(f << g)
#dev-general
prisma wave
oh yeah
old wyvern
old wyvern
jovial warren
lol
I think functional programming definitely has it's uses
stuff like Minecraft is not one of them though
old wyvern
Why not?
jovial warren
because Minecraft requires a hell of a lot of data storage
old wyvern
So?
jovial warren
and unless your language is good at representing data in memory, you'll have a hard job with Minecraft
old wyvern
Im pretty sure that statement is biased towards oop
jovial warren
maybe
old wyvern
Obviously you wouldnt model your application in the same way
old wyvern
No issues with that tho?
jovial warren
worlds, dimensions, biomes, players, etc.
old wyvern
There still is no issue
jovial warren
idk what functional languages are like at storing data
regal gale
Suggestion for my nms practice pls?
hot hull
You don't even need to use NMS to achieve that, pretty boring
jovial warren
Suggestion for my nms practice pls?
schematics
take a look at SSB (Superior Skyblock) for examples
prisma wave
idk what functional languages are like at storing data
Fine?
jovial warren
suppose it varies
prisma wave
Functional languages still have records or similar things
old wyvern
mhm
jovial warren
some do
prisma wave
Most do
prisma wave
Any language without data types is pretty much useless
jovial warren
very true
old wyvern
mhm
prisma wave
Even more useless than a 100% pure language
jovial warren
might as well be assembly if it has no data types lel
but even assembly has data types
prisma wave
Now you might have a point if you said that games usually require a lot of state changing
Although most fp languages have abstractions for this
Because ofc state is necessary sometimes
jovial warren
also, I'm using bit shifting over multiplication from now on
prisma wave
🤨
jovial warren
why u no embed
multiplication = 1.18ms
bit shifting = 1.22us (micro seconds?)
almost 1000x faster
prisma wave
Oh god that's barely even a microbenchmark
jovial warren
that difference may not seem like much, but when that calculation is being performed at least 3 times every time a player moves, that will make a difference
prisma wave
those results aren't gonna be remotely accurate
jovial warren
at scale, that's the difference between lag and no lag
jovial warren
those results aren't gonna be remotely accurate
no, they're not, but it's still a significant enough difference that it's worth using it
and they produce the same results
any optimisation I can get with a packet that you can receive thousands of every second is a good one
jovial warren
well I can try it out with the new algorithm can't I
and see if it actually makes a noticeable difference
prisma wave
yeah but please for the love of god don't benchmark stuff like that
jovial warren
don't benchmark what?
prisma wave
anything
old wyvern
He means not to benchmark things in the way that you did, not to not benchmark stuff
prisma wave
^^
jovial warren
ah right
is there something wrong with measureTime? or is it that I'm not factoring in all the other stuff?
prisma wave
is there something wrong with measureTime? or is it that I'm not factoring in al...
the latter
old wyvern
You need to take averages of multiple runs and account for cold start ig
prisma wave
^
idk much about benchmarking but if you want accurate results you should probably use something like jmh
jovial warren
I gotta factor in the list filtering as well
that's probably the most expensive thing here
old wyvern
wdym?
jovial warren
isn't filtering done linearly?
it has to linear search, comparing every item to the given predicate, and then remove any items that don't match it
old wyvern
Yes obviously, whats the issue with that?
jovial warren
linear search is O(n) on the worst case
old wyvern
also if you have chains of these sequence operations kotlin does optimize it to a single loop I think
old wyvern
linear search is O(n) on the worst case
Its not a linear search
jovial warren
and in our case, it's always O(n) isn't it?
old wyvern
It is linear time in execution but not linear search
prisma wave
the entire operation will run in linear time
jovial warren
since it always has to run through all the elements
old wyvern
linear search reffers to searching for a particular element in an iteration
jovial warren
true
okay idk whether I'm doing something wrong here, but I've just used measureTime on two separate operations: ```kotlin
TEST_LIST.filter { it != 2 }
TEST_LIST.asSequence().filter { it != 2 }
this is a set of the numbers 1-6
prisma wave
literally none of these results are reliable
jovial warren
yeah they vary so much
and the multiplication time seems to now have magically gone down to micro seconds and nano seconds now wtf
jovial warren
yeah but before it was milliseconds and micro seconds
by adding these two, the other times have now decreased
jovial warren
what is a microbenchmark?
prisma wave
it's not a benchmark
pure arrow
how can i get the number of items/string size of a itemstack
old wyvern
okay idk whether I'm doing something wrong here, but I've just used `measureTime...
Also the second one isnt actually doing anything here
prisma wave
Some common traps in Java micro-benchmarks are:
writing code that the compiler can deduce does not useful work, and therefore optimize away entirely,
not taking account of the "lumpy" nature of Java memory management, and
not taking account of JVM startup effects; e.g. the time take to load and JIT compile classes, and (conversely) the execution speedup that happens once the methods have been JIT compiled.
jovial warren
ah right
jovial warren
Also the second one isnt actually doing anything here
wdym?
lunar cypress
Lazy
prisma wave
^^
old wyvern
There is no terminal operation there xD
jovial warren
forEach?
lunar cypress
No not take
lunar cypress
Any reduction
jovial warren
what if my case never has any of those?
prisma wave
then nothing will happen
jovial warren
I filter and throw it into forEach
prisma wave
forEach is terminal
old wyvern
forEach is terminal
prisma wave
lol
old wyvern
xD
jovial warren
ah
using println(it) in a forEach on both still seems to have sequences measured slower, not 100% sure if I trust measureTime though
prisma wave
because you shouldn't
jovial warren
where do sequences generally perform better btw?
