The Nineteenth Byte

A username

11:04

@hyper-neutrino Kaddath maybe?

StackMeter

@Ausername @Ausername I found a package - someone clearly did this before me

A username

@Stackmeter Ok good.

@hyper-neutrino And will you ever find out? No.

Lyxal

I second that motion

HN must never find out

StackMeter

@hyper-neutrino so you can't farm badges

there

Huỳnh Trần Khanh

hello I just earned chat privileges nice to meet all of you

AncientSwordRage

11:13

Welcome @HuỳnhTrầnKhanh !

caird coinheringaahing

@Ausername That's a known issue, its why @hyper-neutrino changed their username from HyperNeutrino

Huỳnh Trần Khanh

i want to add this community to my long list of communities I'm in good terms with lol

caird coinheringaahing

@hyper-neutrino No, and because SE is buggy

Huỳnh Trần Khanh

i wanna learn golfing languages where can i get started

AncientSwordRage

@cairdcoinheringaahing what's the issue exactly?

28

Q: Sandbox instructions for new users

We now have a nifty new info-box to point new users to the Sandbox. Hooray! But when a new user does go to the Sandbox for the first time, the instructions there don't give them much to work from to write their Sandboxed challenge. I think the Sandbox post itself is prime real estate for chall...

thats for asking Qs

caird coinheringaahing

11:16

@AncientSwordRage SE typically "cuts off" usernames in chat to fit the screen size. It tries to do that after the first non-letter character, but for some mods (like you, or HyperNeutrino) there isn't a non-space character before the diamond, so it just shows the diamond

AncientSwordRage

@cairdcoinheringaahing oh weird

caird coinheringaahing

@HuỳnhTrầnKhanh What kinda golfing language do you want to learn?

Or, a better question would be, do you have any specific golfing lang you want to learn?

AncientSwordRage

26

Q: Community FAQ for Programming Puzzles & Code Golf

Community FAQ For the Programming Puzzles & Code Golf site For official guidance from Stack Exchange, visit the Help Center. Posting Challenges/Solutions How can I incorporate good-looking mathematical exposition into my question/answer? Posting Challenges What details should always be given ...

support faq

Huỳnh Trần Khanh

I'm very new so... anything goes really. preferably Turing complete (and is actually a golfing language not something weird like brainfuck and whitespace where an average program is orders of magnitude longer than a program written in a conventional language)

i can't really be more specific lol as i know nothing at all

caird coinheringaahing

05AB1E is a good golfing lang to get started

It's not overly complex to get started, but typically requires some lateral thinking to get really short answers

AncientSwordRage

11:21

I recommend lots of reading

Huỳnh Trần Khanh

yeah I'm p good at binge reading stuff but hey i need something to read lol, can you link to interesting stuff about code golf that i should read

AncientSwordRage

points at questions on this website

Lyxal

@HuỳnhTrầnKhanh alternatively, you can start with (shameless self promotion) Vyxal, which has a few features 05ab1e doesn't have like functions as objects and lambdas

caird coinheringaahing

Reading explanations of other answers is a good way

6

Huỳnh Trần Khanh

oh okay, what do you think about the esolangs wiki? is it a decent place to get started

or is it outdated or something

Lyxal

11:25

Esolangs wiki can be a tiny bit brief most times

But it's a good starting point

caird coinheringaahing

@HuỳnhTrầnKhanh I think the 05AB1E page is fairly up to date

Huỳnh Trần Khanh

thank you, i gtg now. you are an awesome bunch ❤️🙌

Lyxal

o/ bye for now!

Adám

11:45

Announcement about the APL Problem Solving Competition: A blog post about last year's phase II has been published. You still have three months to learn APL and enter the 2021 round. Ping me if you need pointers.

4

caird coinheringaahing

I think that's ok to have pinned, at least for a few days?

A username

Jon Skeet can recite pi. Backwards.

