The Nineteenth Byte

New Main Posts

00:14

0

Write a program or function that takes in a nonempty single-line string of printable ascii characters excluding space: !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~ You may assume the input is valid. Based on the input, draw a new string arrang...

Nathan Merrill

00:26

@MᴀʀsUʟᴛᴏʀ @quartata with submodules, if A is a submodule in B, then A updates, when B downloads, do they get the older code (before A updated)?

Mᴀʀs Uʟᴛᴏʀ

@NathanMerrill ?

if you update a manually in b, you get whatever version you updated to

if you commit that, people get that version

feersum

In a repo containing a submodule, each revision is tied to a particular revision of the submodule.

Getting a new version of A into B requires a commit in B to change the associated version.

Nathan Merrill

01:08

another question, then. I cloned KoTHComm into StockExchange/src/KoTHComm. But now the package names are all wrong. Where exactly is the submodule supposed to go?

if its outside the /src folder, then I'm not sure how to access it

but if its inside the src, then I have to update all of the packages (which seems like a terrible idea with git)

feersum

I imagine there must be a flag to get around the Java directory layout thing if that's what you mean.

E.g. to have two root paths for packages.

orlp

man

sometimes

I wish I could look in 'THE BOOK'

like Erdős's book of the most elegant proofs for each theorem

imagine how much you could learn if you could see the smallest program for a certain problem for each language...

Cᴏɴᴏʀ O'Bʀɪᴇɴ

> These programmers are stupid people who care little for others.

from here

orlp

learnpythonthehardway.org/book/ex26.html

google'd

google.nl/…

Cᴏɴᴏʀ O'Bʀɪᴇɴ

lol did he just copy-paste his book twice

Leaky Nun

01:24

> did he copy-pasted

Cᴏɴᴏʀ O'Bʀɪᴇɴ

and you quoted wrong

orlp

@LeakyNun is that you in your profile pic?

Eᴀsᴛᴇʀʟʏ Iʀᴋ

@orlp are you in the netherlands?

Leaky Nun

@orlp Yes

quartata

tfw my favorite walking spot has a pokemon go gym

I'm scared to go there because I'm sure it will be infested with people

Cᴏɴᴏʀ O'Bʀɪᴇɴ

01:35

@quartata rip :(

anyone know ruby well in here?

quartata

What's your question?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

why does 1 == 1 == 1 syntax error :/

orlp

@EᴀsᴛᴇʀʟʏIʀᴋ yes

@CᴏɴᴏʀO'Bʀɪᴇɴ what language

Cᴏɴᴏʀ O'Bʀɪᴇɴ

2 mins ago, by Cᴏɴᴏʀ O'Bʀɪᴇɴ

anyone know ruby well in here?

orlp

@LeakyNun what is behind you

Nathan Merrill

01:46

@feersum @MᴀʀsUʟᴛᴏʀ @quartata as far as I can tell, there's no way to have a root inside another. Either I go the route of Maven/Gradle, or people download both repos and include both sources

orlp

a root?

Nathan Merrill

a /src folder in another /src folder

(for Java)

Cᴏɴᴏʀ O'Bʀɪᴇɴ

Apparently, this is valid ruby syntax:

array = [1, 2, 3]
array.each{
|
x
|
puts x*x
}

Leaky Nun

@orlp light

Eᴀsᴛᴇʀʟʏ Iʀᴋ

@orlp cool, I have family there

orlp

01:52

@LeakyNun well of course

that's all a camera does

capture photons

the question is, what emitted those photons

Leaky Nun

@orlp a light projector

Cᴏɴᴏʀ O'Bʀɪᴇɴ

lol

quartata

@CᴏɴᴏʀO'Bʀɪᴇɴ Is that unusual? JS is whitespace insensitive too

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@quartata no, it's a pleasant surprise. I thought ruby had its statements ended by newline. just surprising

quartata

Actually was that in IRB?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

01:56

no

Eᴀsᴛᴇʀʟʏ Iʀᴋ

We need a LWQ filter that removes posts of the form:

#\w+, \d+
    .+

>_>

Cᴏɴᴏʀ O'Bʀɪᴇɴ

why not just

#.+
    .+

Eᴀsᴛᴇʀʟʏ Iʀᴋ

true

but that could also skip posts with no bytecount, which needs to be fixed 90% of the time

Cᴏɴᴏʀ O'Bʀɪᴇɴ

<h\d>.+<\/h\d>
<(pre|code)>.+<\/\1>

there, use regex to parse HTML

El'endia Starman

Err, wait, context?

