<< 01-09-2018 >>
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00:14:50FromDiscord<emekoi> thanks, but my error was something else.
00:24:08FromGitter<data-man> Which error?
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02:00:55FromGitter<girng> hello I was thinking of using nim for a gameserver, good idea?
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02:02:42leorizeeverything with nim is a good idea :)
02:03:38FromGitter<girng> @leorize ty, i'm coming from crystal lang
02:04:29FromGitter<girng> i love it, but want to try something new for a change
02:04:36FromGitter<girng> i've heard good things about nim
02:06:06FromGitter<girng> i'm wanting to create a simple ping/pong tcp server and stick it on my vps and test some stuff
02:06:25FromGitter<girng> i will read docs and tuts now and come back if i run into anything ty
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03:08:17FromDiscord<emekoi> i keep getting error when i try to get the address of a let variable with`unsafeAddr`. i get: `Error: expression has no address; maybe use 'unsafeAddr'`.
03:15:44leorizeemekoi: can you give us the example code?
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03:23:19FromDiscord<emekoi> this is on devel currenty: https://paste.ee/p/flC3I
03:31:04leorizelooks like a parser bug of sorts
03:31:20leorizeif you extract the unsafeAddr part to a variable, then it work
03:31:24FromGitter<data-man> In devel-branch there is ```proc toOpenArrayByte*(x: string; first, last: int): openarray[byte]``` Use it.
03:33:26FromDiscord<emekoi> yeah, i need to update my devel
03:33:39leorizeemekoi: please file an issue for that snippet
03:34:30FromDiscord<emekoi> ok
03:43:51FromGitter<data-man> No. The compiler is always right! :) You need to check ```yourstring.len != 0```
03:54:02FromDiscord<emekoi> the string length wasn't 0, but `toOpenArrayByte` works like a charm!
03:59:03FromGitter<data-man> I know ;) https://github.com/nim-lang/Nim/pull/7820
04:00:37FromDiscord<emekoi> kinda offtopic but does anyone know how you would get arguments passed to a function written in assembly?
04:06:55FromGitter<MisterBianco> Passing arguments in assembly is done by pushing values to the stack and popping them in the reverse order in which you pushed them.
04:31:49FromDiscord<emekoi> so in the assembly i would have `pop eax`, `pop ecx`? and is `mov eax, [esp+4]` and `mov ecx, [esp+8]` equivalent when the args are 32bit ints?
04:32:30leorizeemekoi: https://nim-lang.org/docs/manual.html#statements-and-expressions-assembler-statement
04:32:51leorizethe example shows how to access them
04:44:19FromDiscord<emekoi> i know how to use the asm statement. i'm building a "JIT" compiler in nim and i trying to jit a proc that adds two numbers, but keep getting weird results.
04:53:30FromGitter<rayman22201> https://www.csee.umbc.edu/~chang/cs313.s02/stack.shtml
04:53:44FromGitter<rayman22201> @emekoi
05:03:12FromGitter<rayman22201> nim uses standard C calling convention, so, assuming you have the address of the stack (ESP on x86) you should be able to do some simple math to get the arguments.
05:07:41FromGitter<data-man> @emekoi: Maybe useful for you https://github.com/jangko/nimJIT (unfortunately, it's not finished) Just for future ideas.
05:10:52FromGitter<rayman22201> @emekoi: It's possible that your math might be off. IDK the types of the arguments, but I think it's EBP + 8 and EBP + 12 (at least on a 64bit machine)
05:11:04FromGitter<rayman22201> for ints
05:11:51FromGitter<rayman22201> @data-man that looks neat
05:14:36FromDiscord<emekoi> does anyone know the new location for nimblecache?
05:14:54FromDiscord<emekoi> *nimcache
05:15:07FromDiscord<emekoi> nvm i found it
05:16:49FromGitter<data-man> IMO, the best way is to wrap some C/C++ library. E.g. GNU lightning, libjit, asmjit, xbyak and so on.
05:20:11FromDiscord<emekoi> yeah, but i want to do it from scratch...
05:24:45FromGitter<data-man> Of course it's very exciting. Good luck!
05:32:36FromDiscord<emekoi> thanks!
05:41:27FromGitter<Araq> use luajit's approach.
05:43:09FromGitter<Araq> @rayman22201 actually Nim on Windows uses the `fastcall` calling convention.