jovial warren
so if I only have one filter followed by a foreach, then sequences aren't really of use to me
prisma wave
they might perform better
hard to say without an actual benchmark
they probably would if the dataset is big
otherwise it's probably not noticable
jovial warren
is converting to sequences expensive though?
prisma wave
not particularly
jovial warren
depends how it does it I suppose
kinda wanna see how Mojang does it, out of curiosity lol
yeah it does a lot more than this lol
also, seems like the bit shift method broke positioning lol
just reverted back to the method from wiki.vg and it works fine again, with bit shifting it sometimes works and sometimes doesn't
player's heads don't move in the yaw axis yet though, which is frustrating because I believe that may be a separate packet
yeah it is
old wyvern
@prisma wave arrays from python's array module are dynamic arrays right?
prisma wave
afaik
old wyvern
alrighty
hot hull
Yugi, I played around with the game engine a tad, pretty cool
jovial warren
anyone wanna help test this btw?
hot hull
Goddamn you Bardy, just closed mc
jovial warren
MineKraft 0.5 xD
hot hull
Gimme a sec
old wyvern
Yugi, I played around with the game engine a tad, pretty cool
nice
hot hull
I'm gonna start from scratch, cause structure fucked again lmao
jovial warren
also, @prisma wave, another reason why I'd rather not have a 33 MB jar is because it takes me like 30 seconds to upload to my server via SFTP every time lol
prisma wave
build on the server
jovial warren
may not be such a bad idea
also, gotta handle disconnects at some point, since atm, you can reconnect and there will be two of you
hot hull
Bardy inception
jovial warren
kek
jovial warren
yeah ik lol
hot hull
I need my hat
jovial warren
metadata defaults are false for everything
not 100% sure why you can't see your own skin stuff though
jovial warren
yeah
hot hull
Also no cape, sadge
jovial warren
not sure if it's metadata or something
stuck harbor
sneeze imagine having a test server
hot hull
Imagine not having a test dedi
stuck harbor
if it compiles, it works on my machine™️
hot hull
Mine is cause I speshul
jovial warren
I got a dedi for testing on the server I'm head dev for, but that's for use with that server only
hot hull
Mine :hopefully:
jovial warren
if it gens worlds like vanilla then sure
hot hull
Will have a vanilla styled world preset as well yea
Some day™️
Got 1 week of vacation, gonna see if I can get the current shit working by the end of the week
jovial warren
also, trying to think of how to fix the repeated code I currently have
since I have 3 different methods
hot hull
Show
jovial warren
one for handling the position packet, one for handling the rotation packet, and one for handling both the position and the rotation
jovial warren
stuck harbor
https://paste.helpch.at/equjoturey.cs
man kotlin
jovial warren
actually that reminds me that I gotta extract the whacky algorithm to a function
hot hull
Why not have the handles return the built packet, and then handling it from there
jovial warren
you mean handling them by combining them into a PPAR packet?
hot hull
I don't know what I mean honestly
jovial warren
lol
stuck harbor
Kotlin trash
- BomBardyGamer, Feburary 2021
also, btw, if you're wondering what an Angle is, it's basically an unsigned byte that represents an angle measured in 256ths of a full turn
using UByte because using Byte was a bit whack sometimes
e.g. making a Byte of value 128 would give you a Byte with value -128, which meant that both those values would produce the same result
with UByte, we don't worry about any of that whack, since there are no negatives
prisma wave
Kotlin trash
jovial warren
literally just ```kotlin
/**
-
Represents a protocol angle, measured in 256ths of a full turn
*/
data class Angle(val value: UByte) : Comparable<Angle> {override operator fun compareTo(other: Angle) = if (value == other.value) 0 else if (value < other.value) -1 else 1
fun toDegrees() = ((value.toFloat() / 256.0f) * 360.0f)
}
fun Float.toAngle() = Angle(((this / 360.0f) * 256.0f).toInt().toUByte())
prisma wave
Inline class you coward
jovial warren
difference?
prisma wave
Fast
jovial warren
never used an inline class before
ah, so it allows you to wrap values without having to actually wrap them at runtime
it doesn't actually create any instances of the wrapper class
prisma wave
the closest thing kotlin has to structs
jovial warren
what even are structs?
jovial warren
also, how are Java's inline classes different?
jovial warren
ah right
old wyvern
Java doesnt have inline classes yet tho right?
jovial warren
has Kotlin not quite made them native yet or what?
old wyvern
part of valhalla I think
jovial warren
ah yeah, it is
hot hull
Kotlin trash
The hell is going on
old wyvern
Haskell gang 
jovial warren
I kinda really wanna see if I can optimise that toAngle algorithm, since division slow lol
prisma wave
has Kotlin not quite made them native yet or what?
They can't be native if the JVM doesn't support them
jovial warren
but I'm not going to bother yet
old wyvern
ah
prisma wave
The hell is going on
I have discovered more modern and performant languages
lunar cypress
They can't be native if the JVM doesn't support them
Yes they can and in kotlins case they are
hot hull
Took you long enough
lunar cypress
They simply don't exist after compilation
jovial warren
^
old wyvern
The wrapper classes still exist in some cases I think
jovial warren
for nullables they do
but for non-null, nope
poof
gone
not 100% sure if it applies for unsigned types though
according to Kotlin bytecode, it still seems to exist though
old wyvern
Also generics
prisma wave
Yes they can and in kotlins case they are
True but I wouldn't say they're "native" , in the same way that top level properties, reified generics, etc aren't native
They aren't actually supported on the JVM, it's just a compiler trick
jovial warren
toAngle seems to return a byte though, instead of the wrapper class
so they must vanish I guess
lunar cypress
Usually when talking about this I focus on the language level
old wyvern
They aren't actually supported on the JVM, it's just a compiler trick
The entirety of kotlin xD
lunar cypress
Because I don't really care about implementation detail
jovial warren
unsigned types are definitely a hack
prisma wave
But in comparison to Java's implementation they're not "native" in the same way
old wyvern
^
jovial warren
When I saw `toAngle` 👀
trust me, it's not a standardised angle lol
it's measured in 256ths of a full turn
lunar cypress
Because if you looked at implementation level there would be no differences between jvm languages whatsoever
jovial warren
likely to save space by keeping it within a single byte
lunar cypress
They'd all have the same feature set by that logic
old wyvern
john, have you used numpy's arrays?