Eᴀsᴛᴇʀʟʏ Iʀᴋ

01:59

._.

3 mins ago, by Eᴀsᴛᴇʀʟʏ Iʀᴋ

We need a LWQ filter that removes posts of the form:

2 mins ago, by Eᴀsᴛᴇʀʟʏ Iʀᴋ

#\w+, \d+
    .+

@CᴏɴᴏʀO'Bʀɪᴇɴ pls no

El'endia Starman

@EᴀsᴛᴇʀʟʏIʀᴋ I'm deaf, not blind.

Eᴀsᴛᴇʀʟʏ Iʀᴋ

38 secs ago, by El'endia Starman

Err, wait, context?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

>_<

Eᴀsᴛᴇʀʟʏ Iʀᴋ

what do you mean then?

El'endia Starman

Yeah. I asked that after looking at your messages and trying to figure out what you were talking about.

Eᴀsᴛᴇʀʟʏ Iʀᴋ

02:01

low quality posts review queue gets tons of reviews that are just code with no explanation

Cᴏɴᴏʀ O'Bʀɪᴇɴ

dead("You greedy bastard!")

Eᴀsᴛᴇʀʟʏ Iʀᴋ

I was saying to filter out those

@CᴏɴᴏʀO'Bʀɪᴇɴ o_o

Cᴏɴᴏʀ O'Bʀɪᴇɴ

learning ruby the hard way is kind of mean ._.

El'endia Starman

@EᴀsᴛᴇʀʟʏIʀᴋ Ahhh, okay. I don't normally man the review queues here, so I didn't know.

Eᴀsᴛᴇʀʟʏ Iʀᴋ

oic

NinjaBearMonkey

02:04

Are comments on rejected edits shown to the user that suggested it?

Dr Green Eggs and Iron Man

Yes

Eᴀsᴛᴇʀʟʏ Iʀᴋ

yes, but he doesn't normally get notified of the rejection

Dr Green Eggs and Iron Man

@EᴀsᴛᴇʀʟʏIʀᴋ wouldn't you want #\w+ \d+ (bytes)\?

Eᴀsᴛᴇʀʟʏ Iʀᴋ

yeah

feersum

@NathanMerrill There's no need to have a root inside another. You could have foo/src and foo/submodule/src.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

02:07

@DrGreenEggsandIronMan (?:bytes|char(?:acter)?s?)

Nathan Merrill

@feersum then how does foo/src reference foo/submodule?

feersum

@NathanMerrill Put multiple classpaths in the java invocation.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

> If you follow these simple rules, you will start writing better code than most programmers.

oh my are there that many bad programmers

(simple rules = simple things about if statements)

Dr Green Eggs and Iron Man

@CᴏɴᴏʀO'Bʀɪᴇɴ great. Now handle blytes and keystrokes, and zeroes for all.

I mean ones, not zeroes. Properly pluralize submissions with a score of one.

Rohan Jhunjhunwala

@MartinEnder im intereesting in making a k-o-t-h cahllenge called enders game. MAy I?

It will involve playing enders game in four dimensions

*three

El'endia Starman

02:16

Ender? As in, Ender Wiggin?

Or Martin Ender?

Or Minecraft's Endermen?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@DrGreenEggsandIronMan (?:bl?yte|char(?:acter)?|keystroke)s?

Rohan Jhunjhunwala

ender wiggin, and Martin Ender I guess

it would be to honor his 100k

El'endia Starman

Alright, I think I know what game you're talking about. "The enemy's gate is down.", right? How would that work for us?

feersum

Martin likes it when people make challenges referencing him. Especially if they involve superimposing his photo on tubs of margarine.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@El'endiaStarman Why not all of them? Martin Wiggin Endermen!

