22:10 <FromGitter> <j8r> I guess, primitives are magic - handled directly by the compiler

22:10 <FromGitter> <Blacksmoke16> yea

22:13 <FromGitter> <lbarasti> Hi folks, I'm streaming on Twitch tomorrow at 7pm BST. I'd like to talk about Crystal and application metrics. ⏎ Would someone like to join me to explore some Prometheus queries - I'm not well versed in those - and chat about observability?

22:13 <FromGitter> <lbarasti> I'll send this again tomorrow, just in case a potential reader misses it :D

22:14 <FromGitter> <j8r> you expose Crystal metrics in the Prometheus format, which ones?

22:15 <FromGitter> <lbarasti> I was planning on starting with the basics included in https://github.com/Darwinnn/crometheus/

22:15 <FromGitter> <lbarasti> then add some fiber's heartbeat

22:16 <FromGitter> <lbarasti> counting the number of times tasks happen

22:16 <FromGitter> <lbarasti> very open ended

22:17 <FromGitter> <lbarasti> I'm not an expert on the topic by any means, so wanted to turn this into a conversation

22:17 <FromGitter> <j8r> Ha I got something for fibers

22:18 <FromGitter> <j8r> https://carc.in/#/r/9tck

22:21 <oprypin> @j8r: object

22:21 <oprypin> @j8r: Object is entirely fake; Value and Reference are the only true bases

22:23 <oprypin> and yes Value itself is still largely fake because it's impossible to create one

22:23 <FromGitter> <j8r> the cake is a lie!

22:23 <FromGitter> <j8r> (not https://github.com/axvm/cake)

22:23 <FromGitter> <lbarasti> ah, thanks! I had this :D ⏎ ⏎ ```code paste, see link``` [https://gitter.im/crystal-lang/crystal?at=5f80e2f902e81701b0106f75]

22:24 <FromGitter> <lbarasti> how unsafe is unsafe_each, I'd like to understand better

22:24 <FromGitter> <j8r> better avoiding monkey patching

22:25 <FromGitter> <j8r> I think it is ok we don't modify anything

22:25 <oprypin> which unsafe_each is it? of which type

22:25 <FromGitter> <j8r> *if we don't modify anything

22:25 <FromGitter> <lbarasti> 👍

22:26 <FromGitter> <j8r> `Thread#unsafe_each`

22:27 <FromGitter> <j8r> also, you can have fibers for each thread

22:27 <FromGitter> <lbarasti> oh, I see, so if I'm in multi-threaded mode I will be missing out on fibers if I run my snippet

22:27 <FromGitter> <lbarasti> that's really useful, thanks