jovial warren
it is funny how Mojang cares much more about the server's outbound packets than the client's
lunar cypress
I have not
jovial warren
since the client always sends absolute positions and degree angles
jovial warren
it's your job to calculate the relative positioning and convert to what I'm going to call "protocol angles"
regal gale
All of a sudden I am interested in using ASM bytecode manipulation... without knowing anything at all
jovial warren
lol
prisma wave
ASM is cool
old wyvern
All of a sudden I am interested in using ASM bytecode manipulation... without kn...
Nice, maybe you should contribute to some port of asm thats in works 🥲
A certain specific port
jovial warren
he means https://github.com/ElaraLang/asm
okay, idk whether it's just me, but I seem to be able to tell an ever so slight difference between using an inline class and a data class for the angle, being that head movements seem to be ever so slightly faster and more precise
and so, in that case, BM, you have now been promoted to God++
old wyvern
Where?
regal gale
old wyvern
Do mean that there is another one?
jovial warren
that's the Java one lol
old wyvern
Yea thats on the jvm
regal gale
I was focused on that lol
jovial warren
they want to be able to read JVM bytecode from Go lol
old wyvern
write*
prisma wave
okay, idk whether it's just me, but I seem to be able to tell an ever so slight ...
I don't see how there could be a difference
old wyvern
and read too Ig
prisma wave
Manipulate
jovial warren
I don't see how there could be a difference
idfk, it is extremely subtle
may just be me
MineKraft 0.6 is now a thing
because I now know how to space out commits a bit better lol
old wyvern
Wasnt it 0.4 like an hour ago
jovial warren
0.5 yeah
0.5 yesterday
also, me.bristermitten.minekraft.entity.cardinal, what a package xD
old wyvern
Alrighty
jovial warren
I added support for player rotation and player position & rotation
right, now what next?
hot hull
skins pl0x
old wyvern
btw frost the components got built. Started building the frost frame
hot hull
Neato
I thought I had some Carrier Prime relics but I don't
Was gonna farm you a set so it picks shit up for you
old wyvern
o.o
hot hull
You got 100k credits by any chance?
old wyvern
Its not an assignment from uni welp, part of the codechef chapter's work
hot hull
ah
old wyvern
🥲
hot hull
Imma go fuck around with this rendering I guess
jovial warren
what is this for?
jovial warren
@hot hull figured out why skins aren't showing lel
you gotta send a metadata packet with the skin settings sent in client settings
this sneaky mother fucker
jovial warren
not yet, working on it now lol
anyone got any idea if there's an easy way to split an unsigned byte into 8 booleans?
hot hull
wow that's dumb, why does groovy not allow variables in
plugins {
}
limitations
hot hull
lame
jovial warren
fun fromProtocol(byte: UByte): SkinFlags {
val int = byte.toUInt()
return SkinFlags(
(int and 0x01u) != 0u,
(int and 0x02u) != 0u,
(int and 0x04u) != 0u,
(int and 0x08u) != 0u,
(int and 0x10u) != 0u,
(int and 0x20u) != 0u,
(int and 0x40u) != 0u
)
}
```that should work I thinkand I gotta convert to an int there because otherwise you get some whack where 0x01u and 0u are UInts
you can't define bytes like that for whatever reason
heady birch
(int.toInt() & 0x01) != 0?
jovial warren
yeah that might work, but isn't that a bit wasteful?
heady birch
What with the .toInt() ? I'm not sure how kotlin handles it
jovial warren
actually what am I on about
that'll just get yeeted after it's done
oh also, if I have more than one predicate, is it best to call filter twice or just use &&?
lunar cypress
if it is a sequence it does not matter
jovial warren
it's currently just using the collection method
lunar cypress
do you need a filtered collection?
jovial warren
I need to just filter a collection and iterate over it's elements
lunar cypress
so you don't
jovial warren
probably best to make it a sequence and call filter twice then right?
lunar cypress
every transformation on a collection is O(n) space complexity
so if you only use one filter you save a factor of two
sequences should be O(1) space
lunar cypress
space
jovial warren
ah right
so space complexity is the amount of space it requires then?
and then time complexity is how long it takes
lunar cypress
time complexity is O(n) in both cases but in contrast to collections multiple transformations on sequences do not factor the steps
jovial warren
what's conversion to sequences like?
lunar cypress
should be O(1)
jovial warren
time complexity?
lunar cypress
both time and space
jovial warren
right then, sequences it is
lunar cypress
but I'd have to double check that
old wyvern
yes, It only exists for the compiler in most cases
lunar cypress
note that this does not say anything about how long this takes in seconds or similar
old wyvern
its simplified into a single loop
jovial warren
asSequence just returns Sequence { this.iterator() }
lunar cypress
yeah that's constant
jovial warren
so O(1) right?
jovial warren
yeah
lunar cypress
and even though technically both sequences and collections end up with O(n) in time as long as you're doing a constant amount of transformations, sequences are still better in practice because you still reduce the amount of steps by that constant factor
jovial warren
yeah
remote goblet
So how fast is while(true)
jovial warren
O(∞)
jovial warren
doesn't have a time complexity because it's infinite right?
