The Nineteenth Byte

zʏᴀʙiɴ101

12:01

@Quill How many keys do you have left? =)

I don't know my typing speed so I can't calc it myself :(

ProgramFOX

@PeterPeter I believe that's not allowed. Once there was a bot here, quite a while ago, but the owner was asked to move it to another room.

Quill

@zʏᴀʙiɴ101 There's a website that can calculate your typing speed

ProgramFOX

Actually the same thing happened when I ran my own bot in here.

zʏᴀʙiɴ101

@Quill Well, I'd better go typing the chat transcript with a special offline program timing me. >_>

sentenc.es

Katenkyo

I tend to write pretty fast as long as I don't have to think about what I'm currently typing

zʏᴀʙiɴ101

12:08

^^ actually a system of four websites representing four personal policies that limit your email responses to: two.sentenc.es, three.sentenc.es, four.sentenc.es, five.sentenc.es respectively.

Who here uses these?

avocad juic

0/10 they don't handle more than five

zʏᴀʙiɴ101

Just take a pre-determined amount, name it to your receiver(s), and tack on the sentenc.es signature to your messages. :P

flawr

@Quill An infinite number of keystrokes would be way scarier.

zʏᴀʙiɴ101

@Quill How many keys do you have left? =)

Quill

@zʏᴀʙiɴ101 294335994

avocad juic

12:20

@zʏᴀʙiɴ101 No, you're supposed to set the signature as your signature

zʏᴀʙiɴ101

:P

@avocadjuic Yup.

zʏᴀʙiɴ101

12:33

Let's assume.

At my age, a very fast typist with 60 WPM has ~266112000 keys left.

That's 532 programs to golf >_<

For 30 WPM that's halved to ~133056000 keys.

266 programs >_<

@Quill So, they suggest blogging every email. Some emails don't deserve to be blogged. >_>

@Quill 52 words per minute :)

Quill

nice

zʏᴀʙiɴ101

I have only 230 630 390 keystrokes left before I die.

> 1 647 359 Tweets Left

> 76 Novels Left

> 461 Computer Programs Left

> 23 063 Love Letters Left

@Quill Ah, just forgot: typing test used here.

Or

> 1 153 151 Emails to your boss left

Nathan Merrill

12:49

-1 not realistic: at least 50% of all characters typed are chat messages

zʏᴀʙiɴ101

@NathanMerrill Not really. I wrote 10317 chat messages here.

What is the single line message maximum length in chat? :/

avocad juic

@zʏᴀʙiɴ101 500 characters per line

zʏᴀʙiɴ101

Thanks.

@NathanMerrill 10317 messages is 5158500 keystrokes maximum!

Nathan Merrill

lets say you use 1/10th that

you've been here how long?

zʏᴀʙiɴ101

515850 keystrokes.

Nathan Merrill

12:55

chat user since 2015-12-26

zʏᴀʙiɴ101

@NathanMerrill Yup.

Nathan Merrill

which is 165 days.

zʏᴀʙiɴ101

Yes.

3126.(36) keystrokes per day spent on chat messages.

Nathan Merrill

therefore, we can expect you to type 1141122 keystrokes per year

you had 77 years left

zʏᴀʙiɴ101

@NathanMerrill Yes.

ohai @Rainbolt

Nathan Merrill

12:59

therefore, 87866394 chat strokes /230630390 total keystrokes

0.38098359023

zʏᴀʙiɴ101

@NathanMerrill 38.098359023% of keystrokes left if I started chatting just now? o_o

No, I don't believe that.

Nathan Merrill

no, you're going to use 38% of all of your keystrokes chatting

zʏᴀʙiɴ101

@NathanMerrill Yes.