Dr Green Eggs and Iron Man

02:18

Oh wait, nvmd.

We're used to different flavors.

Leaky Nun

@MartinEnder Prove it

Helka Homba

No one likes turtles :(

Downgoat

@HelkaHomba ;_; @everyone y u no liek trichoplax

quartata

I like turtles

Cᴏɴᴏʀ O'Bʀɪᴇɴ

moi aussi

Leaky Nun

02:38

\o/

Cᴏɴᴏʀ O'Bʀɪᴇɴ

I am deeply disappointed at ruby for requiring module variables to begin with a capital letter :/

El'endia Starman

@LeakyNun Congrats, you outgolfed Dennis! Now you just wait and watch as he turns the tables on you...

Leaky Nun

@El'endiaStarman lol

Rohan Jhunjhunwala

@El'endiaStarman it would be similar to the dogfighting tournament

Eᴀsᴛᴇʀʟʏ Iʀᴋ

Rohan Jhunjhunwala

02:50

@El'endiaStarman each bot is a box. and can only move and shoot in one of the 26 directions around it. It can only change its trajectory when it is touching something else, but it can shoot at any time. The map is a cube

The winning team is the first team to get a bot into the enemies gate

El'endia Starman

@EᴀsᴛᴇʀʟʏIʀᴋ Hahaha nice.

Eᴀsᴛᴇʀʟʏ Iʀᴋ

:P

El'endia Starman

@RohanJhunjhunwala Oooh, neat. I'd suggest doing it in 2D, since I think that'll be just about as interesting and it'll also be easier to implement, both for the framework and for the bots.

Rohan Jhunjhunwala

ok

I like it

I will sandbox it.

I am currently working on another k-o-t-h. so once I release it I will add that one

El'endia Starman

You can sandbox multiple KotHs at once.

Rohan Jhunjhunwala

02:55

yeah I know

thats what im doing. Im just adding a work in progress sandbox post

so ican flesh it out tomorrow after i get some sleep\

Dmitry Kudriavtsev

I have a koth idea

Leaky Nun

@El'endiaStarman It has happened.

El'endia Starman

@LeakyNun Ha ha! The race begins!

Rohan Jhunjhunwala

:D

Dimitry what is ur idea?

Dmitry Kudriavtsev

Here it is.

Bot can move in the 8 directions around it (2d game based on cells)

there are walls and other obstacles. each bot gets 1 bullet per turn and starts with 5 health

bot can shoot in the 8 directions around it as well

play field is something like 20x20 cells

every time you shoot another bot their health decreases by 1

you can shoot max 3 bullets per turn. you can save them up across turns

obstacles/walls block bullets

there are also health packs that can be picked up by anyone once.

they provide +3 health. max health is 10

they are pretty rare though.

Bullets move until they hit a wall or the edge of the playing field.

If you try to move into a wall you lose your turn.

All turns happen at once

You can move or shoot in a turn, not both.

@anyone

@RohanJhunjhunwala

Eᴀsᴛᴇʀʟʏ Iʀᴋ

03:08

what if you move into another bot?

Dmitry Kudriavtsev

you can't. they are treated like walls

Also, the bot can only see in a 5 cell radius square

9 cell diameter/sides

Rohan Jhunjhunwala

I think there is already such a challenge

like a tank battle challenge

but ur idea is diffferent enough to make it interesting

post a sandbox post and flesh out the mechanics

Dmitry Kudriavtsev

OK, sure. I'm about to make a mockup in Notepad

Helka Homba

@DmitryKudriavtsev Implement and post it in the sandbox. There's lots of potential and unused ideas for koths but actually executing them is the tricky part

Dmitry Kudriavtsev

OK, sure.

Making a mockup right now!

Rohan Jhunjhunwala

03:13

I hope the mighty Martin Ender will approve of the game i made in his honor

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

The Enemy's Gate is Down! (Ender's Game) Please note this is a work in progress Your challenge should you choose to accept it is to play ender's game to win king-of-the-hill style, in honor of Martin Ender first receiving 100k rep! You will split up into teams. You are red if you are an even po...