old wyvern
Wouldnt it be 1 since there is no external input that affects the execution?
lunar cypress
if it doesn't halt at all you can't determine the max. number of steps it takes until it halts
no function grows asymptotically faster than infinity because there is no such thing as a function from N -> N that "reaches" infinity
or to put it in another way it doesn't make sense to define the "growth" of infinity
jovial warren
if I'm only performing a single operation, e.g. filter, followed by map for example, then it's not worth using sequences for that right?
old wyvern
Wouldnt the growth of infinity be no growth at all tho
lunar cypress
no because infinity is not a constant or a number that abides by any of our rules for natural numbers
lunar cypress
Maybe someone defined it differently idk, but to me it does not make sense to define
lunar cypress
if I'm only performing a single operation, e.g. `filter`, followed by `map` for ...
filter, then map, then some terminal operation is not a single operation
it always depends
jovial warren
no it just does filter then map
lunar cypress
do you want it as a collection in the end? then for two operations I'd probably do it without a sequence, yeah
although it wouldn't hurt
and is still technically better because you save a factor of 2 in space
lunar cypress
keep in mind that with small input lengths factors like that don't really matter all that much
jovial warren
right, I need a bit of help figuring something out
you see https://github.com/knightzmc/MineKraft/blob/master/src/main/kotlin/me/bristermitten/minekraft/entity/metadata/EntityMetadata.kt right?
those all have defaults set
now, my issue is that I need both the defaults, but also a way to recognise if we just want to send a single part, or only parts of the metadata, and not the full monty
I would do this by making them nullable with a default of null, but then how would you tell the difference between optional metadata and other metadata?
e.g. you can send a packet with only 2 out of all the metadata values with no issues, but you also have required and optional metadata, where the difference is that the former must be present and non-null if you choose to send it, whereas the latter you have to send a boolean value indicating whether it's present or not
lunar cypress
that's the issue with place oriented programming 
jovial warren
with what?
old wyvern
prisma wave
richard 🤤
jovial warren
yeah I'm reading the transcript rn
well that kinda went right over my head
so it's kinda where you have addresses and you can free and allocate those addresses and put and replace things there right?
that's what he's talking about
hot hull
Ah yes when you use minecraft as a perlin noise representation :p http://adrianb.io/2014/08/09/perlinnoise.html
jovial warren
anyone got any ideas of possible solutions to my issue?
jovial warren
Ah yes when you use minecraft as a perlin noise representation :p http://adrianb...
I mean, not a bad idea, Minecraft's perlin noise is pretty good
hot hull
Yea it's really good
Could be better with some polishing, but for a blocky game it's pretty decent
wind patio
any linux/unix users here?
jovial warren
which kinda unix?
forest pecan
unix 🤮
jovial warren
Linux is unix-like, but yeah
forest pecan
linux > unix
jovial warren
so you want bash support, not unix support
wind patio
can user linadoma write to the directory xz?
jovial warren
yes
wind patio
then wtf is wrong with my lecturers
jovial warren
let me break down those permissions
first, we have d, which indicates this is a directory
wind patio
yeah, I mean, I understand it, but,
jovial warren
then, we have the first rwx, which indicates the read, write and execute flags for the user who owns this
jovial warren
then, we have the second rwx, which indicates the read, write and execute flags for the group of the user who owns this
then the third and final set of rwx flags indicate the permissions of other, basically everyone else
regal gale
Thanks mojang api for letting me know the actual reason how our MC uuid randomize between Alex and Steve 👀
jovial warren
in this case, linadoma can read and write, users can read and execute, and everyone else can read and execute
wind patio
yeah, knew most of it, thanks for further explanation though
hot hull
Should I be generating the permutation table myself, or should I just be using existing patterns?
jovial warren
yeah, knew most of it, thanks for further explanation though
yw
thinking of having required fields be nullable and optionals using Java's Optional
bit ew but it'll work
lunar cypress
so it's kinda where you have addresses and you can free and allocate those addre...
I don't think what I mean is mentioned in that talk. What I mean is the concept of representing data that is not present as null (because you have to put something in its place) rather than just omitting whatever is not present
lunar cypress
This is hard to do in a statically typed language and Kotlin doesn't have a solution for this
You have to work your way around it somehow
But I wouldn't use Optional
rather wrap it yourself somehow
jovial warren
I could just make my own optional yeah
since the problem with optional is it just sets null values to empty
I need an optional that can have 3 states: present and non-null, present and null, or not present
lunar cypress
sealed class
jovial warren
sealed class Optional<T>
object EmptyOptional : Optional<*>
object NullOptional : Optional<Nothing?>
class PresentOptional<T>(val value: T) : Optional<T>
```?probably a better way to do that
heady birch
jovial warren
heady birch
https://www.youtube.com/watch?v=K7Hn1rPQouU
Imagine how much better the world would be if you could see the % until a breach
prisma wave
Maybe IO List String
jovial warren
sealed class Optional<T>
object EmptyOptional : Optional<Unit>()
object NullOptional : Optional<Nothing?>()
class PresentOptional<T>(val value: T) : Optional<T>()
```or maybe thisusing unit there seems like a bit of a hack though
heady birch
Could you not just use null? Since kotlins null safety stuff im pretty sure isn't zero cost like rust
jovial warren
let me explain why null won't work
prisma wave
it's pretty much zero cost
prisma wave
but there is a cost because of interop
jovial warren
I need to represent when we don't want to send the metadata value, when we want to send a required metadata value (one that must not be null and is not prefixed with a boolean), and when we want to send an optional metadata value (one that needs to be prefixed with a boolean stating whether it's present or not)
forest pecan
hot hull
No u
heady birch
enum Metadata<T> {
Required {
value: [T]
},
Optional {
value: Option<[T]>
}
}
lunar cypress
if that's supposed to be rust idk why you put square brackets there
heady birch
Surprisingly, I have never done generics (in rust), I just put together what I remembered, obviously remembered it wrong lol
lunar cypress
enum Metadata<T> {
Required(T),
Optional(Option<T>),
}```I've thought of a hack that will work for this lol
what if I use Java's Optional, but I have not only the optional's value be nullable, but also the optional itself
wind patio
yw
well, I wrote the email to the lecturer
he still says you can't write a file to it since you don't have execute permission
lunar cypress
what if I use Java's `Optional`, but I have not only the optional's value be nul...
