The Nineteenth Byte

Just objects and strings get boring sometimes.

If I want proper results, I have to do this

var type = x => Object.prototype.toString.call(x).slice(8,-1).toLowerCase()

That is sad.

12:24 AM

Just encapsulate it into a function and you won't have to worry about it

That is a function

Oh

3

The type of a function is "var"? What's the point of a type declaration then?

@isaacg no var is what you (don't) have to put before every variable decleration

functions are first order objects is js

That's declaring a variable "type" and making it contain an anonymous function

So it's not a type declaration at all.

It's a variable declaration

Got it.

I'm thinking of it in c/java terms, which is a bad analogy

12:34 AM

Should I delete codegolf.stackexchange.com/a/67107/39328?

I first wrote it as a suggestion to @Maltysen, then retracted and posted it as my own answer when @isaacg pointed out the answer was wrong; then @FryAmTheEggman suggested pretty much the same thing, which Maltysen implemented.

It's fine either way, imo

I've given up on trying to wrangle Perl's CP437 decoding/encoding stuff

I have no idea why it isn't working and I don't care

So I'm just going to do it by the byte values

At this point I just wanna get this done :P

Correction:

typeof /regex/ -> object

Even better

12:53 AM

And here's a cooler way to do it:

function type (x){
    var t = Object.prototype.toString.call(x).slice(8,-1);
    if (window.hasOwnProperty (t)) return window[t];
    return x;
}

does anyone here like Voronoi diagrams? I made some pretty gifs for Computer Graphics SE: computergraphics.stackexchange.com/a/1816/16 (shameless plug, but CG.SE could definitely use some publicity :))

@MartinBüttner How are you a mod there with only 640 rep?

Or is it a smaller site?

it was created in September or October

and it's still very quiet

and I've been more active on meta than main, I think

I think I might be able to claim @TimmyD's 250 points.

what for?

Q: Novel Prime Factors of Repunits

1:08 AM

15

The Background Folks were talking prime factorization in chat and we found ourselves talking about repunits. Repunits are a subset of the numbers known as repdigits, which are numbers consisting of only repeating digits, like 222 or 4444444444444444, but repunits consist only of 1. The first co...

> I propose a hypothesis that every n has a distinct result for this algorithm -- that is, no n exists such that Rn has no novel factors. I'll offer a 250-point bounty if someone proves or disproves that in their answer.

Oh. I thought for a second you were the person posting the bounty.

I have an idea for a challenge, and I'm not sure if it's been asked already.

I was at a math camp two years ago, and these people (who are much better at math then me) mentioned that someone used Zsigmondy's theorem in a certain problem.

I just remembered it, and I think the proof is pretty easy using it.

hey

im going to fix my hat...

There's no hope for my hat

1:12 AM

What is that? a new hope?

yeah

:(

none of the hats fit on me

I had it for like 4 seconds

They're all facing forwards but my platypus is facing sideways :(

1:13 AM

You can click "show controls" to turn it

^

yeah

But it has 2 eyeholes

oh

@ev3commander Yes, but that doesn't rotate the hat in the z axis

And there's only one eye visible on my platypus

Also I have a challenge idea and I want to know if it's been asked (I'd search but I'm lazy)

1:15 AM

@MartinBüttner D3.js basically has Voronoi as a built-in.

var voronoi = d3.geom.voronoi()
    .clipExtent([[0, 0], [width, height]]);

@El'endiaStarman so does Mathematica ;)

D3 is free and browser-based. :P

there's a really nice stand-alone Voronoi implementation in JS though which I've used in the past

(i.e. without any graphics)

huh, cool

github.com/gorhill/Javascript-Voronoi

1:17 AM

Very cool.

(quietly) excuse me

(raises hand, staring expectantly with wide, innocent, curious eyes)

?

There isn't really any such thing as "taking turns" in chat.

XD

Just ask whatever question you have.

1:19 AM

I have a question idea

Given a regex r and a number n, output the n-th string that matches r.

Has it been asked?

In what ordering?

tbd

I was thinking a, aa, ..,

exactly

wait that won't work

wrong order

you'd have to order them first by length

1:20 AM

there has been something like "generate all strings of given length"

[a-z][A-Z][0-9]

I don't think that's sufficiently different

like a, b, c, ..., y, z, aa, ab, ..., az, ba, ...

no but it's to match a regex, so you have to generate the n-th string that matches the regex, regardless of length

@MartinBüttner to generate the nth string that matches a regex?