05:45:46FromGitter<rayman22201> Oh really
05:45:56FromGitter<rayman22201> Interesting. Good to know
05:47:39FromGitter<rayman22201> That's actually pretty cool that nim uses fastcall
05:50:28FromDiscord<emekoi> yeah, i'm on windows so i VirtualAlloc some memory, write to itm then set it to be executable. right now i'm using nasm to emit the machine code until i write an assembler myelf. i'm thinking about using templates or macros to try to generate the machine code at compile time.
05:58:39FromGitter<Araq> check out LuaJIT, it uses a custom DSL-to-C intermediate step that can be reproduced with Nim's macro system
05:59:32FromDiscord<emekoi> i've used dynasm before, and apart from the preprocessor step it was quite nice.
06:40:40FromDiscord<treeform> Hey guys, thoughts or feedback on my OpenAL wrapper: https://github.com/treeform/openal ?
06:42:20leorizeI think it would be better without `al` prefix
06:44:06leorizeand certainly `ALuint` and friends isn't helpful at all
06:44:08FromDiscord<treeform> leorize, I am just following convention on how nim's OpenGL library works.
06:44:50FromDiscord<treeform> https://github.com/nim-lang/opengl/blob/master/src/opengl/private/types.nim
06:45:03FromDiscord<treeform> I think its best to be consistent with existing things.
06:45:07leorizethey're private for a reason...
06:45:47FromDiscord<treeform> They are public because of *, but they are in private dir, which I did not copy.
06:47:24FromDiscord<treeform> I wanted to wrap OpenAL as close to C as possible. But I also want to make a high level API that does sound at a later date. That will be way more nim-like.
06:47:35FromDiscord<treeform> Have you used nim's OpenGL library?
06:47:47leorizeno, but I've used the sdl2 library
06:48:28leorizeit strips away the SDL_ prefix for most of the stuff, which I personally prefer
06:48:49FromDiscord<treeform> I have not used the sdl2, did the glfw+OpenGL.
06:49:38FromDiscord<treeform> I agree prefix can be obnoxious. But they do make the C code and nim code look more alike. Hmm ill think about this.
06:53:11leorizethe only reason why they have prefixes on everything is because C doesn't have a namespace system
06:53:33leorizeif you want Nim code to look more like C, you can just do <moduleName>.<proc>()
06:53:40FromDiscord<treeform> but why does nim's openGL lib keep the prefixes?
06:55:45leorizeno idea, but it's also worth to note that many other wrappers tend to strip the prefix
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07:48:00FromGitter<Araq> wrappers should strip away the prefixes.
07:49:52FromGitter<Araq> it's nice that you plan to have a high level API too, but 100s of `template foo(args) = prefix_foo(args)` helpers are worse than starting without the prefixes. Usually >80% of the calls are already "high level".
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08:29:05FromGitter<mratsim> @emekoi check the tutorials to build a JIT for Brainfuck. I wanted to explore that as well but figures it’s too time consuming while I have loads of other stuff I want to do
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08:35:46FromGitter<xmonader> @dom96 from what i see in redis client source code it doesn't support returnting nested array `RedisList` is just `seq[RedisString]` not a seq of redis objects?
08:44:07FromGitter<xmonader> https://github.com/nim-lang/redis/issues/11
08:44:38FromGitter<Araq> @xmonader fix it, change it
08:44:53FromGitter<Araq> make a pull request
08:45:15FromGitter<xmonader> @Araq yeah i'm digging into the code
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08:48:36ftsfseems like it'd be difficult to do as a macro? but I'm not good with macros
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08:49:44FromGitter<mratsim> are you talking about “this” fits?
08:49:52FromGitter<mratsim> ftsf*
08:50:08FromGitter<dom96> How do you get such nesting @xmonader?
08:52:39FromGitter<xmonader> @dom96 we implement servers on redis protocol try executing scan here ⏎ redis-cli -h playground.hub.grid.tf -p 9910
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09:03:33FromGitter<Araq> are there any pure Nim compression libs around?
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09:10:39FromGitter<dom96> Not at a computer right now. But I believe you :)
09:11:19FromGitter<dom96> @Araq untar but that's for decompression
09:13:22FromGitter<xmonader> @dom96 to change this i need to convert to a variant or something else?
09:13:47FromGitter<xmonader> i'd like to do minimal changes in the code without lots of impacts
09:16:46FromGitter<data-man> @Araq https://github.com/jangko/nimz
09:21:09FromGitter<mratsim> I thought that was the point of this :P https://github.com/NimCompression
09:21:40FromGitter<mratsim> You can ask Bulat to build one maybe he is a compression expert: https://github.com/Bulat-Ziganshin
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09:32:40FromGitter<xmonader> Is there a way to have seq[object] ?or seq[any] ? or it requires a variant?
