https://github.com/michaeladler/aoc-2020

My solutions for the Advent of Code 2020
https://github.com/michaeladler/aoc-2020

advent-of-code advent-of-code-2020 aoc aoc2020 lua

Last synced: 18 days ago
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My solutions for the Advent of Code 2020

• Host: GitHub
• URL: https://github.com/michaeladler/aoc-2020
• Owner: michaeladler
• License: apache-2.0
• Created: 2022-03-24T17:11:01.000Z (almost 3 years ago)
• Default Branch: main
• Last Pushed: 2022-03-24T21:33:55.000Z (almost 3 years ago)
• Last Synced: 2024-11-08T01:45:06.274Z (2 months ago)
• Topics: advent-of-code, advent-of-code-2020, aoc, aoc2020, lua
• Language: Lua
• Homepage:
• Size: 193 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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# AoC 2020

My second [Advent of Code](https://adventofcode.com/2020) event.

This year I used [LuaJIT](https://luajit.org/).

## Lessons Learned

* LuaJIT is amazingly fast (the fastest scripting language as of 2020)

* [luaprompt](https://github.com/dpapavas/luaprompt) is great for rapid prototyping

* Lack of 64-bit integers in LuaJIT can be a problem

  **Workarounds**:

    * use a shared library (e.g. written in C) and use LuaJIT's awesome FFI.

    * use Lua 5.4 which is quite fast too

* It is rather annoying that tables cannot be used as keys in other tables; use hacks like `string.format` to serialize the table and use it as a key

* Lua's default behavior to return `nil` instead of an out-of-bounds error for accessing non-existing table keys is *great*

* [Penlight's](http://stevedonovan.github.io/Penlight/api/index.html) most useful feature was the `__tostring` implementations for tables (which helped a lot in the REPL)