The Nineteenth Byte

@AdmBorkBork Well param($a)if($a){exit($a|?{$l-ne$_;$l=$_}).count-1} is shorter than param($a)if($a){($a|?{$l-ne$_;$l=$_}).count-1;exit}0 by two bytes.

Mr. Xcoder

56

A: Default for Code Golf: Input/Output methods

Programs may output using their exit code... Exit codes are basically a return value for programs. If functions can output using their return values, it makes sense that programs should be able to do the same. Examples: Java exit codes C and C++ exit codes

Pavel

@Mr.Xcoder The issue is it isn't an actual exit code.

AdmBorkBork

6:21 PM

@Mr.Xcoder String manipulation and conversion, or things where you're converting types. PowerShell is strictly typed, but has tons of implicit casting. It's also really powerful at manipulation of things outside of programs (e.g., like an IP socket).

Mr. Xcoder

Then I dunno.

Pavel

@Mr.Xcoder A script with exit 5 has an exit code of 1, but sets a global variable you can access to 5.

AdmBorkBork

How do you dedupe a list in Jelly?

Pavel

@AdmBorkBork posted to main, you can use the exit code or the stdout solution that you wrote.

@Adám @Mr.Xcoder @WheatWizard I posted my earlier CMC to main, if you care to put your solutions to it there.

Mr. Xcoder

@Pavel I already did.

(and upvoted) :P

Pavel

6:30 PM

Well that was fast.

Mr. Xcoder

@AdmBorkBork Q.

Pavel

How to get 10 rep for free: Answer one of my posts. I will upvote it unless it's obviously invalid.

AdmBorkBork

@Mr.Xcoder Jelly, 3 bytes Try it online!

Mr. Xcoder

Nice.

AdmBorkBork

Yay, I popped my Jelly cherry. (that's my first answer in Jelly)

Mr. Xcoder

6:34 PM

@AdmBorkBork The thing is that I do not understand how it works :D

New Main Posts

1

Q: Count the changes in an array

Your task today is to write a program or function that takes an array of integers, and counts the number of times, reading it left to right, that the value changes. This is easier to show with an example: [1 1 1 2 2 5 5 5 5 17 3] => [1 1 1 **2** 2 **5** 5 5 5 **17** **3**] => 4 Test case: Input...

Pavel

@AdmBorkBork are you posting your solution to ^ or not? Because if you aren't I'm going to post the exit code solution (with credit) because it's cool.

AdmBorkBork

@Pavel Yeah, I will. The regular one.

Pavel

Ok then.

AdmBorkBork

@Mr.Xcoder So = gives you something like [0, 0, 1, 0] where the two lists have a common element. Then x repeats the elements of the list that many times, and Q dedupes.

aditsu

6:40 PM

@Mr.Xcoder CJam, 8: {:a.&:|}

Mr. Xcoder

@aditsu Salut! Nice... So glad to see you back!

AdmBorkBork

@Mr.Xcoder Does my explanation make sense? That's how I built it to work, anyway. Maybe I'm taking advantage of some quirk in behavior.

Mr. Xcoder

@AdmBorkBork TBH I still don't have a clue, but I'll figure it out. My mind is quite slow ATM.

DJMcMayhem

@Pavel Is this answer acceptable? It outputs nothing in place of 0, which is equivalent in brain-flak

aditsu

@Mr.Xcoder Hi!

Pavel

6:44 PM

@DJMcMayhem I'm going to go with yes

DJMcMayhem

Sweet

Explanation soon

aditsu

(sorry for multi-pings)

Mr. Xcoder

Thanks but WTH is that monster in the middle?

aditsu

middle?

Mr. Xcoder

Nevermind :C

@H.PWiz It is very annoying how ←Lg returns -1 for []...

H.PWiz

6:48 PM

Yes, but it's also what you would expect.

Mr. Xcoder

Yup.. Trying to fix my answer.

AdmBorkBork

Yay, I came up with the same ITL answer.

caird coinheringaahing

I spent the last 2 minutes trying to come up with some pun regarding ITL and failed miserably D:

Mr. Xcoder

#commentvotebait

DJMcMayhem

@cairdcoinheringaahing ITL be a difficult task

caird coinheringaahing

6:54 PM

@cairdcoinheringaahing Don't worry, ITL be alright

Now I think of one :P

trichoplax

@cairdcoinheringaahing TIL anagrams don't mean the same thing

Mr. Xcoder

... I spent the last 2 minutes trying to come up with a better approach than ITL

I today learned. --- Yoda.