09:41:29PMunchWhat problem are you trying to solve xmonader?
09:43:44PMunchJust checked and 24th Nov. is the deadline for proposing a lighting talk at FOSDEM
09:43:51PMunchSo we still have some time
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09:56:49FromGitter<xmonader> @PMunch I want a definition for RedisList to be flexible enough to hold any redis value (str, int, list, ..)
09:56:58FromGitter<xmonader> without having to drastically change the code
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10:04:59dom96xmonader: you need a variant
10:06:37dom96It sucks a bit. But the redis module needs changes anyway
10:06:42dom96A) It uses nil
10:06:52dom96and it has this weird `redisNil` thing which I want to get rid of
10:08:52FromGitter<Araq> +1
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10:14:52PMunchHmm, can't you do "export some/thing"
10:15:08PMunchI want to have "import sdl2/image; export sdl2/image"
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10:15:24dom96You can AFAIK
10:15:29PMunchTrying to add some common imports and types into a single file
10:15:36FromGitter<mratsim> you need to export image
10:15:41FromGitter<mratsim> not sdl2/image
10:15:50PMunchAh
10:15:55PMunchThat's confusing :P
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10:33:09dom96PMunch: RFC :P
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11:01:58FromGitter<bung87> ```code paste, see link``` [https://gitter.im/nim-lang/Nim?at=5b8a71a6f86b741b05f2e3f8]
11:02:27FromGitter<bung87> how to do it right ? very slow
11:03:08FromGitter<Araq> it's perfectly logical imo, you can only export the symbols you already have available, so it's `export module.foo` or just `export foo` and not `export module/foo`
11:14:41FromGitter<bung87> never mind
11:26:12PMunchHmm, I guess that makes sense
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11:37:01FromGitter<mratsim> @bung87, I suppose it’s a benchmark because you can just take the last line. It’s always the same issue, avoid allocating memory: lcut will allocate, join will allocate. I don’t know what cut does but if it’s supposed to replace new lines by '/', just use replace
11:44:06FromGitter<Araq> with the new runtime you will be able to do `withScratchRegion: <stuff here>` and keep the allocation heavy code
11:44:18FromGitter<Araq> and yet it will run much faster.
11:44:27FromGitter<Araq> well this will need some benchmarking :-)
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11:53:27FromGitter<bung87> hmm still have no idea about how to avoiding this, compare to python a little bit faster but to c++ benchmark ,very slow.
11:55:35FromGitter<bung87> @mratsim you can see the code here https://github.com/bung87/finalseg/blob/master/src/finalseg.nim
11:58:14FromGitter<bung87> the project is all about string or seq of string , so if it get optimized, speed gets up .
11:59:02krux02bung87: there isn't much that can be optimized in seq or string
11:59:03FromGitter<mratsim> I’m pretty sure the C++ is reusing buffers everywhere to avoid allocation
11:59:25krux02but sometimes it might be better to use a single string with separators instead of seq[string]
11:59:36krux02seq[string] is non-local memory
12:00:10krux02scanning through every string is a seq of string can be scanning though fragmented memory, which is slow
12:00:48FromGitter<mratsim> anyway, if you want to optimize this, if you’re on mac, compile with `-d:release` and run it with “Apple Instruments"
12:02:26FromGitter<mratsim> Then locate the parts where you code spend the most time like I do here: https://github.com/mratsim/Arraymancer/issues/195
12:03:09FromGitter<mratsim> or here: https://github.com/mratsim/Arraymancer/issues/221
12:03:58FromGitter<mratsim> Once located, rewrite the code.
12:04:42FromGitter<mratsim> If you’re not on Mac, you need to find something similar to the Time Profiler in Apple Instruments
12:05:56krux02valgrind chachegrind
12:06:28FromGitter<bung87> ok thanks, aware of I removed xcode to save bandwidth ...
12:06:48krux02https://github.com/gperftools/gperftools
12:06:51FromGitter<Araq> runes = sentence.toRunes() # slow and not required
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12:07:39FromGitter<bung87> c++ version all pass a iterator before perform string result
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12:09:16FromGitter<Araq> and the code screams "I want a real parser"
12:09:18FromGitter<bung87> @Araq viterbi proc not requires but in `iterator internal_cut` needs slice
12:10:47FromGitter<Araq> speaking of which ...