AncientSwordRage

can anyone recommend a good queue-based programming language to learn from?

rak1507

codegolf.codidact.com/posts/281542#comment-10038 what should I reply to this

user

12:03

What you replied looks okay

Taking input by inserting into source code is probably not allowed on codidact either

rak1507

no, and "ABC" "DEF" just concatenates, it doesn't actually solve the challenge

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Drawing the Mathematics Stack Exchange logo (ASCII Logos 2) The goal is to create the Mathematics Stack Exchange logo using ASCII characters. It looks like this. The exact output should look like this: _ /=/ \=\ /=/ \=\ | ...

Razetime

12:24

@AncientSwordRage queue based?

I can't really remember too many

Bubbler

Brain-Flueue? :P

AncientSwordRage

12:42

@Razetime as opposed to stack based

esolang wiki has a bunch, but it's hard to know where to begin

Razetime

Conor O'Brien has a lot of esolangs

bound to be a deque there somewhere

Bubbler

Actually deque-based ones are not very different from tape-based ones

Razetime

@AncientSwordRage esolangs.org/wiki/Kepler

weee

deque based golfing language

Redwolf Programs

Dotcomma has a queue but I got rid of it

Actually I didn't, I just stopped using the "newer" version that had one

But it does have a queue

(not a deque)

EnderShadow has doubled their rep from the XKCD KotH lol

caird coinheringaahing

48 upvotes in <2 days is wild

Razetime

12:48

half the answers there are memes

caird coinheringaahing

That's the best thing about KotHs :P

Razetime

i haven't seen this many in one before

Redwolf Programs

It's similar to my first KotH, I think the title is one of the main things that draws people into those

Yeah, this KotH is particularly susceptible to meme answers

AncientSwordRage

@Razetime investigating!

Redwolf Programs

The skill ceiling isn't particularly high

caird coinheringaahing

12:50

It's been top of the HNQ for a solid day now

Redwolf Programs

But the low entry barrier is good for a different reason

AncientSwordRage

It's a perfect storm of meme's and low barrier to entry

Razetime

@AncientSwordRage 1+ is deque based and very hard to use competently

caird coinheringaahing

Add in xkcd and you get a lot of new users trying their hand at it

Redwolf Programs

The better I've got at designing KotHs the fewer people have competed in them lol

My first one was like this one

All my recent ones have been averagely good, with just a few answers

Razetime

12:51

Honnold took like 5 minutes to make and took many days to beat

Redwolf Programs

I guess clickbaity titles is the trick (although you'd think Political Simulator would have been clickbaity enough)

I have to leave to go to school now :/

AncientSwordRage

@Razetime that's my experience so far

StackMeter

13:20

[can anyone help me fix this] (tio.run/##K6gsycjPM9YtqCyo/P@/WMFWQakgryy/…)

Wezl

ruins dramatic entrance

good morning

caird coinheringaahing

@StackMeter You haven't close the quotes properly

Razetime

@StackMeter Try it online!

caird coinheringaahing

s = "pnvos\"R\"+"v(c"+"\'" is s = "pnvos\"R\"+" v( c "+" \'" with some spaces

You can't have \ in function calls

Redwolf Programs

Lol I really don't get why the spammer trying to sell opioids is talking about how you should pay attention to pain...isn't the point of painkillers to do the opposite?

Razetime

13:24

the first mistake is actually reading the words of the spammer

caird coinheringaahing

^

Redwolf Programs

> The term “pain” refers to the high unpleasant physical sensation in any part of the body.

Thanks, I had no idea

CMC: Golf a program which meets the requirements for the AP compuer science performance task. Write a program or function which: takes meaningful input, produces meaningful output, includes a list which is necessary for the functioning of the program, and contains a function or procedure which makes use of both selection and iteration (or recursion) and is used within the main program/function

(M for Medium Difficulty)

Razetime

is it required to halt

Redwolf Programs

No, but you'd still have to produce meaningful output

caird coinheringaahing

@RedwolfPrograms Jelly, 2 bytes ỊƇ. The input is a list of integers. The output is the elements of the list that are -1, 0 or 1. Ƈ (filter) does both selection and iteration.