DJMcMayhem

@Mr.Xcoder Solution: Switch to MATL

Mr. Xcoder

@DJMcMayhem Yup...

caird coinheringaahing

@Mr.Xcoder Why is that a Gandalf quote? I don't remember him saying that

trichoplax

6:56 PM

First time I saw Gandalf mistaken for Yoda

7

Mr. Xcoder

@cairdcoinheringaahing Oh no sorry >.< I was talking about Yoda from star wars

caird coinheringaahing

@Mr.Xcoder Well, at least you didn't think it was something to with Star Trek

trichoplax

@Mr.Xcoder It's easy to mix up those two franchises - they both lead up to a horrific antihero saving the world/galaxy

aditsu

pass you shall not!

Mr. Xcoder

Mistakes should I not make in the future.

Pavel

6:58 PM

If a powershell script exists without explicitely calling exit, $LastExitCode is untouched from it's previous value, and this bothers me

Anonymous

@trichoplax Darth Vader and Gollum?

trichoplax

@Mego Spoilers!

Mr. Xcoder

Relevant picture 😂

Anonymous

@trichoplax RotJ came out in 1983. RotK came out in 1955. We're far past spoiler territory here.

trichoplax

I know :P Shockingly close initials by the way

And indeed full words...

Helka Homba

7:05 PM

@trichoplax Sam was the real unsung hero. Gollum just slipped.

trichoplax

Even more similar, as both antiheros got a new name too...

Riker

this is conspiracy theory level stuff

Mr. Xcoder

Precious my Nineteenth the Byte...

DJMcMayhem

@HelkaHomba Sam was the best character

Pavel

@Mego <-- has not watched Lord of the Rings but still intends to at some point

DJMcMayhem

7:06 PM

:O

Riker

next up: darth vader's shiny suit is actually to hide that his skin sparkles in the sun

DJMcMayhem

@Pavel That's unforgiveable

J. Salle

@Pavel that's heresy.

Mr. Xcoder

@Pavel You definitely should.

AdmBorkBork

Eh, it's pretty forgivable.

Pavel

7:07 PM

@DJMcMayhem I'm working on it okay too much good stuff came out before I was born

Riker

@J.Salle I mean, if he's read the books that's enough

Helka Homba

More forgivable than not seeing Star Wars (4-6 at least).

J. Salle

@Riker that's true

Riker

anybody here watched the new blade runner?

Pavel

@Riker I have

Riker

7:07 PM

cool

I'm interested in it, not sure

trichoplax

@HelkaHomba I agree. Hard to call Darth Vader the real hero with any seriousness too :)

DJMcMayhem

@Pavel Wait, was that really before you were born? 2003?

J. Salle

@Riker Not yet, but I mean to.

Riker

this one

New Main Posts

1

Q: Approximate My Squares

Inspired by this video by tecmath. An approximation to the square root of any number x can be found by taking the integer square root s (i.e. the largest integer such that s * s ≤ x) and then calculating s + (x - s^2) / (2 * s). Let us call this approximation S(x). (Note: this is equivalent to a...

code-golf math approximation

Pavel

7:08 PM

@DJMcMayhem no, I think i got the release date wrong

Riker

@DJMcMayhem don't think so, pavel's older than me and that movie is when I was 1

Pavel

I thought it came out in the 90s

Riker

lol no

hm

2001, 2002, 2003 for movies

DJMcMayhem

No, Fellowship was 2001, ROTK was 2003, so I'm guessing TTT was 2002

Riker

yep

DJMcMayhem

7:09 PM

So Fellowship was before @Riker was born

Riker

interesting: both the LOTR movies and the new star wars ones have come out around dec 16-19

@DJMcMayhem yes

TTT was 3 days after

Anonymous

@DJMcMayhem Really they all were out before most of us were born. They were books before they were movies.

DJMcMayhem

@Riker Did you watch it on release day?

:P

Helka Homba

@Riker Lots of movies come out around holidays (obligatory youtu.be/BqSRfhQ3Ivc)

Anonymous

Wait Riker was born in 2002? imminent old feeling

Mr. Xcoder

7:10 PM

@Mego I was born in 2003 lol

:P

Anonymous

Oh ye gods no

Riker

@DJMcMayhem nope

Anonymous

I watched all 3 movies when they came out...

Riker

@Mego step right up, see this ancient piece of history

DJMcMayhem

'How long are you going to keep this up?' 'Statistically, only four or five more decades.'

Anonymous

7:11 PM

There's always an xkcd...