no, bad
lunar cypress
it violates the contract of optional and is worse than making a sealed class in every regard
wind patio
you can write to a file, you just can't execute it
but I can't create file there, correct?
lunar cypress
and better than doing whacky casting
whacky casting? what?
jovial warren
like having to cast x to y
prisma wave
Pattern matching🙂
lunar cypress
and what do you think will you do with optionals? not null check, get, map or whatever?
you can implement the same operations on your custom wrapper
jovial warren
if optional not null, write optional metadata
wind patio
you just can't execute it
could it vary on OS?
lunar cypress
if optional not null, write optional metadata
ok how is this better than casting (ignoring that this violates the purpose of Optional, again)
jovial warren
because we'd have to check if it's not an instance of NullOptional and then cast to PresentOptional if it's not
lunar cypress
no
jovial warren
actually I suppose that's not bad
jovial warren
```rust
enum Metadata<T> {
Required(T),
Optional(Option<T>),
}```
wat dis?
right, if in doubt, bring the notchian server out
prisma wave
rust enums
jovial warren
public static class DataItem<T> {
private final EntityDataAccessor<T> accessor;
private T value;
private boolean dirty;
public DataItem(EntityDataAccessor<T> param_0, T param_1) {
this.accessor = param_0;
this.value = param_1;
this.dirty = true;
}
public EntityDataAccessor<T> getAccessor() {
return this.accessor;
}
public void setValue(T param_0) {
this.value = param_0;
}
public T getValue() {
return this.value;
}
public boolean isDirty() {
return this.dirty;
}
public void setDirty(boolean param_0) {
this.dirty = param_0;
}
public DataItem<T> copy() {
return new DataItem<T>(this.accessor, this.accessor.getSerializer().copy(this.value));
}
}
sends a list of those
lunar cypress
first of all, using the official server as a style guide is not a good idea
jovial warren
yeah ik
I just wanted to see what it did
CrudeIncrementalIntIdentityHashBiMap very nice
okay yeah, it has a serialiser per type
so it has a different EntityDataSerializer implementation for each of the 19 different types
I mean, I should kinda just have this be a list
instead of wrapping it all in horrible looking classes
lunar cypress
But the point of this is to make an abstraction
it's supposed to represent an object
If you're writing to the protocol directly you might as well ask why bother doing anything other than just raw bytes
forest pecan
DeluxeConcurrentAsyncAbstractTreeCrudeIncrementalIntIdentityHashBiMapImpl
jovial warren
If you're writing to the protocol directly you might as well ask why bother doin...
wdym writing directly?
also, stuff like this shouldn't really be wrapped in classes anyway
since there's just so many metadata flags that will just be repeated in every subclass
and it's not like I have to read this anyway
I just write it all and send it off
also gives me an excuse to use generics 🙂
lunar cypress
anyway, just to give an example of what I recommended earlier
sealed class Metadata<T> {
abstract val value: T?
}
class Required<T>(override val value: T) : Metadata<T>()
class Optional<T>(override val value: T?) : Metadata<T>()```not bad
prisma wave
data Metadata t
jovial warren
wat?
lunar cypress
circlejerk all you want, the real problem behind this is only fixed by something like Clojure
prisma wave
🤣
lunar cypress
where you just use a map and omission
prisma wave
nil
Dear clojure users
You claim to fix many programming problems, and yet a function in Clojure cannot be guaranteed to be pure
Curious...
lunar cypress
dear haskell users
you claim to have a rich type system, yet you encode every little problem as an own type, distracting from the actual types of your program
jovial warren
actually my solution kinda runs into the same issue lol
unless I do what Mojang did
fuck it, Johnny, I'm using your solution
prisma wave
Dear clojure users
You claim types are bad, yet you spend hours debugging vague errors that a statically typed compiler could check within milliseconds
old wyvern
😌
obtuse gale
Dear programmer:
You suck
Go fuck yourself
jovial warren
this is actually kinda nice ngl Johnny
one question though
how can I deal with knowing whether the user wants to give it a value or sending nothing at all?
just use Required? for example?