El'endia Starman

@NewSandboxedPosts @Rohan, can you not use Os for empty space? Use plain spaces instead.

Rohan Jhunjhunwala

ok

Dmitry Kudriavtsev

yes, that would be better

Rohan Jhunjhunwala

done

El'endia Starman

03:20

Oh wow, that's so much better. I didn't see most of the walls.

Nathan Merrill

@DmitryKudriavtsev if you are interested, I have a KoTH framework that can help you write your controller

its still in active development, and I'm close to finishing the piping module so you can talk to other languages

Dmitry Kudriavtsev

Thanks @NathanMerrill

zyabin101

Hello

Nathan Merrill

there's not a whole lot of documentation, so if you have any questions, feel free to ask

Sherlock9

@NathanMerrill Do you have to write the game in Java too?

Nathan Merrill

03:28

@Sherlock9 yes, the controller has to be in Java. The players don't

Sherlock9

Well, nuts. I don't know Java.

Dmitry Kudriavtsev

Mockup incoming

Also, can you rewrite it in Ruby please?

hastebin.com/umebavojec.css

There's the mockup

Helka Homba

I'd advocate JS, if only so anyone can instantly run the battles in their browser (see codegolf.stackexchange.com/questions/48353/…)

zyabin101

@DmitryKudriavtsev Hastebin is a IPFS file viewer.

AFAIK.

Dmitry Kudriavtsev

ipfs?

Nathan Merrill

03:32

@DmitryKudriavtsev how was that generated?

Dmitry Kudriavtsev

by hand

zyabin101

WAIT, HOW THAT CAN OPEN/SAVE FILES? o_O

Nathan Merrill

bah

zyabin101

bah

Helka Homba

black sheep

Dmitry Kudriavtsev

03:33

Hastebin is a pastebin.

Leaky Nun

@El'endiaStarman \o/

El'endia Starman

Huh, someone downvoted all the golfing language answers on that question.

zyabin101

@HelkaHomba have you any wool

Leaky Nun

The Dark Knight - Some Men Just Want To Watch The World Burn

►

zyabin101

@El'endiaStarman He obviously hates golflangs so much, that he wants to downvote them by opinion.

I thought downvotes are if the post adds nothing to the discussion.

Mᴀʀs Uʟᴛᴏʀ

03:38

@zyabin101 sure?

zyabin101

@MᴀʀsUʟᴛᴏʀ I realized that it can possibly open/save files q_q

Mᴀʀs Uʟᴛᴏʀ

@HelkaHomba wouldn't be too hard, but running other languages via js isn't easy

Helka Homba

Yeah, that's the tradeoff

Mᴀʀs Uʟᴛᴏʀ

@zyabin101 ???

@HelkaHomba unless you use node

Helka Homba

@MᴀʀsUʟᴛᴏʀ Although ;)

Mᴀʀs Uʟᴛᴏʀ

03:42

esolangs won't be too hard, it's normal langs that are the problem

Nathan Merrill

@HelkaHomba oooh, it'd be cool if I could make a stack snippet that AJAXed a submission in, and get results back

Mᴀʀs Uʟᴛᴏʀ

i'm trying to create a universal fungeoid/stack-based language interpreter, doesn't seem too hard

@NathanMerrill like the design userscript's auto-tio?

Nathan Merrill

I don't use that userscript

Mᴀʀs Uʟᴛᴏʀ

but it would be something like auto-TIO right?

Nathan Merrill

sure. I'm guessing it takes a script, and runs it on TIO, and puts the results somewhere?

Mᴀʀs Uʟᴛᴏʀ

03:50

not realły, it just runs any TIO links

and shows the results

but for the koth: yeah it'd need to take the language as well

Downgoat

04:10

@zyabin101 downvotes are if you dont think answer is good. while downvotes shouldn't be influenced by opinions, that doesn't really happen, our candidates for mods have voted by opinion

zyabin101

@Downgoat So, the one who hates golf langs doesn't think answers in these are good.

Downgoat

@Dennis does try it online backend take UTF-8 encoded code?

@zyabin101 EMBLEM?

Dennis

The transmission is done in percent-encoded UTF-8. The backend can use whatever encoding you need.