:O

Nathan Merrill

assuming that 1. you use appx 50 keystrokes per message, 2. that the estimator was correct, and 3. that you will continue using chat like you have in the past 6 months

zʏᴀʙiɴ101

O_O

@_@

@Quill I'll waste 38% of my keystrokes chatting >_<

@Poke mon

Quill

13:02

@zʏᴀʙiɴ101 that sounds worthwhile to me

Poke

@zʏᴀʙiɴ101 mon

Quill

I'd rather chat here than waste it in emails to bosses

zʏᴀʙiɴ101

Or novels.

That's a large waste of keystrokes.

@Quill let me calculate the amount of keystrokes you chat away...

@Quill you have posted 7270 messages here until now, right?

Quill

yeah, in here

zʏᴀʙiɴ101

The maximum length of a single line message is 500 chars.

Let's assume you use 1/10th of that.

363500 keystrokes.

You've been here for how long?

avocad juic

13:07

@zʏᴀʙiɴ101 Another ~22.2k in other channels

zʏᴀʙiɴ101

@avocadjuic 29470 messages.

1473500 keystrokes.

chat user since 2015-04-13

It is 422 days from that day to today, but not including today.

3491.7061611374407582938388625592 keystrokes per day spent on chat messages.

Therefore, we can expect you to type 1274472 keystrokes per year.

Now, how much years you had left? >_>

According to your SE network profile, 73.

Therefore, 93036456 chat strokes / 294335994 total keystrokes

0.31608929215772366596794818101656

@Quill you'll waste 31% of your keystrokes chatting >_>

...

Quill

does that come with a site badge or just real life loneliness?

zʏᴀʙiɴ101

@Quill Nope.

Rainbolt

@zʏᴀʙiɴ101 Hello :)

Bálint

13:42

How many of you care about getting resources for programming?

TuxCrafting

hi

zʏᴀʙiɴ101

Welcome to Programming Puzzles & Code Golf chat, @TuxCrafting!

Bálint

@TuxCrafting Hello

1

Programming resources

Proposed Q&A site for programmers looking after viable resources on different algorithms and techniques.

Currently in definition.

Would anyone be interested in an SE like this?

zʏᴀʙiɴ101

@Upgoat is Cheddar finished?

Bálint

@Upgoat Hiiiiii!

zʏᴀʙiɴ101

14:00

wakatime.com

TimmyD

14:19

Chat mini-challenge (since chat is dead) -- Given an input string of ASCII, output the vowels aeiou in ascending order sorted by their number of occurrences in the input string. Case insensitive. Order between two letters that have the same number of occurrences is up to you. For example, "Programming Puzzles & Code Golf" should output aiueo.

code-golf

Upgoat

@Bálint hai!

zʏᴀʙiɴ101

@Upgoat How's Cheddar?

TimmyD

PowerShell v4+, 115 bytes ... param($n)$b=@{};[char[]]'aeiou'|%{$b[$_]=$n.length-($n-replace$_).Length};-join‌($b.GetEnumerator()|sort value).Name

avocad juic

Wait, PowerShell is .NET?

TimmyD

Yeah

It's a little bit different syntax than C# or F#, and it's a full shell as well, but you can get access to all of the .NET libraries

Upgoat

14:34

@zʏᴀʙiɴ101 in my grilled cheese

zʏᴀʙiɴ101

@Upgoat What means?

@Upgoat What that means?

trichoplax

Just noticed that Photography has a design quite different from standard, including different links and a photo in the header from the "hall of fame"

Upgoat

@zʏᴀʙiɴ101 means my breakfast was very tasty

@trichoplax but they were one of the earlier sites though

zʏᴀʙiɴ101

But I meant the language Cheddar, not breakfast cheddar >_>

trichoplax

@Upgoat Are later designs more restricted? I just hadn't realised there was that much potential for variation from the basic theme

The image on the front page is the "image of the week" as voted for on meta. Seems a really nice idea. Doesn't translate directly for our site, but it made me wonder if there was some different thing that we could do here

flawr

14:47

@avocadjuic avocadocentral.com

3

Jester Tran

What are some difficult algorithm interview questions for a first year computer science student?