lunar cypress
oh uh
you could either make this nullable, or, probably better, add a third "empty" type
But currently it should already support everything hold on
oh no it doesn't, right
yeah it'd need a third variant
jovial warren
so just ```kotlin
class Empty<T> : Metadata<T>() {
override val value: Nothing? = null
}
wait but optional metadata values can be absent right
wicked raft
can someone help me to why this doesn't work
package me.blazen.starter;
import org.bukkit.Bukkit;
import org.bukkit.event.Event;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.BlockBreakEvent;
import org.bukkit.event.player.PlayerMoveEvent;
public class SpeedA implements Listener {
private double lastDist;
private boolean lastOnGround;
@EventHandler
public void onPlayerMove(PlayerMoveEvent e) {
if (e instanceof PlayerMoveEvent) {
PlayerMoveEvent event = ((PlayerMoveEvent) e);
double distX = event.getTo().getX() - event.getFrom().getX();
double distZ = event.getTo().getZ() - event.getFrom().getZ();
double dist = (distX * distX) + (distZ * distZ);
double lastDist = this.lastDist;
this.lastDist = dist;
boolean onGround = event.getPlayer().isOnGround();
boolean lastOnGround = this.lastOnGround;
this.lastOnGround = onGround;
float friction = 0.91F;
double shiftedLastDist = lastDist * friction;
double equalness = dist - shiftedLastDist;
Bukkit.broadcastMessage(equalness + "");
}
}
}```
I was following a tutorial for some of it but it didnt have all of it so I did the rest on my own but it doesnt broadcast any messages in my server. I am pretty new to coding plugins so I probably messed something up.that would just make it indistinguishable from Optional though
lunar cypress
yeah that's why I'm asking
I suppose I don't really understand what "required" means here
lunar cypress
to me it sounds like you always need to send it
jovial warren
"it is not required to send all metadata fields, or even any metadata fields, so long as the terminating entry is correctly sent"
some of those types in that list though are optional, meaning they can be sent but absent
some of them must be sent if they are present
jovial warren
can someone help me to why this doesn't work
```java
package me.blazen.starter;...
you registered that?
lunar cypress
oh I would take a different approach here
wicked raft
you registered that?
yes
jovial warren
also, what's the purpose of the cast there?
you unnecessarily check if the event is a PlayerMoveEvent, when we already know it's a PlayerMoveEvent because that's the type passed to this method
jovial warren
oh I would take a different approach here
what?
wicked raft
that is true
wicked raft
you unnecessarily check if the event is a `PlayerMoveEvent`, when we already kno...
well for some reason taking out the if statement fixed it
lunar cypress
have nullability represent whether something should be sent or not, i.e. null = do not send
and for optionality use a sealed class
so all of your fields are nullable
jovial warren
that was exactly what I was trying to do lol
lunar cypress
what's the issue you're facing with that?
lunar cypress
then I must have misunderstood you in the beginning
other than the fact that I still wouldn't use java.util.Optional
jovial warren
how can I deal with knowing whether the user wants to give it a value or sending...
.
I suggested using nullable for not sent and a sealed class for optional values
actually, I don't even need a sealed class, I just need a class that wraps a nullable value
jovial warren
also, can someone who knows more about this than me tell me why you can't use a smart cast on an open property?
old wyvern
also, can someone who knows more about this than me tell me why you can't use a ...
Thats not because of the property being open but rather having a variable(var) property afaik. Reason being that they could change even after the check since its mutable and so can be mutated from somewhere else
jovial warren
actually that's not it, but it makes sense now why that occurs
iirc, you can override vals with vars
old wyvern
huh?
jovial warren
or something like that
jovial warren
it has to have something to do with it being able to be overridden with a mutable property
love how I'm complaining now and I haven't even got to the part where most call it quits yet lol
wicked raft
@jovial warren is there a way to broadcast what a variable is ```@EventHandler
public void onPlayerMove(PlayerMoveEvent e) {
PlayerMoveEvent event = ((PlayerMoveEvent) e);
double distX = event.getTo().getX() - event.getFrom().getX();
double distZ = event.getTo().getZ() - event.getFrom().getZ();
double dist = (distX * distX) + (distZ * distZ);
double lastDist = this.lastDist;
this.lastDist = dist;
boolean onGround = event.getPlayer().isOnGround();
boolean lastOnGround = this.lastOnGround;
this.lastOnGround = onGround;
float friction = 0.91F;
double shiftedLastDist = lastDist * friction;
double equalness = dist - shiftedLastDist;
double scaledEqualness = equalness * 138;
if (!onGround && !lastOnGround) {
if (scaledEqualness >= 1.0) {
Bukkit.broadcastMessage(scaledEqualness + "");
}
}
}``` I want to see what onGround and lastOnGround are to see what they are outputting
ok
jovial warren
you can use the logger from your plugin instance
steel heart
jovial warren
yeah there's no need to cast there either
your IDE should flag that up as a redundant cast
he's still learning
give him a break guys
wicked raft
do I not have to do that?
jovial warren
no
wicked raft
oh ok
jovial warren
casting is when you want to turn one object into another
in your case, it's already the object that you're casting to, so there's no point in casting there
just rename your parameter name from e to event and you're good
wicked raft
ok
prisma wave
Hahahaha imagine having casting in your language
Good news everyone
Go 1.16 added unicode 13.0.0 support
Meaning 🥲 is now supported
obtuse gale
🥲
jovial warren
https://i.imgur.com/C78R2JW.png someone explain how @JvmName is not applicable here
prisma wave
It's not applicable
jovial warren
I have to specify @JvmName there to avoid overload resolution ambiguity
jovial warren
It's not applicable
yeah but why?
prisma wave
Probably cuz it's an extension function
jovial warren
but IntelliJ doesn't complain about it, which confuses me
if I decompile the bytecode, I can see it applies it correctly
and I saw a suggestion to use @JvmName to avoid ambiguity there on StackOverflow
forest pecan
ah yes, I can cast door onto door and get door
jovial warren
and it's also the suggestion that the official article about Java interoperability suggests
prisma wave
let writeOptionalMetadata buf index chat =
writeOptionalMetadata :: ByteBuf -> UByte -> Maybe Component -> IO ()
jovial warren
trying to think of my options now
prisma wave
fn writeOptionalMetadata (buf: &ByteBuf, index: u8, chat: Option<Component>)
jovial warren
what are you trying to suggest?
prisma wave
Nothing
old wyvern
That haskell is superior*
prisma wave
Oh yeah that goes without saying
jovial warren
old wyvern
bm
prisma wave
oui?
old wyvern
Can you proof read something I wrote? I wanna make sure not to include any dumb mistakes 😬
prisma wave
Sure
ocean quartz
what are you trying to suggest?