Anonymous

Kids these days, being young and not old like me

Riker

> being young

think kids have already done that

Anonymous

Except I'm not even old - I just feel old compared to you kids :P

trichoplax

I'm guessing you're younger than me, if that helps...

DJMcMayhem

Actually, this one is probably better

Anonymous

7:13 PM

I'm 23 :P

Riker

@trichoplax I mean, you're also tied with admborkbork for oldest user right? :p

DJMcMayhem

The Nintendo Wii has been around for the majority of my life o_O

trichoplax

@DJMcMayhem Ha ha that last one...

mınxomaτ

@Mego Pfft, when I was your age, I was already 25.

14

Mr. Xcoder

@EriktheOutgolfer Whoops I voted to undelete yours instead of editing mine, sorry!

Riker

7:14 PM

tfw harry potter is from before the turn of the millenium

Anonymous

@DJMcMayhem xkcd has been around for the majority of my life. This is a good thing.

Erik the Outgolfer

@Mr.Xcoder and you ninja'd me

DJMcMayhem

I think xkcd has been around for the majority of most peoples lives

Erik the Outgolfer

removed the undelete vote

DJMcMayhem

Wait no

That's not true

Riker

7:15 PM

@DJMcMayhem according to that it's 21 :p

DJMcMayhem

Ah

I couldn't find it

trichoplax

@DJMcMayhem Thinking that says something about your age :P

Anonymous

@Riker Well yeah. The books are set a few years before the year each was released.

Mr. Xcoder

@EriktheOutgolfer Yup thanks... Count truthy elements using identity seems just crappy.

Riker

@Mego that is true

Anonymous

7:16 PM

Book 1 was released in 1997, and is set in 1991

DJMcMayhem

It's true for me though, and I'm not 21

Erik the Outgolfer

guess who's probably the oldest person in here lol

Mr. Xcoder

Lol that's ≥ 10 years before my birth.

@EriktheOutgolfer Trichoplax?

Erik the Outgolfer

well, my money is on admborkbork

Mr. Xcoder

Actually, it might be mınxomaτ.

aditsu

7:18 PM

I'm relatively old too..

Mr. Xcoder

Everything relative is :P

Erik the Outgolfer

admborkbork is 35/36

aditsu

@Mr.Xcoder "Everything is relative" is a line in this song which I remember from when I was little: youtube.com/watch?v=xYA0pkcYIfg

Mr. Xcoder

Yuppe!

mınxomaτ

I'm younger than 25 FTR.

Mr. Xcoder

7:20 PM

@mınxomaτ Just a wild stab, sorry for making you old :P

AdmBorkBork

@EriktheOutgolfer Almost 36. About another month.

mınxomaτ

People who haven't seen me in person tend to think I'm much older.

AdmBorkBork

It's because of your 1337 hacker skillz

Erik the Outgolfer

@mınxomaτ well, I guess you're almost 35 or something?

mınxomaτ

...what

Erik the Outgolfer

7:21 PM

because you "remember a 1988 song from when you were little"

mınxomaτ

1 min ago, by mınxomaτ

I'm younger than 25 FTR.

Erik the Outgolfer

or you just listened to it later?

@mınxomaτ hmm

aditsu

@EriktheOutgolfer that was me, and I wish I was only 35 :p

Erik the Outgolfer

oh

well

Mr. Xcoder

So aditsu should be ≥ Adm?

Erik the Outgolfer

7:23 PM

definitely >

> I wish I was only 35

Mr. Xcoder

Damn that 001...

Erik the Outgolfer

I guess nobody in here would've guessed aditsu is so old already :p

Mr. Xcoder

I had some kind of guess since I know he has relocated to another country sometime in the past.

aditsu

hmm, is the chat history limited? I remember there was one guy older then me, but can't find the relevant messages

Mr. Xcoder

CMC: Find the integer sqrt of an integer.

@aditsu Can't you search for that message?

aditsu

7:27 PM

@Mr.Xcoder CJam: mQ

Erik the Outgolfer

@Mr.Xcoder jelly, 2 bytes: Æ½

aditsu

@Mr.Xcoder that's why I asked if the history is limited

Mr. Xcoder

@aditsu No, the history is not limited.

Erik the Outgolfer

@aditsu I think there are currently bugs related to that

Mr. Xcoder

ಠ_ಠ Pyth, 4 bytes: s@Q2

@_@ It's just amazing how many important overloads @ has in Pyth. @ on lists + ints gets the element at a certain index, on 2 lists it gets the intersection and for integers it returns the nth root.