Nathan Merrill

generate a list of primes

Upgoat

@trichoplax probably not restricted in the sense they can't do it. just SE is so backed up on site designs, they probably don't have the time

@flawr oh noi flagged that accidentky

>_> sorry

flawr

@Upgoat thanks for letting me now, don't worry=)

Nathan Merrill

@Upgoat from what I've seen, they haven't been compromising quality for speed

El'endia Starman

14:55

@Upgoat ಠ_ಠ

Jester Tran

@NathanMerrill When checking factors of a number (say, n), check up to sqrt(n)

El'endia Starman

And as usual, you'll blame your hooves, I'm sure...

Pimgd

invalid flaaags

El'endia Starman

buttoms = portmanteau of "butt" and "bottoms"? :P

Upgoat

whoops >_>

flawr

14:56

@JesterTran Or take an infinite list and perform sieving.

Nathan Merrill

@JesterTran oh, are you a first year student? You don't want to do it that way. You should probably use sieve of eratosthenes

Upgoat

I tried to click edit but deleted instead

Jester Tran

@flawr @NathanMerrill Thanks, time to learn that

flawr

@JesterTran Haskell ftw=)

avocad juic

@Upgoat You should get your hooves replaced with hands and feet

Upgoat

14:58

@avocadjuic ew no

Nathan Merrill

@flawr how does that work with generators?

flawr

@NathanMerrill could work, they key is lazy evaluation

motherboard.vice.com/read/…

2

Nathan Merrill

hmmm...you could like keep a queue of increments

Upgoat

:30211808 blame-gboard

El'endia Starman

....I guess I should go write that parallelized sieve of Sundaram blog post real quick...

avocad juic

14:59

@Upgoat 0/10 No ping

Nathan Merrill

so, if you're on the number 50, you'd have a queue, where 2->52, 3->51,...

avocad juic

@El'endiaStarman You haven't already?

El'endia Starman

@avocadjuic I've said multiple times that I should or that I want to, but I've just never gotten around to it.

Upgoat

@flawr may or may not be me

2

Nathan Merrill

and you peek the top of the queue, and see if the number maches the next number

the problem is that that requires O(N) memory

zʏᴀʙiɴ101

15:01

@Upgoat is Cheddar finished? >_>

Nathan Merrill

er, the sieve already requires that

huh, a generator for the sieve is actually really cool

Jester Tran

What is a generator?

Nathan Merrill

they allow for infinite lists

so, in python:

Upgoat

100/10

Nathan Merrill

def range():
    x = 0
    while True:
         yield x
         x = x+1

flawr

15:02

> Look at that bug!!!

zʏᴀʙiɴ101

@NathanMerrill Not x++, x = x + 1 >_>

Jester Tran

@NathanMerrill ooooh, ok

Bálint

@Upgoat Is this a picture from you after a party?

Upgoat

@Bálint yes

Nathan Merrill

@zʏᴀʙiɴ101 thanks

Upgoat

15:03

actually me after an intense debugging session with node

Bálint

@Upgoat At least you were safe

@Upgoat I feel your pain

zʏᴀʙiɴ101

\o/ @Bálint You replied!

Nathan Merrill

@JesterTran when the function is first called, it goes then stops at the "yield" function. Then, on next iteration, it resumes at the yield, and continues

avocad juic

@NathanMerrill Basically xrange

zʏᴀʙiɴ101

(instead of pinging)

Nathan Merrill

15:04

@avocadjuic range() in python 3 :)

Bálint

@zʏᴀʙiɴ101 I'm trying to get used to it

zʏᴀʙiɴ101

Yay!

Bálint

It's a bit more finicky than pinging

Nathan Merrill

meant to add the 3 XP

Bálint

My first resource recommendation proposal for SE sites was shut down, because it's not clear, so I made this instead:

1

Programming resources

Proposed Q&A site for programmers looking after viable resources on different algorithms and techniques.