You should know bm by now
prisma wave
😊
jovial warren
true
old wyvern
Alrighty ill dm it to you in 5 mins
frail glade
Good Afternoon smart people.
jovial warren
good afternoon Glare
old wyvern
extend ByteBuf as buf {
let writeOptionalMetadata(Byte index, Result<Component> chat) => {
buf.writeUByte(index)
if index != 0xFF.toUByte() {
buf.writeVarInt(MetaDataType.OPTIONAL_CHAT, id)
buf.writeOptionalChat(chat)
}
}
}
Pancake King
jovial warren
seems to be a Kotlin bug btw, using @Suppress("INAPPLICABLE_JVM_NAME") seems to have fixed it
and skins now work
prisma wave
```rust
extend ByteBuf as buf {
let writeOptionalMetadata(Byte index, Result<C...
Looks great!!!
frail glade
Ooo that's fancy.
hot hull
Coolio
jovial warren
can't see others' skins yet because I'm still working on that, but it's a start
distant sun
Is anybody else having issue with iij not being able to access the source of certain library(libraries)?
jovial warren
MineKraft is now 0.7 🙂
actually not sure if that should've been a patch
yeah I'm making that a patch
frail glade
MineKraft O.o
prisma wave
```rust
extend ByteBuf as buf {
let writeOptionalMetadata(Byte index, Result<C...
Actually we should probably have separate Option and Result types
jovial warren
MineKraft O.o
Minecraft server implementation from scratch in Kotlin 🙂
frail glade
How's that going for ya?
jovial warren
actually pretty well
you can join into a world with a single 16x16x16 cube of stone
you can see other players
frail glade
Ooo
old wyvern
Actually we should probably have separate Option and Result types
true
ocean quartz
MineKraft O.o
frail glade
So what is the benefit of writing a Kotlin implementation for this?
jovial warren
just a fun side project
static zealot
its kotlin xD
jovial warren
also will hopefully multithread properly
frail glade
Could design it to be a lightweight limbo server?
ocean quartz
If done well Coroutines could be a big benefit
jovial warren
If done well Coroutines could be a big benefit
^
old wyvern
HasKraft 🔜
jovial warren
BM's already spoke about changing the name, but no one can come up with any good ideas lol
static zealot
KotlinCraft
distant sun
Kraft
obtuse gale
K-Craft
static zealot
KraftMine
surreal quarry
Kraft - Mac and Cheese
jovial warren
I kinda want a name that doesn't contain any variation on the words "Kotlin", "Craft" or "Mine"
static zealot
Cleo
distant sun
KineMraft
jovial warren
So nothing that actually hints what the project is about
nothing that's really really unoriginal lol
prisma wave
F#Craft
ocean quartz
I kinda want a name that doesn't contain any variation on the words "Kotlin", "C...
Says the person who made "Komponent" lmao
prisma wave
We are announcing the addition of the Zombie monad
jovial warren
Says the person who made "Komponent" lmao
frail glade
So have you done any benchmark testing to see how it runs so far or is it not to that point yet?
jovial warren
I might rename that at some point
jovial warren
So have you done any benchmark testing to see how it runs so far or is it not to...
baby steps Glare, baby steps xD
static zealot
Hector Hughes
jovial warren
you gotta learn to run before you can walk
it hardly functions as a proper Minecraft server yet
also, I will rename Komponent at some point if I come up with a better name
frail glade
Yo website is down bm
static zealot
KraftTheCraft
jovial warren
what did I say
prisma wave
ClojureCraft
jovial warren
I kinda want a name that doesn't contain any variation on the words "Kotlin", "C...
.
frail glade
prev
jovial warren
lol
static zealot
Minebug
Minekitten```where you getting these? GitHub's name generator?
frail glade
jovial warren
I can't go with the naming scheme of that lel
also, that's not his site
that's mine
frail glade
Yo website is down
jovial warren
yeah ik
static zealot
insidious restaurant
jovial warren
I don't even have one lol
frigid badge
static zealot
:doubt:
jovial warren
yeah nothing ever got done with that
ocean quartz
Quality
Someone rewrite this for me lol
jovial warren
look at what that is
also, love how that email address doesn't exist any more either
the only Prevarinite emails I have are my personal one, abuse, admin and reports
I would revive Prevarinite again, if the members wanted to stick around as well lol
prisma wave
Yo website is down
Oh that's not mine
jovial warren
also, the naming for that was just "Prevaricate" (my favourite word at the time), and a bit of manipulation, I think from the word "Ignite", which came from a previous project of mine, "Inferno"
love how because we're all developers, none of us are good at naming things lol
old wyvern
Nah man, it has anything to do with kotlin, we gotta sneak in that K somehow
jovial warren
I mean, I personally would be happy to settle on MineKraft, but BM doesn't like it
old wyvern
Kongress
surreal quarry
Krap
jovial warren
also, if you're talking about naming relating to other things, Spigot and Paper for example are two names of projects that have nothing to do with what they're named after
jovial warren
no
jovial warren
oh come on, at least someone here has to be half decent at naming
static zealot
double-text
prisma wave
Rust
jovial warren
@obtuse gale another good example
prisma wave
Name it after someone famous
old wyvern
also, if you're talking about naming relating to other things, Spigot and Paper ...