Downgoat

@Dennis does it send response back in source encoding or language-specific encoding? auto TIO on userscript has trouble with non-ASCII langs

Dennis

It depends on the interpreter and the encoding that is specified for it. What's auto TIO?

Mᴀʀs Uʟᴛᴏʀ

04:19

@Dennis userscript queries tio for output

basically shows any tio output below tio links

Leaky Nun

TIL you can duplicate the current tab by dragging the current tab to the new tab button

Downgoat

question: should it be fd.readc or fd.read(1) or fd.readchar?

Mᴀʀs Uʟᴛᴏʀ

wouldn't read(1) be readline?

zyabin101

@Downgoat fd.nextByte(), because methods should start with next....

Mᴀʀs Uʟᴛᴏʀ

also, idk, c uses get, js uses camelcase

Downgoat

04:27

@MᴀʀsUʟᴛᴏʀ no .read reads certain amount of bytes

@zyabin101 cheddar doesn't use camelcase

zyabin101

@Downgoat Then I choose none of the above.

Mᴀʀs Uʟᴛᴏʀ

@Downgoat cheddar needs a convention to stick to

so either shorter or more readable

read(1) should stay, plus pick one of the other two

Downgoat

.readc then as i've done .vfuse

zyabin101

@Downgoat when Cheddar gets released?

I can change the names to a normal format.

Downgoat

@zyabin101 pretty soon. just gotta finish some stuff. I'm having less and less time as the weeks go by though.

Zwei

04:34

Hello

Leaky Nun

@Zwei guten tag

Mᴀʀs Uʟᴛᴏʀ

@Downgoat wait why

don't normal people have the same amount of time every week

Dennis

@MᴀʀsUʟᴛᴏʀ Oh dear, that sounds like a lot of unnecessary load for the server.

Does it at least cache the responses?

Mᴀʀs Uʟᴛᴏʀ

@Dennis yeah, just realized that, and it doesn't cache responses

Downgoat

@Dennis yes i believe so

Mᴀʀs Uʟᴛᴏʀ

04:40

@Downgoat but last time i checked it didn't

Downgoat

wait wat ._.

well i added option to disable

Mᴀʀs Uʟᴛᴏʀ

maybe hyperdrive + browserify + indexeddb would work?

Downgoat

wat

Mᴀʀs Uʟᴛᴏʀ

hyperdrive to share existing output from TIO across users, indexeddb to store locally otherwise localstorage dies

which means TIO would only need to run + send once, reducing server load by a lot

Helka Homba

strawpoll.me/10893650

Option 6: memes

Option 7: directional boats ;)

Downgoat

04:57

Option 8: Python

@HelkaHomba -1 for being mean to goats :(

Helka Homba

Goats?

@Downgoat Alright. I'm sorry 🍰

Leaky Nun

0

A: Hofstadter H-sequence

Python 3, 72 bytes def f(n): a=[0];i=0 while n:i+=1;a+=[i-a[a[a[i-i]]]];n-=1 return a[i] Ideone it!

Ugh, new challenge

Zwei

that challenge looks like a good fit for functional programming languages

New Main Posts

05:14

0

Q: Hofstadter H-sequence

Definition a(0) = 0 a(n) = n-a(a(a(n-1))) for integer n > 0 Task Given non-negative integer n, output a(n). Testcases n a(n) 0 0 1 1 2 1 3 2 4 3 5 4 6 4 7 5 8 5 9 6 10 7 11 7 12 8 13 9 14 10 15 10 16 11 17 12 18 13 19 ...

code-golf sequence number-theory recursion

I EAT SPAM FOR BREAKFAST

3

zyabin101

@NewMainPosts Please make that go away.

Bang.