12:11:14*FromGitter * Araq removes bullshit startsWith parsing from nimsuggest's tester. Amateurs.
12:11:23FromGitter<bung87> https://github.com/bung87/finalseg/blob/8ea55633466b00ea412fbea02b583f5ecc551ac3/src/finalseg.nim#L141
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12:16:37FromGitter<bung87> you meaning parsing first word and then computing is bad?
12:24:20FromGitter<mratsim> I think Araq means, if speed is critical, implement a state-machine based parser.
12:24:27FromGitter<mratsim> aka a real parser
12:31:22FromGitter<Araq> look at Nim's `scanf` for inspiration
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12:46:16FromGitter<mratsim> @timotheecour I think this https://github.com/nim-lang/Nim/issues/8432 should be renamed [Regression] Closure + Generics leads to stack overflow in VM
12:52:54dom96I'm really disappointed in Freenode right now
12:53:00dom96The channel is /still/ being spammed
12:54:46federico3is it?
12:58:09krux02I don't see spam
12:58:28krux02dom96, is there a spam filter in this channel?
12:58:39dom96Yes, all unregistered users are muted
12:58:43dom96I can see them because I've got +o
12:59:26FromGitter<bung87> @Araq @mratsim thanks, learning it
12:59:31krux02the unregistered user get notified that they ar muted?
13:03:58krux02mratsim: "`nim c test.nim` fails" is not a good name for an issue
13:04:10krux02the problem is not that the test fails
13:04:12krux02it is your test
13:04:18krux02not a test in nim
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13:04:43FromGitter<mratsim> I wasn’t the one who raised the issue
13:04:57krux02oh sorry
13:05:12FromGitter<mratsim> if anything we both agree ;)
13:05:15krux02timotheecour: I meant you
13:07:55FromGitter<mratsim> Wasn’t it possible to doAssert all expressions in a block? ⏎ ⏎ ```code paste, see link``` [https://gitter.im/nim-lang/Nim?at=5b8a8f2bc9500b4bab682c7e]
13:08:52FromGitter<mratsim> (I can use a macro but iirc we could do that, or I’m confusing with check: in unittest)
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13:35:12krux02that is not really possible with a macro
13:35:59krux02the sem checker will complain about unused bool
13:36:44krux02andyou need the sem checker before the macro invocation to insert an assert at all bool expressions
13:42:29FromGitter<mratsim> the `check` macro in unittest manages to do it.
13:42:51FromGitter<mratsim> but maybe it doesn’t check for statement vs expressions
13:52:55dom96krux02: they aren't notified
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13:57:38krux02dom96: they should
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16:03:39FromGitter<xmonader> How do i pass nil to a variant object? ⏎ ⏎ ```code paste, see link``` [https://gitter.im/nim-lang/Nim?at=5b8ab85a4be56c5918c8f065]
16:03:57FromGitter<xmonader> ``````
16:05:41FromGitter<xmonader> I see ⏎ ⏎ ``` redisNil* = "\0\0"``` ⏎ ⏎ is it the expected value instead of nils? [https://gitter.im/nim-lang/Nim?at=5b8ab8d511b41f69dba62c5b]
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16:15:01FromGitter<xmonader> I'm going for the \0\0 for now, here's the code tell me what you think and if it's good enough i'll continue on to refactor the code in nim-lang/redis package to use it ⏎ https://github.com/xmonader/nim-resp/blob/master/src/nim_resp.nim ⏎ ⏎ and it supports recursive values ⏎ @dom96 [https://gitter.im/nim-lang/Nim?at=5b8abb0511b41f69dba63995]
16:26:32FromGitter<mratsim> you can’t pass nil to a stack object
16:29:02FromGitter<xmonader> @mratsim oh thanks! i guess \0\0 is good enough then
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16:30:17FromGitter<mratsim> if you cast a nil pointer to an integer you should get 0 (or ‘\0’ if you like that notation)
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16:32:49FromGitter<xmonader> I see thanks @mratsim :)
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17:38:40FromDiscord<Gilgamish> Guys I'm getitng a somewhat cryptic error message, any help is appreciated!
17:38:40FromDiscord<Gilgamish>
17:38:40FromDiscord<Gilgamish> This is the module creating the error.