Currently in definition.

mınxomaτ

15:05

@flawr Saw you join. I'm on Freezone >>Speed<<

Upgoat

@zʏᴀʙiɴ101 do you have node installed

Jester Tran

Area 51 is live?!

zʏᴀʙiɴ101

@Upgoat I don't.

Bálint

@JesterTran What do you mean by "live"?

Upgoat

;_;

zʏᴀʙiɴ101

15:06

But I can try using C9 for that.

flawr

@mınxomaτ I'm coming=)

Lembik

hi all

zʏᴀʙiɴ101

jam, let me tear off a fresh workspace...

Lembik

any haskellers in?

zʏᴀʙiɴ101

@Lembik hi part of all

Bálint

15:07

@Upgoat I only installed node, to try out UglifyJS (or something like that)

Jester Tran

@Bálint I heard about people wanting an area51.stackexchange in the past and now it's happening

Upgoat

I'll call it complete when I know it works on most systems

zʏᴀʙiɴ101

>_>

Bálint

@JesterTran It's quite an old "SE"

Jester Tran

@Bálint :'(

zʏᴀʙiɴ101

15:08

Anyone here has Windows and node for @Upgoat?

He needs to make it work on Windows.

Upgoat

anyone who does have node installed run: bash <(curl -s cheddar.vihan.org/install)

Nathan Merrill

linux only?

Zgarb

@Lembik I may count as one.

Bálint

@Upgoat I'm not sure if I want a software on my computer, wich is essentially made by a goat

Upgoat

idk should work on Mac and Windows bash

Lembik

15:09

@Zgarb great :)

@Zgarb Given a long bitstring (represented any way you like), how would you write code to count the number of set bits in each window of length 20, say?

Upgoat

@Bálint &df avocad juic also made parts of it

Bálint

@Upgoat Even better

Nathan Merrill

@Upgoat I have a bash shell on my windows machine (though git), are there any linux dependencies in the actual project

Zgarb

@Lembik Golfed or pretty?

Lembik

@Zgarb pretty!

Upgoat

15:11

@NathanMerrill realpath or readlink

Lembik

I am trying to get my head round haskell :)

I mean in a purely functional style

avocad juic

@Upgoat TIL juic can program, also &df?

Nathan Merrill

@Lembik does the concept of functional make sense?

Bálint

@Lembik That's nice

The problem with Haskell is that it's a language built on lazy evaluation and nobody's actually called for it.

Lembik

@NathanMerrill I think so

@Bálint :)

Nathan Merrill

15:12

or is it a specific technique that Haskell is using

Lembik

@NathanMerrill it refers to mutability I think

Nathan Merrill

@Lembik to an extent. If you have a non-functional language, you can still make a function functional, as long as you don't mutate the variables passed to you (or any globals)

Lembik

@NathanMerrill Right if you are willing to suffer you can do anything :) I mean Haskell is implemented in C and then run in machine code :)

Nathan Merrill

def map(list):
    new_list = []
    for i in list:
        new_list.append(i+2)
    return new_list

Upgoat

@avocadjuic &df is supposed to become disapproval face but Gboard is messing me up:|

Nathan Merrill

15:15

for example, the above function is functional, even though new_list.append() is not functional

quartata

@Upgoat Why?

Lembik

@NathanMerrill I think the key word was "pure" above :)

I mean that was an important part of "purely functional"

Nathan Merrill

yeah

Upgoat

@quartata either Hilary or trump in office isn't exactly desirable

quartata

Reality check. Having Bernie as president would be great, but his viewpoint is extreme (and a little unrealistic). History has shown that in the fight between a democratic extremist vs a republican, the republican wins. (Granted this will probably change in a decade but still)

I hate to say it but I would be much more concerned about the odds of Trump winning if Bernie was nominee.