1:21 AM

@Cyoce That sounds like it could be really easily brute-forced.

Q: Regex in reverse - decompose regular expressions

oh, Doorknob asked it actually

12

The Problem I have a bunch of regular expressions that I need to use in some code, but I'm using a programming language that doesn't support regex! Luckily, I know that the test string will have a maximum length and will be composed of printable ASCII only. The Challenge You must input a regex...

code-golf regular-expression printable-ascii

Just generate all the strings and match them to the regex

@MartinBüttner Oh hey

@NathanMerrill yes, just generate enough of them, sort them, and pick the nth

it would be slightly harder

misunderstood. thought you were describing a problem of "ouput all possible strings"

1:23 AM

/a+/

with no regex involved

Some regexes (regeces?) wouldn't have an n-th match, making brute-force a little more difficult

@Cyoce why not?

What actually is be the plural form of regex?

Regices or regexen or regexps or regexes or regi.

1:26 AM

Some people say regexen but I think that should be a punishable offence

@Cyoce post it as a fastest-code problem, and it be interesting

good idea

Doorknob 冰

Martin internet-slapped me for saying "regexen" once :D

@Doorknob冰 !

That should (in theory) limit brute-force algorithms

1:27 AM

@RikerW It seems like regices or regexes. (Same as with apex)

@Pietu1998 I like regexen or regi. ducks internet slap from @MartinBüttner

hey

Regeci?

regexi?

regen

like oxen

1:29 AM

regen

like regeneration

@Cyoce I like that one.

Regexen FTW!

The plural of "vertex" is "vertices".

The rationale for "regex" => "regices".

that's what made me think regices

Yeah, and when you said it, it sounded very natural to me.

Doorknob 冰

The plural of "mouse" is "mice." The plural of "louse" is "lice." The plural of "house" is...

1:31 AM

heese!

It seems like most -ex words change to -ices or -exes.

regexes

we have the opportunity to make something great:

why not regenites

Oh, another one: "index" => "indices".

regeknights

2

1:33 AM

regekings

regedays

regimes

regxiz

regi

Golfing it a bit => rgz

1:34 AM

rxp

rci

rxi

Hey, I was wondering something: How many people in the chat have used Pyth?

rx

rgx

rx -> rxz

1:34 AM

rg

r

Doorknob 冰

@isaacg me! Only once or twice, though

rgz

@isaacg I think maybe once.

/reg(ic|enit|ex|ec)es?/

@isaacg Poll: Have you used Pyth?

6

Wow.

4-1.

1:36 AM

@isaacg I tried once, but golfing langs don't really appeal to me as much. I think they are cool, but don't use them often.

I'm all alone :(

Cool, thanks for the info.

Keep the responses coming

@Cyoce I havent posted an answer though.

here was my only pyth program => pyth.herokuapp.com/?code=%259001+4&debug=0

Somehow I've always found Pyth nicer to use than the stack-based things. Gotta see how my new language ends up.

1:38 AM

oh wow apparently platypar beats pyth for truthmachine by 1 byte

@Cyoce Hey!

...

That makes me sad.

wA

Pyth has some of these builtins not found in other (non-golfing) languages. I sometimes find myself using Pyth for stuff not related to code-golf, just because it automates some tasks.

:P

Because pl does it in 2 and I wanted some attention when I posted it

1:39 AM

.

(it's actually really clever too)

what is really clever?

My second pyth: pyth.herokuapp.com/?code=getRandom%280%2C90001%29&debug=0

@ev3commander That's no Pyth program ...

It's a Pyth program. Nobody said it was valid

1:42 AM

yeah it was my second try at a pyth program

Traceback (most recent call last):
File "pyth.py", line 664, in <module>
py_code_line = general_parse(pyth_code)
File "pyth.py", line 39, in general_parse
parsed, code = parse(code)
File "pyth.py", line 209, in parse
return function_parse(active_char, rest_code)
File "pyth.py", line 298, in function_parse
parsed, rest_code = parse(rest_code)
File "pyth.py", line 209, in parse
return function_parse(active_char, rest_code)
File "pyth.py", line 298, in function_parse
parsed, rest_code = parse(rest_code)

@Cyoce The two-byte pl solution for Truth machine

pl?

except I actually want to implement a lot of things in the interpreter before I release it so you probably won't see it for a while

@Cyoce My golfing language

oh ok

1:43 AM

It should beat Pyth at a lot of things (hopefully).

same for mine

How does it work?

what is the two-byte solution for truth machine in pl?