I don't know what "includes a list which is necessary for the functioning of the program" means

Wezl

13:31

yeah just submit that ^ XD

Redwolf Programs

The inner function has to be one defined in the program (didn't clarify that right)

caird coinheringaahing

@RedwolfPrograms Jelly, 4 bytes Ị¶ÇƇ

Redwolf Programs

And the list part means that you have to make use of a list or collection type in some manner (other than I/O), in a place where anything other than a list would be difficult to use

caird coinheringaahing

The inner function is called with Ç :P

Wezl

here, take this function, now wait a sec while I ~~ruin~~ golf it

caird coinheringaahing

13:33

@RedwolfPrograms That seems to be the only "difficult" bit of the CMC

The rest just boils down to "write a filter function"

Redwolf Programs

In JS, I could probably do something like: f=i=>(g=j=>j?g(j-1)*2:1)([...Array(i).keys()])

(sum of the first n powers of two I think)

Maybe they won't notice 2**i-1 works

(I've already got mine finished, so don't worry that you're helping me cheat or anything)

caird coinheringaahing

@RedwolfPrograms Slightly more interesting: Jelly, 7 bytes Try It Online!

That takes a list of lists and returns the lists with exactly one maximal element. M fails on integers, so if any of the elements of the inputs aren't lists it'll error: Try it online! (M is one of a few builtins in Jelly which doesn't promote integers to arrays, and breaks instead)

StackMeter

# [Python 3 (PyPy)], 70 bytes



def a(n):
k = 0
for i in range(len(n)):
k += n[i]
print(k/(i+1))

[Try it online!][TIO-ko4d63ip]

[Python 3 (PyPy)]: http://pypy.org/
[TIO-ko4d63ip]: https://tio.run/##FcpBCoAgEEbhvaf4lyMSFe0CTxIthLQGYxRx4@nNdg@@l1t9kmxTbrn1fvkAR6J3hQiLRSGkAgYLipPb0@tl8O9jMBZy8Dk6F5ZKcSY2q9a9fw "Python 3 (PyPy) – Try It Online"

this takes the rolling average of the list

Wezl

can't you just use sum(n)?

Razetime

@Wezl that isn't upto AP standards

Wezl

13:45

true glares at python for having a sum builtin anyway

StackMeter

@Razetime it requires some obfuscation

Razetime

just implement a bf interpreter and perfornt he same thing

user

14:04

@RedwolfPrograms Haskell, reverses a list: rev l = go l [] where go [] a = a ; go (h:t) a = go t (h:a)

Wezl

good example

user

14:20

@RedwolfPrograms Scala, multiplies every element by 2: _ map 2.*

Wezl

:( :( :( "Title must be at least 15 characters." SE doesn't support golf

user

Btw thanks @cairdcoinheringaahing, now my most upvoted answer is frickin' Crab :P

@Wezl ikr

More proof that we need a dedicated site for Code Golf with a different model

Razetime

does anyone know a simple an strightforward FRACTRAN interpreter?

user

Trying to answer Bubbler's question? :P

Razetime

I just need something that takes a comma separated list of fractions and a single integer input

@user oh no no

that's awfully difficult

only 3 people in the world have made such a thing

user

14:30

Oh lol

Razetime

but a general fractran interpreter is pretty easy

New Main Posts

0

Q: CDGLF: TMN to APL

In this challenge you will remove one of my least favorite features, operator precedence from traditional math notation, to acheive the syntax of one of my favorite languages, APL. The APL subset we will be working with includes only a few functions and single digit numbers. (No arrays!) Here is ...

code-golf string parsing compiler

Razetime

Posted, please help with more test cases

Huỳnh Trần Khanh

14:48

@Wezl btw i find the comment length threshold annoying as well, on PPCG comments can be chatty right? so what's the point 😂

Wezl

it stops things like +1 which aren't helpful

but it also blocks simple "yes"s and "no"s

user

I don't know about allowing chatty comments, but it's very annoying for TIO links

Redwolf Programs

Just convince them that a minimum length doesn't lead to more quality by using you fricking idiot as padding :p

[Try it online!] you idiot

Trailing whitespace is allowed you blithering buffoon

Turned in my AP computer science project, it's 30% of the final score so I hope I did it right :p

John Dvorak

You can always add a superellipsis.........