Fatalize

15:17

"his viewpoint is extreme" wat

quartata

@Fatalize For America

Fatalize

oh right

Nathan Merrill

extreme == radical changes

Fatalize

not that extreme though

Zgarb

@Lembik Something like this may be the simplest solution.

quartata

15:17

Yeah I know from a worldwide perspective it looks pretty tame but we're operating in a 1950s mindset basically

Lembik

@quartata hmm... I am not sure I understand. Are you worried about what Bernie would do if elected or worried that he won't be elected?

Fatalize

He could advocate for strict gun control

Lembik

@Zgarb oh thanks!!

quartata

@Lembik Neither. I'm saying he probably wouldn't win if he was nominee

Nathan Merrill

its not about how extreme the viewpoint is, but how many changes it would cause in america

Lembik

15:18

@quartata that was my latter point

quartata

Oh, OK. My bad

Lembik

I prefer extreme left as they always get moderated

TimmyD

@quartata Really? Because practically every poll shows that Bernie has a better chance of defeating Trump than HRC does.

Upgoat

@Fatalize upset hillbillies? :/

Lembik

extreme right sometimes actually implements it

quartata

15:18

@TimmyD Lemme put it like this:

Bernie would attract the hardcore blue states but Hilary would also attract those since let's face it they would rather have anyone but Trump

Lembik

@TimmyD Her Royal Clintonness?

TimmyD

@Lembik Hillary Rodham Clinton

quartata

Bernie would not win in the swing states because he's too left but Hilary would do significantly better because she's more of a centralist

Lembik

@TimmyD I know! Humor clearly not working :)

quartata

The only thing Bernie would get over Hilary is the youth vote, which is (sorry) unreliable and relatively small

Lembik

15:20

@quartata in a year where a near fascist reality TV host has been chosen as the primary winner, predictions seem tricky :)

quartata

Also I hate to say this but California isn't as liberal as we look; I don't think Bernie would do too well here (as the primary showed). I suspect there would be something similar in New York

TimmyD

May 5 at 20:40, by TimmyD

The US is so far right-leaning as a whole that Hillary Clinton is considered a left candidate.

Lembik

yep

The US is a country where proposing 6 weeks paid maternity leave makes you a socialist

Zgarb

@Lembik Thinking a bit further, I think this is actually more idiomatic (use splitAt instead of take and drop).

Fatalize

^^ a commie*

quartata

15:21

@Lembik I know :(

It's really rather absurd all in all

Lembik

@Zgarb thanks so much

@quartata can you imagine what they make of paid paternity leave in Europe :)

flawr

@Lembik Whats wrong with socialists?

Lembik

communists!

@flawr it's a dirty word in the US

flawr

Dirty as fuck?

Lembik

@flawr and it is used interchangeably with communist and terrible person

@flawr that depend how you do it? :)

flawr

15:23

@Lembik uncensored=)

@Fatalize You are a prolog expert, right?

Fatalize

@flawr on that site maybe, in reality no lol

never used Prolog outisde PPCG

flawr

Do you mind if I ask you something about it anyway?

Fatalize

go ahead

flawr

As an exercise I'd like to implement "quicksort" in prolog (being aware that it is not gonna be that "quick")

TimmyD

@flawr The U.S. is still suffering the effects of McCarthy and the Second Red Scare. That was really not that long ago (1950s).

Lembik

15:26

@Zgarb it would be great if one could ask pure functional programming challenges

what languages other than haskell exist to answer those sorts of challenges?

flawr

For that I'd like to write a "function" that partitions a list in to two sublists (one greater or equal pivot element, one smaller)

But I have trouble on how to go about that.

Fatalize

"function" triggered

flawr

What do you call it then

Fatalize

what have you done yet?

@flawr Predicates

flawr

partition(_,[],_,_).
partition(P, L, [H|A], B) :- partition(P, [H|L], A, B) ,H =< P.
partition(P, L, A, [H|B]) :- partition(P,[H|L],A,B), P < H.