Downgoat

@HelkaHomba apology/cake accepted 🍰🍽🐐

@HelkaHomba I don't take the goat bashing/eating/foodnotfriends personally but it does get irritating because i like goats and, for example, I'm pretty sure people would get pissed if I started talking about "oh dogs are so tasty, golden retrievers are the best, especially when fried" (additionally because I'm obviously a goat i dont like my brethren to be eaten). Also rather against SE's "Be Nice" policy.

orlp

05:35

@LeakyNun you might be interested in this

I(n) = I(n − 19 − I(n − 3)) + I(n − 28 − I(n − 12))

there are many sequences like hofstadters

in that sequence I(1) == I(2) == ... == I(29) = 1

a sequence can die (is invalid) if either you access a negative element somewhere (A(-1)) or a future element (A(n+1))

the above sequence is valid until n = 19517559

Leaky Nun

I see

orlp

it is unknown for many sequences if they're valid (never die) or not

you can make sequences for which it is undecidable whether they're valid or not

canadam.math.ca/2013/slides/Ruskey.Frank.Undecidable.Nested.pdf

by emulating turing machines using these sequences

Leaky Nun

@orlp perhaps u can make a challenge out of that

orlp

nah

it's kinda involved

Mᴀʀs Uʟᴛᴏʀ

so does everyone that's not American spell 'colour' with a u?

orlp

05:42

@MᴀʀsUʟᴛᴏʀ nou

Mᴀʀs Uʟᴛᴏʀ

@Downgoat wat was i online then

Downgoat

idk it showed your avatar come on

Sherlock9

@Downgoat >:P

Downgoat

question: if ctrl+r is redo what should undo be?

it can't be ctrl-u

zyabin101

@Downgoat Ctrl-Z of course!

Leaky Nun

05:44

of course undo and redo are c-z and c-y

Mᴀʀs Uʟᴛᴏʀ

^

refresh is c-r :P

Downgoat

@zyabin101 oh yes!

duh

@MᴀʀsUʟᴛᴏʀ oh no

I just relized i've been typing CR all this type to redo

D: D: D: D:D D: D:D:D:DDDD: D: D: D:

Mᴀʀs Uʟᴛᴏʀ

@Downgoat wow so many faces

Downgoat

cheddar> var fd = IO.open("README.md", 'r')
cheddar> fd.read(1)
< Instance of "Buffer" >
cheddar> Array::fd.read(1)
[112]
cheddar> Array::fd.read(6)
[32, 97, 108, 105, 103, 110]

\o/ \o/ \o/ \o/ \o/

Leaky Nun

@Downgoat Can you do my new challenge with Cheddar?

Downgoat

05:47

link?

Leaky Nun

God it's my 1234th new challenge

Mᴀʀs Uʟᴛᴏʀ

@Downgoat is there String::Buffer?

Downgoat

1

Q: Hofstadter H-sequence

Definition a(0) = 0 a(n) = n-a(a(a(n-1))) for integer n > 0 Task Given non-negative integer n, output a(n). Testcases n a(n) 0 0 1 1 2 1 3 2 4 3 5 4 6 4 7 5 8 5 9 6 10 7 11 7 12 8 13 9 14 10 15 10 16 11 17 12 18 13 19 ...

code-golf sequence number-theory recursion

this one?

@MᴀʀsUʟᴛᴏʀ oh brilliant idea

Leaky Nun

yes

Downgoat

oh cheddar is functional it should do great at that

Mᴀʀs Uʟᴛᴏʀ

05:52

@Downgoat wat how are you not on c9

Downgoat

@MᴀʀsUʟᴛᴏʀ ?

oh i switched to vim

local machine is lot faster than c9

i also get SSH keys and GPG

Dennis

Argh, why does a(0) have to be 0?

Downgoat

Nothing fancy. ! is simply the function's name. — Dennis ♦ 4 mins ago

wat ._. julia is crazy

orlp

@Dennis what would your value of a(0) be?

Dennis

@Downgoat Pretty much, yeah. All operators in Julia are actually functions. You can call 3+4 like +(3,4) if you want to. The lexer actually turns the former into the latter, and that works for the left hand of an assignment as well. Not sure if that's a bug...

7

A: Tips for golfing in Julia

Redefine operators to define functions Redefining operators can save a lot of bytes in parentheses and commas. Recursive unary operators For a unary example, compare the following recursive implementations of the Fibonacci sequence: F(n)=n>1?F(n-1)+F(n-2):n # 24 bytes !n=n>1?!~-n+!(n-2):n ...

@orlp 1 so I can save a byte.

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