Wezl

>:| Vyxal

it's probably a good language but it's cutting in line and I don't want to admit that there's a good reason

Huỳnh Trần Khanh

14:57

hmm wdym by cutting in line

nvm

Adám

@JohnDvorak Uh: ………

caird coinheringaahing

@user Your Top 3 voted answers are all thanks to me :P (2 are answers on my challenges, one is Crab)

user

:P

And all of them are low-effort

Adám

CMC: Given a non-negative number, produce that many "leader dots" (from ․ and ‥ and …) using as few characters as possible. E.g. for 4: ․… or …․ or ‥‥ and for 6: ……

user

So it's kinda converting to base 4, but without zeroes? (edit: that's wrong, nvm)

Huỳnh Trần Khanh

15:13

i keep wondering how ppcg people can come up with a computer architecture for the game of life, their work is amazing

Razetime

that was a long collaboration afaik, some of the people who made that are in the discord

#quest-for-tetris has their logs

user

@Adám Simple solution in Scala: n=>"…"*(n/3)+"‥"*(n%3/2)+"."*(n%3%2)

Might be a cooler way to do it, but for only three distinct characters, it's probably longer

Huỳnh Trần Khanh

@Razetime that sounds cool! i can't run the actual golly file though

the file is p huge but when i open it there are some mysterious figures that don't resemble tetrominos at all

i can't really figure out a way to actually play the game

fasterthanlight

16:01

Does anyone have suggestions or feedback regarding

0

A: Sandbox for Proposed Challenges

KoTH - JS WarBots king-of-the-hilljavascript Based on King of the Hill: Robot Battle Rules and Instructions Program a bot as an object in JavaScript. The functions that can be called are: left(name) Moves left 1 unit (x position -1) right(name) Moves right 1 unit (x position +1) up(name) Moves ...

Redwolf Programs

You should be able to remove the need to pass the bot's name for the functions, just set a variable in the controller that holds the name of the currently running bot.

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

KoTH - JS WarBots king-of-the-hilljavascript Based on King of the Hill: Robot Battle Rules and Instructions Program a bot as an object in JavaScript. The functions that can be called are: left(name) Moves left 1 unit (x position -1) right(name) Moves right 1 unit (x position +1) up(name) Moves ...

Wasif

@Adám Try it online! Python 2, 21 bytes

If you meant this

rak1507

no, using multi dot characters like ……

Wasif

???

rak1507

16:14

…… is one character

so for 6 you output ...... but you should output ……

Wasif

eh.... no

rak1507

wdym

Wasif

@rak1507 if it is three chars for one byte then how in world we would output one of them

rak1507

I'm not sure what your question is, the challenge is to output a number of dots using as few characters as possible, ...... is 6 characters, …… is 2 characters

@rak1507 sorry this should have been clearer, it uses … which is 1 character

pxeger

@Wasif … is a single character, a unicode ellipsis, that looks like 3 dots but is really only one character

Wasif

16:19

oh now I understand

Wezl

CM?: Is 'fish' pronounced with a long or short 'i'? Same question for 'Hi'.

Redwolf Programs

…

Wasif

@Wezl short i sound

Wezl

right, I pronounce 'Hi' that way too

rak1507

lol

Wasif

16:27

Then something like this in python for the dot question

yay 2 byte saved

Huỳnh Trần Khanh

are KoTH challenges always in JS? why can't KoTH challenges be language agnostic?

Wezl

it's harder to write a controller that works for any language

Wasif

@HuỳnhTrầnKhanh no it can be in any language

i prefer python

Wezl

@HuỳnhTrầnKhanh JS is popular and portable

plus there are still other ways to get other languages to run on JS, though people rarely use them (maybe because of the packaging involved?)

