The Nineteenth Byte

Anush

21:01

If people like it I could pose it as a challenge tomorrow

Python has random.choices already which takes weights

Adám

@Anush APL: {?0}⍸⍨+\÷+/ Try it online!

ngn

@Anush tbh, i don't think it's particularly interesting

Anush

@Adám works with floats too!

@ngn how come?

ngn

@Anush too trivial

Anush

The alias method is pretty cool

@Adám how does it work?

@ngn is it really easy in C?

ngn

21:05

@Adám can you use multiplication instead of division and get rid of the swap?

Anush

@ngn you made my hard combinatorics challenge look trivial! :)

ngn

@Anush i don't see why it would be hard

Adám

@Anush +/ sums the weights and +\ is the cumulative sums. So dividing the cumulative sums by the sum normalises the values to be in the range (0,1] then {?0} generates a random value in the range (0,1) and ⍸ finds which interval the random value belongs in.

Anush

@ngn you can make a cumulative sum array and then do binary search

ngn

@Anush i didn't make it so, i was just the first to discover that fact :)

Anush

21:07

@ngn :)

Adám

@Anush Yes, that :-)

Anush

@Adám very nice

Adám

@ngn I can: +\⍸{?0}×+/ May be more efficient too :-)

Sandbox Posts

0

A: Sandbox for Proposed Challenges

Yes. Me again. However, I have an idea for a king-of-the-hill challenge. It is... Create a self-replicating program! (Subject to a few rules) Background You are a programmer who has been requested to create a self replicating program that wipes out other self-rep programs. However, you need to ha...

Anush

Got to have binary search in there!

ngn

21:10

@Adám what is []io there? (trick question)

Adám

@ngn 1 but the result is 0-indexed. Some think that ⍸ should not be ⎕IO-dependent.

qwr

21:25

I've always wanted to create my own language. Anyone got any tips

btw @Giuseppe did you see this codegolf.stackexchange.com/a/226269/17360

new function notation for R that makes short functions so much shorter

Unrelated String

@qwr get your core ideas laid out then work it out from there

Adám

@qwr First, decide what kind of language, and what implementation language you'll use.

Unrelated String

maybe i'm not one to talk

qwr

the idea was always a Piet knockoff

lol

Unrelated String

lol

Adám

21:30

So a 2D language? (The fact that you store/represent the program as a picture doesn't really matter.)

qwr

I guess, but idk if there is anything unique to piet that makes the programs appear like actual Mondrain paintings

from what I can tell, many Piet programs don't look like Mondrains

Unrelated String

well, you could think of how to enforce that then

qwr

oh yeah i remembered i joined the esolangs discord

i already forgot I did

bad memory

Unrelated String

lol

qwr

I don't use js but I've been learning it for work and the arrow function notation is nice

Adám

21:39

@qwr What programming languages do you use?

qwr

python mostly

and R

for code golf sometimes I'll waste a lot of time writing assembly

Adám

@qwr Maybe if instead the operation was determined both by the current block's contiguous size (and a restriction that it has to be rectangular) and its specific colour (from a fixed palette)…

qwr

R is an underrated language for code golf I think because a lot of builtins are already vectorized

Adám

APL is an underrated language because all builtins are already vectorized.

ngn

apl sales pitch coming any second :)

Adám

21:42

@ngn Ha! You're too slow.

qwr

R also has interesting "pipe" syntax, but it's not any shorter than writing functions normally

Unrelated String

let me guess, |>

Adám

APL doesn't need a syntax for piping. Simply putting functions next to each other makes each function take the previous one's result as its argument.

qwr

well R is a funny language because Hadley Wickham and co have developed a set of libraries so widely used they're basically a dialect of R now

so piping was introduced as a very weird syntax %>%

there's even weirder syntax like %$% and %<>%

%<>% is an assignment pipe which does a pipe and assignment

Unrelated String

as in... it tees an intermediate pipe result to a variable?

qwr

21:50

there's also a tee pipe %T>%

they actually used the letter t

Unrelated String

of course

qwr

the assignment pipe is like foo <- foo %>% bar is written as foo %<>% bar

there's also right assignment like x-> y because why not

rak1507

and I thought haskell had weird operators!

qwr

people rarely use them

all the weird pipes I listed are not in base R

Unrelated String

so %<>% is basically what you'd think would be %>%=

qwr

21:54

yeah but R is janky so it has two assignment operators, <- and =

(and ->)

Unrelated String

of course

qwr

base R has a whole swath of deprecated functions that came from S

I wonder if I can cheat in a code golf answer and say my language is R + tidyverse

and then not import the package

speaky of janky functions, I found out print in javascript will send the current page to the printer

of course

Adám

@qwr Yes, you can. Not called cheating.

user

22:40

Hi @lyxal

Got any more cursed Java code?

lyxal

Ask hyper

They know

user

@hyper-neutrino Pinging you because I'm annoying

Got any nice cursed Java code?

lyxal

23:24

@hyper-neutrino Y u no give user a sample of cursed Java?

Smh making me do things myself

it actually is cursed. cropping it in paint made my computer screen go black for a bit

@user

@RedwolfPrograms jokes on you because i was sleeping when you posted that

hyper-neutrino

@lyxal apologies, I had to go provide sustenance to my mortal vessel

also that java code is especially cursed because the last close brace is not indented properly

fix right now or i will go over to your house and arrest you for cursedness

lyxal

ight fine it's fixed

hyper-neutrino

also whose code are you calling cursed

>:-(

Redwolf Programs

Moderators do indeed have the power to arrest anyone in any country

lyxal

> haven't tested xd

That you?

also

        pets[0] = new Pet("redwoof", "dog", "medium", 6.0, 15);
        pets[1] = new Pet("razewoof", "dog", "large", 9.0, 19);
        pets[2] = new Pet("browncat", "cat", "small", 3.0, 3);

        petCount = 3;

        doctors[0] = new Doctor("lyxal", "dog");
        doctors[1] = new Doctor("hyper", "cat");

        doctorCount = 2;

hyper-neutrino

23:41

well does it work?

untested != cursed

lyxal

yes

hyper-neutrino

poggers

lyxal

@hyper-neutrino all my other snippets work

yet they are still cursed

and besides,

12 mins ago, by lyxal

it actually is cursed. cropping it in paint made my computer screen go black for a bit

Redwolf Programs

Why's the petCount needed? Doesn't Java have some sort of .length?

hyper-neutrino

@lyxal that is your computer temporarily failing to handle my sheer power

lyxal

23:41

@RedwolfPrograms it does, but there are null objects in the array sometimes

hyper-neutrino

that sounds cursed

lyxal

petCount keeps track of how many assigned pets there are

hyper-neutrino

lemme guess - you're not allowed to use arraylist because assignment?

Redwolf Programs

Does null mess with length?

lyxal

@hyper-neutrino correct

@RedwolfPrograms not the point

hyper-neutrino

23:42

yes because Java is a relatively sane language compared to JS and the .length of an array is just the number of slots it has

lyxal

 pets = new Pet[MAX_PET_COUNT];

hyper-neutrino

not some cursed property that can be directly modified to change the array's elements

lyxal

I already know how many items there are

but I need to know how many assigned items there are

hyper-neutrino

just use an array and each time you need to append an element, make a new one of size N+1 and System.arraycopy the elements over

lyxal

You do know that java arrays have a fixed size right?

@RedwolfPrograms ^

hyper-neutrino

23:43

oh yeah that might've been good to establish earlier

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