Thomas Ward

7:31 PM

@Mr.Xcoder Python3, 40 bytes: import math;f=lambda x:int(math.sqrt(x)) (TIO)

Mr. Xcoder

@ThomasWard Why not just lambda k:int(k**.5)?

Thomas Ward

because i'm horrid at golfing :)

newer to golfing, sue me

Erik the Outgolfer

what mr xcoder said

Thomas Ward

that works :P

Mr. Xcoder

@ThomasWard No, I just taught you a new trick tacitly shh. Welcome to PPCG! :P

Erik the Outgolfer

7:33 PM

@ThomasWard well, nobody would probably hire you as a golfer with skills as amazing as yours, if that's even a position ;p

Thomas Ward

:P

Mr. Xcoder

@EriktheOutgolfer I'd much rather encourage Thomas rather than politely criticising him...

J. Salle

@Mr.Xcoder I don't think I ever sent the answer to this so here it is: {∊((∊⊃⍵)=∊⊃⌽⍵)⊆⊃⍵} (probably reinvented the wheel a couple times there ¯\_(ツ)_/¯ )

Mr. Xcoder

Wow, many... Inclusion signs

Thomas Ward

@Mr.Xcoder Thanks to your assist/response, Python 3, 19 bytes (TIO says 21 because i have f=, and i'm not pro at making TIO work with lambdas...); TIO

J. Salle

7:34 PM

most of them are monadic though

Thomas Ward

but i learned something :)

Anonymous

@J.Salle If the wheel was a square :P

Thomas Ward

because I forgot about decimal powers being a thing :p

J. Salle

@Mego maybe a cube?

Erik the Outgolfer

@Mr.Xcoder well, that was referring to his current skills...if he gets to be active in here over time his skills will start to improve, so that's in fact an encouragement ;-)

2

Anonymous

7:35 PM

@Mr.Xcoder √≈

Thomas Ward

@Mr.Xcoder I didn't take it as criticism :)

Mr. Xcoder

@ThomasWard f= is usually not included in the byte count unless the function is recursive, so yours is 19 bytes.

@ThomasWard I was joking nonetheless.

Thomas Ward

@Mr.Xcoder Good to know :)

grrrr too many emails >.<

Erik the Outgolfer

@ThomasWard so that you're not confused

Mr. Xcoder

@ThomasWard Also we usually make it tio-byte-count compatible by putting f= in the header using `f=\`: Try it online!

Thomas Ward

7:37 PM

d'oh

'header'

@Mr.Xcoder As I said, learning more each day :)

Anonymous

For just sqrt, you can shorten it to .5.__rpow__ and drop the lambda bit, but I don't know how to floor it without needing a lambda and thus making it longer

Erik the Outgolfer

@Mego yeah that's why you need a lambda

Mr. Xcoder

Yup flooring ruins everything.

Erik the Outgolfer

unless it's some golfing language which can easily do that

Anonymous

Python needs builtin function composition :/

Mr. Xcoder

7:38 PM

Also Python's __...__ functions are evil.

betseg

^

Thomas Ward

@Mr.Xcoder Thanks to your assist/response, Python 2 and Python 3, 19 bytes; TIO (WITH the header now heh)

Anonymous

int.(.5).__rpow__ would work if . worked for composition

Thomas Ward

@Mr.Xcoder yes, they are. It's especially evil when you're defining them for custom classes...

Erik the Outgolfer

@Mego definitely, it can be useful outside code golf as well

Thomas Ward

7:38 PM

PITA.

@Mr.Xcoder Raising to the nearest int is also equally evil. But usually irrelevant :)

Mr. Xcoder

I am very annoyed by the fact that __import__('module') never saves bytes over from module import* or import module...

AdmBorkBork

Grr, Jelly

Thomas Ward

@Mr.Xcoder fun fact: that works perfectly in Py2 too xD

Mr. Xcoder

@ThomasWard I know, that is supposed to work, but it is ungolfy unfortunately :'-(

aditsu

chat search definitely has some problems..

Thomas Ward

7:41 PM

indeed.

python isn't the best for golfing :P

BUT, i took it as an attempt to learn more :)

Erik the Outgolfer

@J.Salle umm, you can just use a train for 5 bytes: ⌊*∘.5

2

Thomas Ward

so blah.

Mr. Xcoder

@ThomasWard Glad I could help. Maybe solving another CMC would make you learn more?

:D

Thomas Ward

probably. Provided i'm not busy yelling at the FCC.

... for the fifteenth time.