Lembik

15:27

@flawr kti.ms.mff.cuni.cz/~bartak/prolog/sorting.html helpful?

flawr

P : pivot, L: list, A,B are the sublists, but this approach doesn't work at all as A,B are not anchored

Lembik

pivoting(H,[],[],[]).
pivoting(H,[X|T],[X|L],G):-X=<H,pivoting(H,T,L,G).
pivoting(H,[X|T],L,[X|G]):-X>H,pivoting(H,T,L,G).

New Main Posts

0

Q: Replicating the blind watchmaker experiments in r

In Chapter 3: Accumulating Small Change of the blind watchmaker Richard Dawkins sets a computer the task of writing the phrase 'Methinks it is like a weasel' a phrase from Hamlet. He restricts the program to only read 26 capital roman letters and a spacebar, to workout how many trials it would ta...

code-golf r

Optimizer

19 stars to graduation update

Fatalize

@flawr you call recursively your predicate with [H|L] as second argument

Zgarb

15:29

@Lembik You can write purely functional code in many languages (like Python), but I think most languages that require it are Haskell or ML derivatives.

Fatalize

but your end condition is the empty list

Lembik

@Zgarb is there an objective way to judge if python code is purely functional?

Fatalize

[H|L] is one element bigger than L

so you just get an infinite loop cause the second argument gets infinitely large

Lembik

I am trying to work out if one can make a challenge that doesn't exclude all other languages

Fatalize

@flawr partition(_,[],[],[]).
partition(P, [H|T], [H|A], B) :- partition(P, T, A, B), H =< P.
partition(P, [H|T], A, [H|B]) :- partition(P, T, A, B), P < H.

Your end condition was wrong, if L is the empty list then A and B are also empty, not anything

and you got the H part wrong in the 2 other rules

You want to recursively check the first element of L, so you have [H|T] in the head of the predicate

then you call recursively on the tail T

flawr

15:33

@Fatalize ah now i see, i was not really thinking recursively

@Fatalize Thank you very much!

Fatalize

@flawr you're welcome :)

flawr

Still taking my very first steps=)

Fatalize

they are the hardest, once you "get it" it becomes much easier

flawr

@Fatalize After the second line, I could add a cut, right?

Fatalize

also you should probably put the H <= P and P < H at the beginning of the rules

so that the recursive call is last for tail-recursion

@flawr Generally you don't want to add cuts ! if it's not needed

Zgarb

15:37

@Lembik I guess so, if one uses the (somewhat obscure) Wikipedia definition. If you ban all side effects and variable re-assignment, and require that objects are immutable, I think you should always end up with purely functional code.

flawr

Doesn't the interpreter optimze that?

@Fatalize Oh ok.

Zgarb

But it may be difficult to adapt to all languages.

flawr

@Zgarb Functional BrainFuck

Nathan Merrill

@Lembik this drastically depends on the granularity you want

Fatalize

@flawr As an example of why you don't want to add a cut such as partition(P, [H|T], [H|A], B) :- !, partition(P, T, A, B), H =< P.

Nathan Merrill

15:38

I can make a single statement functional

Fatalize

?- partition(3,Z,[1,2,3],[4,5]).
Z = [1, 2, 3, 4, 5] ;
Z = [1, 2, 4, 3, 5] ;
Z = [1, 2, 4, 5, 3] ;
Z = [1, 4, 2, 3, 5] ;
Z = [1, 4, 2, 5, 3] ;
Z = [1, 4, 5, 2, 3] ;
Z = [4, 1, 2, 3, 5] ;
Z = [4, 1, 2, 5, 3] ;
Z = [4, 1, 5, 2, 3] ;
Z = [4, 5, 1, 2, 3] ;
false.

without a cut

Nathan Merrill

or a function functional

avocad juic

@Zgarb Many languages are multi-paradigm though

Nathan Merrill

or a program functional

Fatalize

but with you only get
partition(3,Z,[1,2,3],[4,5]).
Z = [1, 2, 3, 4, 5] ;
false.

which is less general :p

Zgarb

15:39

@avocadjuic Yes, but the goal seems to be to ban the non-functional parts.

flawr

Oh now I see, thank you very much for the example!!!

avocad juic

@Zgarb ban?

