kotlinlang #advent-of-code

kinda surprised so many people say the regex was the most natural, anytime a problem is trivially solvable using string split I'd always consider that the easiest solution

👆 1

1 reply · 2 participants

asad.awadia

12/02/2020, 4:01 PM

regex is the git of string manipulation

3 replies · 4 participants

Nir

12/02/2020, 4:26 PM

🤷 prefer the principle of least power. I also prefer to avoid regex for code whose performance I may care about; i guess right now the AOC challenges are very small anyway but it won't stay that way

3 replies · 3 participants

Nir

12/02/2020, 5:04 PM

In the python slack, they setup a thread for people to post their solutions (they actually have multiple threads, part1 and part2, and potentially a third thread for people who want to post both together), could have something like that here

➕ 1

2 replies · 3 participants

Nir

12/02/2020, 5:24 PM

⚠️ Day 2 Solution Thread - here be spoilers ⚠️

25 replies · 5 participants

Jérôme Gully

12/02/2020, 6:22 PM

Day2 solution here: https://github.com/Nutriz/AdventOfCode2020/blob/master/src/test/kotlin/Day2.kt This year I try to use the Unit Test approach, I never really used it. But it's a lot of code compared to yours solutions 🙃. Solution code after all tests.

👌 1

2 replies · 2 participants

bjonnh

12/03/2020, 3:00 AM

I'm playing with the advent from 2015 ((I never did one before).

1 reply · 2 participants

Jakub Gwóźdź

12/03/2020, 8:25 AM

⚠️ Day 3 Solution Thread - here be spoilers ⚠️

96 replies · 9 participants

Nir

12/03/2020, 3:35 PM

It's not really a matrix of strings, is it?

19 replies · 4 participants

bjonnh

12/03/2020, 3:36 PM

yes

1 reply · 2 participants

adamratzman

12/04/2020, 4:58 AM

⚠️ Day 4 Solution Thread - here be spoilers ⚠️

41 replies · 6 participants

David Whittaker

12/04/2020, 5:25 AM

That was crazy - but gotta love me that

when

statement!!

😂 1

3 replies · 2 participants

David Whittaker

12/04/2020, 5:32 AM

I messed up the first part since my logic didn't include the last line (it calc'd on a newline) so I had an off-by-one error. So I just added an arbitrary newline to the file. 😎

1 reply · 1 participant

adamratzman

12/04/2020, 5:33 AM

You just have to split the input by \n\n, and split each of those by space or newline

7 replies · 2 participants

adamratzman

12/04/2020, 5:36 AM

As well as range checks with chars

💯 2

9 replies · 2 participants

todd.ginsberg

12/04/2020, 3:18 PM

I did mine entirely with regular expressions.

12 replies · 4 participants

Nir

12/04/2020, 3:37 PM

Today's AOC inspired idea for a utility function:

fun String.popSuffix(suffix: String) = if (endsWith(suffix)) removeSuffix(suffix) else null

4 replies · 2 participants

adamratzman

12/04/2020, 3:57 PM

I was also thinking extension function String.isInt

2 replies · 2 participants

Nir

12/04/2020, 4:29 PM

They can't really have things like ':' in the string without additional conditional constraints

2 replies · 2 participants

pavi2410

12/04/2020, 6:05 PM

Any idea why the output is 1? (The output is definitely not 1; it's 267 or so) Is it an issue with

*.ws.kts

files? Any limitations I'm not aware of?

5 replies · 2 participants

Edgars

12/04/2020, 6:52 PM

What did you guys do with regards to parsing multiple lines as one passport, what with the blank line?

57 replies · 4 participants

bjonnh

12/04/2020, 6:53 PM

(please try to keep the discussions in the thread to not spoil)

1 reply · 2 participants

adamratzman

12/04/2020, 7:19 PM

I wrote a

List<T>.chunkedBy

function that some people might find useful

4 replies · 2 participants

adamratzman

12/04/2020, 7:20 PM

Example (contains spoilers)

1 reply · 1 participant

adamratzman

12/05/2020, 4:26 AM

⚠️ Day 5 Solution Thread ⚠️

64 replies · 12 participants

David Whittaker

12/05/2020, 5:41 AM

What in the world do you think this is going to be?

🤷‍♂️ 2

3 replies · 3 participants

adamratzman

12/06/2020, 4:51 AM

⚠️ Day 6 Solution Thread ⚠️

88 replies · 12 participants

bjonnh

12/06/2020, 4:57 AM

🕙

3 replies · 2 participants

Kroppeb

12/06/2020, 5:12 AM

I accidentally misread part 1 and solved part 2 instead. Which makes part 2 more hillarious

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1 reply · 2 participants

Kroppeb

12/06/2020, 5:20 AM

I didn't expect there to be another puzzle where we had to split on emptylines agian. I guess I should have made that

SplitOn{}

I was thinking about

33 replies · 4 participants

Title

Kroppeb

12/06/2020, 5:20 AM

I didn't expect there to be another puzzle where we had to split on emptylines agian. I guess I should have made that

SplitOn{}

I was thinking about

adamratzman

12/06/2020, 5:20 AM

I just used \n\n again 😄

bjonnh

12/06/2020, 5:21 AM

I mean that's fast and you don't have to remember what you named your function

Kroppeb

12/06/2020, 5:22 AM

Yeah but I get my input as a list of strings

I guess I have a function that returns a string

But using

\n\n

wont work on windows, so idk

bjonnh

12/06/2020, 5:23 AM

why do you get your input as a list of strings?

Kroppeb

12/06/2020, 5:24 AM

adamratzman

12/06/2020, 5:24 AM

\r\n\r\n @Kroppeb

Kroppeb

12/06/2020, 5:25 AM

because I have a bunch of functions that parse the inputs

bjonnh

12/06/2020, 5:25 AM

I have two helper functions textFile(filename) and linesFile(filename) that give me either the file as a full text, or lines

Kroppeb

12/06/2020, 5:25 AM

well my solution is shorter

bjonnh

12/06/2020, 5:26 AM

you can probably tell intelliJ or whatever your editor is to use \n for line returns

so when you make the file you get \n

Kroppeb

12/06/2020, 5:26 AM

although i use curl to download my input

bjonnh

12/06/2020, 5:26 AM

so you should have \n then

Kroppeb

12/06/2020, 5:27 AM

Lost about 30 points a year ago because intellij droped the ending whitespace

See i don't want to have to think about line endings

And split on might be useful for other things too

bjonnh

12/06/2020, 5:28 AM

sure sure

I'm not a windows person so that's not something I really care about

but I should keep that in mind with windows users sending files around

adamratzman

12/06/2020, 5:30 AM

good points

Kroppeb

12/06/2020, 5:30 AM

anyway, with reduce and splitOn, i now have a "oneliner" for each day

part 2 uses

instead

.e()

converts to a

List<Char>

bjonnh

12/06/2020, 5:32 AM

oh I was going to ask

why do you need that?

Kroppeb

12/06/2020, 5:32 AM

you can't convert a string to a set

ok, intellij was autocompleting too slow so i thought you couldn't

bjonnh

12/06/2020, 5:33 AM

great I'm stealing your sumby

👆 1

never think about that one

Jakub Gwóźdź

12/06/2020, 5:52 AM

Go with sequences my friends 🙂

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