Erik the Outgolfer

why

aditsu

7:43 PM

is there a data query thing for chat?

J. Salle

@EriktheOutgolfer that's not the CMC I was answering

Erik the Outgolfer

@J.Salle but that's where you replied to

Mr. Xcoder

CMC: (I know it is a dupe) Compute the deltas of a given list. (PS: PLS let Thomas solve it if they want to in Python)

Thomas Ward

@EriktheOutgolfer I'm working with a frequency coordinator to get my consulting business a handful of frequencies for our radios when we are deploying on-site for consulting work and spread-out work in a client's locations. They've returned the application twice, even though the Coordinator verified it's valid as an itinerant business. sooo...

HyperNeutrino

Jelly, 4 bytes: _@2\ /s

Mr. Xcoder

7:44 PM

The deltas are the differences between consecutive elements: [1, 2, 5, 3] -> [1, 3, -2]

J. Salle

@EriktheOutgolfer I just noticed that, I used the CMC widget and probably missclicked

AdmBorkBork

Jelly Question -- I have a range [1,2,3,4,5] and a list [0,1,1,0,0] ... how do I get [0,2,3,0,0] from that?

Erik the Outgolfer

×

Mr. Xcoder

@AdmBorkBork Multiplication.

trichoplax

@aditsu There's El'endia's TNBDE but not sure how recently it's been updated. I guess it would work for any older messages though

Anonymous

7:44 PM

@aditsu ppcg.starmaninnovations.com/tnbde/

AdmBorkBork

Thanks!

aditsu

cool, thanks

Mr. Xcoder

When vectorization makes things easier than you might think.

Anonymous

In Actually, that would be ♀*, since * alone is dot product for two lists

Luis Mendo

Why easier? That's the expected result from vectorization, isn't it?

aditsu

7:47 PM

hmm, I'm getting similar results

Mr. Xcoder

@LuisMendo Well vectorization's purpose is making things easier

Erik the Outgolfer

@LuisMendo ...to a newbie in golfing languages stuff is a bit different

Luis Mendo

I guess it's my Matlab background that makes it seem almost obvious :-)

Erik the Outgolfer

well, it's very obvious for me too, from my apl-based background

(mostly jelly)

AdmBorkBork

Jelly control flow is very different from PowerShell control flow.

Pavel

7:50 PM

PowerShell control flow is mostly normal procedural control flow

Mr. Xcoder

Lol numpy deltas are shorter than manual pure python deltas... facedesk my life was a lie

Luis Mendo

Are you using the zip trick?

Mr. Xcoder

@LuisMendo yes of course.

Luis Mendo

Heh. That wasn't obvious to me at all. I saw it here

Erik the Outgolfer

@LuisMendo for those who know python well enough it's pretty obvious

Mr. Xcoder

7:53 PM

@LuisMendo It's friggin' 15 bytes shorter than zip...

Luis Mendo

My Python is rather a little Worm

Mr. Xcoder

Although it is not very helpful otherwise, as you have to create a LC nonetheless and wastes lots of bytes when used repeatedly...

mınxomaτ

@AdmBorkBork I want this to be the first sentence in the Jelly docs.

Anonymous

@LuisMendo Well there's your problem. You're using something from the entire wrong phylum!

AdmBorkBork

Haha

Luis Mendo

7:56 PM

@Mego Hehe. Are they different as much up the tree as phylum? :-O

ATaco

@Mr.Xcoder Funky, 14 bytes a=>a::fold(@-)

Pavel

<-- doesn't know how to make a loop in jelly despite looking it up twice

HyperNeutrino

What type of loop?

Anonymous

@LuisMendo Yep! There are several different worm phyla - Annelida (segmented worms) is probably the most well-known

Pavel

Any loop. Let's say it's a while loop

Erik the Outgolfer

7:57 PM

@Pavel it's easy, the links go to the left of the quick

Mr. Xcoder

@Pavel €, ¿,...

HyperNeutrino

Also in Proton, if zip were to actually work properly, deltas would be way shorter. Instead, it ends up being longer than Python because of the overhead to fix the error ._.

Pavel

@ATaco what is the :: operator doing

Erik the Outgolfer

@Pavel you can see the syntax is <body><condition>¿

Mr. Xcoder

@Pavel While loop is ¿.

ATaco

7:57 PM

@Pavel Works like Lua's : operator.

J. Salle

@LuisMendo if you're talking about earthworms, yes. Pythons are from the phylum Chordata, earthworms are Annelids

Erik the Outgolfer