Nathan Merrill

making a program functional is easy: simply don't read/write a file, a window, network, or console

Zgarb

10 mins ago, by Lembik

@Zgarb is there an objective way to judge if python code is purely functional?

Fatalize

@flawr This also shows that your predicate is well-made, because it works in multiple directions with only a single implementation :p

Nathan Merrill

15:41

making a function functional is also simple: never modify parameters, or variables outside the scope of the function

(as well as the side effects listed with a program)

avocad juic

@Zgarb Hmm, that would probably need IDE-level variable recognition (?)

flawr

@Fatalize I appreciate your help, can I give you a tip in form of a virtual piece of chocolate?

Fatalize

@flawr if you used CLPFD for the inequalities, you could even get the following behavior:
partition(_,[1,2,3,4],A,B).
A = [1, 2, 3, 4],
B = [] ;
A = [1, 2, 3],
B = [4] ;
A = [1, 2],
B = [3, 4] ;
A = [1],
B = [2, 3, 4] ;
A = [],
B = [1, 2, 3, 4].

or this:
partition(I,Z,[1,2,3],[4,5]).
I = 3,
Z = [1, 2, 3, 4, 5]

flawr

What is CLPFD?

Fatalize

Pretty cool predicate all around :p

Constraint Logic Programming in Finite Domains

Lembik

15:44

@Zgarb interesting

flawr

That soulds like way too much thinking for me

TimmyD

1 hour ago, by TimmyD

Chat mini-challenge (since chat is dead) -- Given an input string of ASCII, output the vowels aeiou in ascending order sorted by their number of occurrences in the input string. Case insensitive. Order between two letters that have the same number of occurrences is up to you. For example, "Programming Puzzles & Code Golf" should output aiueo.

zʏᴀʙiɴ101

@TimmyD code-golf, shortest code wins.

Fatalize

@flawr You've seen probably that normal arithmetic in Prolog uses is and the right side of is must be fully unified, e.g. 2 is Z*Z doesn't work

zʏᴀʙiɴ101

What's the high score? :/

Fatalize

15:45

whereas in CLPFD 4 #= Z*Z will tell you that Z is either 2 or -2

TimmyD

@zʏᴀʙiɴ101 My PowerShell entry, 115 bytes

(it's also the only entry)

zʏᴀʙiɴ101

1. [:30213675] >_>
2. [:30213683] >_>

flawr

@Fatalize Oh cool. Is this what you used for Brachylog?

Fatalize

@flawr yes, by default all arithmetic in Brachylog uses that, instead of low-level arithmetic

flawr

Can I bother you with another question? append([1,2,3],4,L). produces L = [1, 2, 3|4], what does that actually say?

(I just found this when I wanted to use append([1,2,3],[4],L). instead.)

Fatalize

15:49

that L is a list that starts with 1, 2, 3 and then the rest is 4

which isn't a list so it's a bit dumb

but Prolog doesn't care about types mostly

?- append([1],test,Z).
Z = [1|test].

flawr

Ah ok, I realized that prolog doesn't really care about what something is. In one of my very first exercises I got a result like 1+1+1+1+1+1+0

(calculating the length of a list, and using = instead of is)

Fatalize

Prolog is homoiconic and things like 1+1 or [a|b] are just constructs to it that it matches

so that things like this also work:

Z = 1+A+3, A =5.
Z = 1+5+3,
A = 5.

flawr

Right, that was really confusing first=)

Fatalize

I would guess so, considering the way = works in most languages :p

flawr

why don't they make the local stack bigger???

=P

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