Advent of Code 2021 day 2 🧵

Why does IJ says the result is always zero? The variables get updated in the code that's hidden

Advent of Code 2021 day 3 🧵

If one of y'all makes a Kotlin private leaderboard, please send me the code. I'd love to join to virtually meet others in the community and help keep up the momentum! K 🎄 ❤️

Can someone help me with today's second puzzle? I'm having some trouble with comprehending it blob smile

If anyone is still looking for a painless AOC2021 workspace to dive straight to coding, look no further - https://github.com/mpetuska/aoc-2021-kmp Comes packed with testing framework, test inputs, execution time measurements and validation. Oh and it runs on ALL kotlin targets, which allows you to compare how your solution performs under different runtimes (GH actions included if you don't have 3 laptops) :D All you need to do is implement a single method for each day with your solution.

Advent of Code 2021 day 4 🧵

isn't there a way to continuously ask sequence for any number of items?

Advent of Code 2021 day 5 🧵

I made a visualization for Day 5: https://streamable.com/weice8

Advent of Code 2021 day 6 🧵

Advent of Code 2021 day 7 🧵

Advent of Code 2021 day 8 🧵

At least we’ll have this race once Formula 1 ends this weekend…

btw, this happened during my coding today, and I have no idea why the compiler trips:

kotlinx.benchmark doesn't work with Kotlin/Native (at least not in recent versions of Gradle & Kotlin) nor JS IR, but the difference between JS (legacy) and JVM results is unbelievable. https://ephemient.github.io/aoc2021/jmh-visualizer/index.html

Advent of Code 2021 day 9 🧵

This worked fine. Coming from python, my natural instinct to extend this for two years was, I created a folder called 2020, and a folder called 2021, and had the same stuff in each one. The problem is that kotlin packages aren't intrinsically hierarchical. So if I have a file called day1.kt in both the 2020 and 2021 folder, and they both have package day1 at the top, and both define same function names, it starts complaining about duplicate function definitions

Quick question: Do you think it’s cheating to have a large number of utility functions prepared? I think that in a way it is. Difficult to say! To me AoC is about finding a good solution from scratch using only what comes with the language, but then again templates are probably fine. Not sure where to draw a line …

Is there a particular reason Kotlin doesn't have integer exponentiation? Seems a bit odd to me tbh

Advent of Code 2021 day 10 🧵

I am once again asking for a standardized SealedMap implementation like an EnumMap

Anyone else been caught a couple times by Kotlin's 32 bit integer default? smh

Advent of Code 2021 day 11 🧵

Advent of Code 2021 day 12 🧵

Advent of Code 2021 day 13 🧵

with the printing of the ouput taking in mind; what monospaced font do you guys use (if any)? 🙂

Since many of you seem to like 100%-functional, all-in-one-solutions: I have really a hard time understanding those 20-to-30-line-functions with deeply nested lambdas without the help of an IDE. I have to keep track of a whole stack of receivers and inferred data types ... most of the time, I get lost half way through it. I'm a TDD-developer, leaning more to the clean-coders-approach with very small, easy-to-understand functions and well defined in- and out-data-types. After creating a test first (which is a template for this contest), I write a really crappy imperative solution to get the correct answer fast. After that, during the refactoring phase, I do all the extractions and renamings, finally converting everything to functional. What do you think, is this a bit over-engineered for these kind of contests?

Advent of Code 2021 day 14 🧵

1. A simple histogram of elements given a list of stuff. I end up doing this usually

some_stuff.groupBy { it }.mapValues { it.value.size }

Which works but feels a bit silly from a couple of angles