Huỳnh Trần Khanh

i was thinking about something along the lines of the bots communicating with the controller over standard streams, would that be doable

Redwolf Programs

16:37

Yes

But you probably won't get as many submissions

Wezl

but irritating and you'll have to install multiple new languages to run the submissions

Huỳnh Trần Khanh

ah ok thanks 👋

Redwolf Programs

17:00

If f and g are functions, should f g x be f(g(x)) or f(g)(x)?

Right associative is better, right? So it'd be the first, f (g x) not (f g) x?

hyper-neutrino

@flawr Hey there, long time no see! I think you've been in chat a couple of times since I got it but we just missed each other here by coincidence :)

hope you're doing well

Wezl

@RedwolfPrograms I'm in favor of currying and the first one, but the second is fine, especially if arguments are tupled (arguments are passed in a list)

hyper-neutrino

For anyone who's interested - Mast has been added as a mod on CR; following the election, there was universal support to just add them in as a mod alongside the two elected candidates (there was a 0.035% margin between Mast and Peilonrayz anyway :P)

Wezl

for golfing reasons the second one is better because some things can't be called

user

17:20

Anyone know how to add a single keyword to a language's syntax highlighting in Sublime Text?

I wanted to add enum as a keyword, so I tried taking the Scala syntax file and adding ..|enum|... wherever keywords were mentioned, but now it's acting up

Wezl

5 minutes to make an interpreter for a language that uses only Z and z as commands

John Dvorak

oh no, not another Brainfuck dialect!

Wezl

it doesn't have to be

caird coinheringaahing

@Wezl Lemme just write up an interpreter for Zunary :P

user

s => s |> window.atob |> eval

rak1507

17:31

whirl but replace z with 0 and Z with 1

John Dvorak

@Wezl but it will be

Wezl

I'll make one like iota

user

I just downvoted all the answers on a question. I feel happy now :)

hyper-neutrino

17:47

why (as in why does that make you happy) :P

Neil

@Adám Retina, 23 bytes: Try it online!

Wezl

18:22

@Wezl fwiw here's my (late) submission

const Zz=(p,s=[])=>!p?s:Zz(p.slice(1),p[0]==="z"?[...s.slice(0,s.length-2),s[s.length-1](s[s.length-2])]:[...s,p[0]==="Z"?(f=>f(x=>y=>z=>x(z)(y(z)))(a=>b=>a)):p[0]]);

unfortunately it's not golfed at all

fatiherikli.github.io/fil/…

What does this link show for you?

user

@hyper-neutrino I like destroying people's lives /s

I was mostly joking, low-quality questions and answers like that don't actually make me happy

:57835582 const last=a=>a[a.length-1]

const I=a=>a;
const K=a=>b=>a;
const S=x=>y=>z=>x(z)(y(z));
const i=f=>f(S)(K);
const Zz=(p,s=[])=>!p?s:Zz(p.slice(1),p[0]==="z"?[...s.slice(0,s.length-2),s[s.length-1](s[s.length-2])]:[...s,p[0]==="Z"?i:p[0]]);
const Kp=Zz("ZZzZzZz"); // This is K but defined in Zz.
/*
 * From this, one can recover the usual SKI expressions, thus:
 * K = (ι(ι(ιι)))
 *     zZzZzZZ    (reversed because Zz works on a stack (which is so input can be taken))
 * (from wikipedia: en.wikipedia.org/wiki/Iota_and_Jot#Universal_iota )

Wezl

18:37

okay thanks (you can edit that to a stub now)

hyper-neutrino

would it not be easier to have z=S Z=K? also how do you close brackets like in case you want to do i(i(ii)i) or smth like that

Wezl

@hyper-neutrino there needs to be a command for application (which is z)

hyper-neutrino

oh okay

Wezl

@hyper-neutrino you just have to use combinators (not sure exactly how)

so, you have to make your own flip

caird coinheringaahing