Needs to be renamed
We need SpiJot nad Japer
jovial warren
I was thinking of naming it after an element on the periodic table
obtuse gale
Name it after someone famous
Will Smith
old wyvern
or Pajer
static zealot
PopularGameThatIsPopularAndStartsWithMineAndEndsWithCraftWrittenInKotlin
old wyvern
idk
prisma wave
Name it after someone like famous mathematician Haskell Curry
jovial warren
no
static zealot
CurryKraft
obtuse gale
Samuel L Jackson
prisma wave
Samuel L Jackson
Jackson🥲
jovial warren
how about Oxide?
static zealot
Dioxide
old wyvern
How about Peroxide?
prisma wave
Michael Jacksoncraft
prisma wave
Popular Minecraft server implementation "Joe Biden"
jovial warren
Ammonium
obtuse gale
Robin Williams
old wyvern
Or Sodium Bicarbonate Or Benzene-2-4-Dialdehyde
obtuse gale
Bryan Adams
prisma wave
What about something that describes the game
obtuse gale
Minecraft
old wyvern
Make a Cubic shaped carbon chain and name it its IUPAC name
prisma wave
Like CraftMine or Minecraft or something
jovial warren
way too unoriginal
prisma wave
🥲
jovial warren
come on guys
prisma wave
way too unoriginal
What?
heady birch
KotlinCraft
obtuse gale
Lorem Ipsum
jovial warren
Lanthanide
prisma wave
Intellectual Property Craft
stuck harbor
lol
surreal quarry
static zealot
MineHQCraft
old wyvern
Dolor sit amet
jovial warren
ffs guys, can't we just be at least somewhat serious for once in our lives
surreal quarry
IronOre
static zealot
BoulderKraft
heady birch
GoldenAppleMC
static zealot
CopperKraft
surreal quarry
GoogleKraft
jovial warren
I'm spitting out names and everyone's just ignoring them
old wyvern
FUNCraft
jovial warren
Nitride
prisma wave
Copper Wire 0.35mm Enamelled Copper Magnet Wire Round Copper Wiring Bare Copper Wire for Transformer Inductor Coil Relay Motor Coil Winding
surreal quarry
AmericaKraft
jovial warren
why do I bother asking you lot, honestly
static zealot
DigBuild
prisma wave
RepublicanCraft
static zealot
DrillKraft
jovial warren
please just be serious for once
surreal quarry
ChinaJoeBiden'sSonCraft
jovial warren
fucking hell
prisma wave
SleepyJoeCraft
obtuse gale
Queen Elizabeth the First of England
surreal quarry
Craft™️
obtuse gale
^
prisma wave
CraftCraft
static zealot
IngotCraft
heady birch
MineKT ? Or something
jovial warren
at this point, I'm just gonna pick the name
old wyvern
obtuse gale
ocean quartz
Lmao
old wyvern
xD
static zealot
OpenPitMiningKraft
prisma wave
<#695431668944732270>
Not configuration help
old wyvern
When they said carbon makes up life, they werent kidding
heady birch
PluginnerMc
surreal quarry
RavineKraft
ocean quartz
NotJavaCraft
prisma wave
AmongusCraft
jovial warren
right, let's do some ratings
static zealot
ProspectingLicenceKraft
old wyvern
ElaraCraft
ocean quartz
HasKraft
jovial warren
I'm gonna throw names, and you guys can rate them
static zealot
SedimentaryRockKraft
surreal quarry
fuck
old wyvern
I'm gonna throw names, and you guys can rate them
Does it start with Elara?
jovial warren
Oxygen
prisma wave
Elaramooncraft
old wyvern
If not, its a -1 from me
prisma wave
Me too
static zealot
ELARAELARAELARAELARAKRAFTELARA
surreal quarry
CarbonDioxideKraftImplementationFactoryGenerator
jovial warren
that's the name of a UK mobile phone company lol
prisma wave
H2O2
static zealot
ZeusKraft
lunar cypress
H1N1
prisma wave
Mineplex
surreal quarry
O(x^x)
ocean quartz
Ozone 😮
forest pecan
O(N!!)
static zealot
OrthosieKraft
forest pecan
O(N!!!!!^N!!!!!)
prisma wave
Simon Peyton-Jones craft
prisma wave
Hickeycraft
static zealot
ThrymrKraft
ocean quartz
sounds like it's been done many, many times before
Was referring to Yugi's message xD
forest pecan
Blitzcraft
jovial warren
I'm losing hope in you lot
old wyvern
WHAT!
forest pecan
LMAO
static zealot
BlitzKraft 💯
obtuse gale
No need to shout
old wyvern
Barry!!
surreal quarry
Why are we ruling out AmericaKraft?
lunar cypress
I'm losing hope in you lot
we're just collectively going insane.
prisma wave
BarryCraft
static zealot
UranusCraft
jovial warren
you're all useless, I swear
prisma wave
🥲
obtuse gale
SARS-Cov-2 Craft
Kovid
prisma wave
🥲craft
ocean quartz
Omg
static zealot
:smiling_face_with_3_tears: craft
surreal quarry
Kovid i love it
old wyvern
God dammot
forest pecan
🙂
prisma wave
smiling_face_with_minecraft_server_implementation
jovial warren
everyone just stop
ocean quartz
Unironically would use Kovid
obtuse gale
XD
static zealot
S/2003 J9 Kraft
jovial warren
that's enough names
forest pecan
that's enough names
n o
prisma wave
Pogchampcraft
old wyvern
KoviShield
surreal quarry
ChessKraft
static zealot
NixKraft
old wyvern
KKK
forest pecan
WeirdChampKraft
jovial warren
you're just taking the piss at this point
obtuse gale
FlexTapeCraft
prisma wave
T-Mobile Craft
Vodafonecraft
ocean quartz
LiquidDryWallCraft
surreal quarry
Kraft-beta-rc-alpha-00.1 v0.0.1-Beta
static zealot
Margaret Craft
obtuse gale
-SNAPSHOT
static zealot
KovlinCraft