17:38:40FromDiscord<Gilgamish>
17:38:40FromDiscord<Gilgamish> ```
17:38:40FromDiscord<Gilgamish> type
17:38:41FromDiscord<Gilgamish> Map* = object
17:38:42FromDiscord<Gilgamish> width : int
17:38:44FromDiscord<Gilgamish> map : seq
17:38:44FromDiscord<Gilgamish>
17:38:46FromDiscord<Gilgamish> proc createMap(x : int, y : int) : Map =
17:38:47FromDiscord<Gilgamish> new Map(x, newSeq[int](x*y))
17:38:48FromDiscord<Gilgamish> ```
17:38:50FromDiscord<Gilgamish>
17:38:51FromDiscord<Gilgamish> Error:
17:38:52FromDiscord<Gilgamish> ```
17:38:54FromDiscord<Gilgamish> Error: invalid type: 'T' in this context: 'proc (x: int, y: int): Map' for proc
17:38:56FromDiscord<Gilgamish> ```
17:39:10FromDiscord<Gilgamish> It sounds like parameterized types error, even though I'm not using generics
17:39:55TheLemonManyour `map` should be a `seq[int]` instead of just `seq`
17:40:35FromDiscord<Gilgamish> Thanks bot!
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17:43:53FromDiscord<Gilgamish> Obs, I mean thanks TheLemonMan
17:44:33TheLemonMannp, I've been called worse than bot :P
17:46:35FromDiscord<Gilgamish> The gitterirc thing threw me off, many thanks man 😃
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18:07:58FromDiscord<Gilgamish> getting ```Error: attempting to call undeclared routine: 'Map' ``` on:
18:07:58FromDiscord<Gilgamish>
18:07:58FromDiscord<Gilgamish> ```
18:07:58FromDiscord<Gilgamish> type
18:07:58FromDiscord<Gilgamish> Map* = object
18:07:59FromDiscord<Gilgamish> width : int
18:07:59FromDiscord<Gilgamish> map : seq[int]
18:08:00FromDiscord<Gilgamish>
18:08:02FromDiscord<Gilgamish> proc createMap*(x : int, y : int) : Map =
18:08:04FromDiscord<Gilgamish> return Map(x, newSeq(x*y))
18:08:04FromDiscord<Gilgamish> ```
18:08:52FromDiscord<Gilgamish> I'm hoping to build a random 2d dungeone generator but moving in 2d space is quite difficult without multidimensional arrays
18:08:55TheLemonManyeah, you need `Map(width: x, map: newSeq[int](x+y))`
18:09:48FromDiscord<Gilgamish> Ah, so you need to specify the variables in the constructor?
18:10:33FromDiscord<Gilgamish> Yes! it compiles, thanks!
18:10:33TheLemonManyep, that's nice because you cant fuck up anything if you move the fields around
18:11:36FromDiscord<Gilgamish> Yeah I can see why it's designed like that. That way certain errors can be caught.
18:17:05FromGitter<ephja> now we just need it for procs and to make use of more distinct types :-)
18:20:04TheLemonManahh, I hate when the bootstrap unveils new bugs in a PR :P
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20:11:13FromGitter<kayabaNerve> Here's an interesting bug. Looks to be my code, but not Nim...
20:11:24FromGitter<kayabaNerve> Though I did find a bug in Nim along the way.
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20:12:16FromGitter<kayabaNerve> https://github.com/EmberCrypto/Events/blob/master/events.nim ⏎ https://github.com/EmberCrypto/Events/blob/master/examples/A.nim ⏎ ⏎ Only the last defined event works. [https://gitter.im/nim-lang/Nim?at=5b8af2a0f86b741b05f5a0b7]
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20:28:30FromGitter<kayabaNerve> Fixed it. ⏎ ⏎ ```Table[] = cast[HandlerParent]( ⏎ Handler[T]( ⏎ value: value ⏎ ) ⏎ )``` ⏎ ⏎ I have no idea why it matters but it does. [https://gitter.im/nim-lang/Nim?at=5b8af66ec9500b4bab6a5f3a]
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22:55:09FromGitter<bung87> what's Bitwise OR ,Bitwise AND operator in Nim ?
22:56:36FromGitter<ephja> or/and :-P
22:59:18FromGitter<bung87> wow just that
23:02:19FromGitter<ephja> there's no need for separate operators because of the more precise typing compared to C
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23:24:48FromGitter<bung87> thanks ! I barely use these know these in js and python
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23:54:51FromGitter<bung87> I got `MD5Digest` and it can use `$` convert to string, but how to do like `parseInt('0cc175b9c0f1b6a831c399e269772661',16)`