One second searching transcript for monologue

@Cyoce ╗¶

oh

1:44 AM

Oh, so high ASCII?

it's a non-ascii language

Dec 15 at 20:09, by quartata

Catalan Numbers in pl: ☼ç▲÷

I see

@Pietu1998 CP437 ye

But it only uses a small portion of it due to barewords strings

Anyways, click on the message to see my monologue

mine got 2 bytes with only printable typable ascii characters :P

1:45 AM

wait, since any regex can be combined into a single regex, we should call plural regex regex

@Cyoce I actually could do it with just ASCII but it would look strange.

There's literally exactly enough keys on my keyboard to fit all the operations in the language

Dec 14 at 22:34, by quartata

So something like k┴ calls the function ┴ on k

Read about it here

more strange than ╗¶? damn

Yes.

1:47 AM

did you post the pl ansewer

It would be forced to stray into unprintable range, since I actually use all of printable ASCII chars for bareword strings...

@ev3commander No the interpreter doesn't exist...

I had that stage

oh

@Cyoce ?

When I didnt have an interpreter

but I still made answers

1:48 AM

@Cyoce Er..

You aren't allowed to do that...

I didnt post

I kept a text document with all the answers to questions that I thought should work given the behaviors I had defined for the language

Oh.

Well of course I do that :P

My idea with Gol is that every program can be written using the high ASCII characters as commands, but also with only printable characters.

well good luck with the language

and good luck not getting arthritis from typing all the alt-codes

what's the minimum signature needed for a legal document?

like, could I put a single dot on the signature line?

1:50 AM

@Cyoce ...

I just use a hex editor..

or what if my signature is a blank line?

@Cyoce I use Notepad++'s character panel

even worse

I get that what I'm doing is an unpopular standpoint...

@NathanMerrill It needs to be unfakable

I use a hex editor

1:51 AM

Should be.

Please don't rub it in my face at all times.

Hello

rub what?

@quartata I use bless, which do you use?

@isaacg hexedit

I don't like it very much but I couldn't get bless working on my computer

1:51 AM

@isaacg that's not true, nearly everybody's signature can be faked

So it suffices

and they are still accepted on legal documents

I use HxD on Windows if I need a hex editor

MS Word just crashed on me again.

@SuperJedi224 Stop using Word

1:52 AM

Yeah, but a period is really easy to fake

Hey! "suffix" => "suffices"!

@isaacg not if done right...

@El'endiaStarman !

(Ignoring that I went from a noun to a verb.)

no

suffix + suffix= suffices

latin

1:53 AM

quartata used "suffices" as a verb earlier.

That's really what I was riffing on.

try it on the online interpreter!

there we go

I GTG

courts will consider whether you made the "signature," intended to make the signature, and whether you intended the signature to signify your agreement to the contract

so, it could be a dot

It could be, but you have to consider the possibility that others might like to fake your signature for nefarious purposes.

@El'endiaStarman that doesn't stop the people from using Xs

or the long line

or the squiggle

The main thing is you should be able to make the same squiggle every time and rather quickly

1:58 AM

ermahgerd my code finally works

Now I just need to implement all the built-ins

A: Novel Prime Factors of Repunits

I am perhaps a bit too happy at this... :P

(Context.)

Incidentally, that game is very nearly complete. I only have ship-ship collisions left to implement.

Goodbye for now.

bye

Okay, I'm back.

0

Proof that every repunit has a novel prime factor Using Zsigmondy's Theorem, the proof is simple. From Wikipedia: In number theory, Zsigmondy's theorem, named after Karl Zsigmondy, states that if a > b > 0 are coprime integers, then for any integer n ≥ 1, there is a prime number p (calle...

\o/

Now the question is if there is a repeated novel factor.

2:14 AM

Also, I'm at almost 5 pages of numbers and I've just reached avogadro's number

@SuperJedi224 what are you doing? It sounds fun.

I'm making a list of numbers, eventually building up to some downright massive ones.

what kinds of numbers?

Strictly nonnegative, and primarily integers

Although most of the first page is reals between 0 and 1.

Significant integers/numbers.

2:18 AM

are you ordering them by size?

Yes

FlagAsSpam

2:30 AM

How do I check if I'm still able to get a badge?

I'm not sure if I still have continuous days for the Fanatic badge. ;c