| --[[ LICENSE | |
| The MIT License (MIT) | |
| Copyright (c) 2016 PC | |
| Permission is hereby granted, free of charge, to any person obtaining a copy | |
| of this software and associated documentation files (the "Software"), to deal | |
| in the Software without restriction, including without limitation the rights | |
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
This is a compiled list of falsehoods programmers tend to believe about working with time.
Don't re-invent a date time library yourself. If you think you understand everything about time, you're probably doing it wrong.
| [life.b -- John Horton Conway's Game of Life | |
| (c) 2021 Daniel B. Cristofani | |
| http://brainfuck.org/] | |
| >>>->+>+++++>(++++++++++)[[>>>+<<<-]>+++++>+>>+[<<+>>>>>+<<<-]<-]>>>>[ | |
| [>>>+>+<<<<-]+++>>+[<+>>>+>+<<<-]>>[>[[>>>+<<<-]<]<<++>+>>>>>>-]<- | |
| ]+++>+>[[-]<+<[>+++++++++++++++++<-]<+]>>[ | |
| [+++++++++brainfuck.org-------->>>]+[-<<<]>>>[>>,----------[>]<]<<[ | |
| <<<[ | |
| >--[<->>+>-<<-]<[[>>>]+>-[+>>+>-]+[<<<]<-]>++>[<+>-] |
| ∇ solvePart1 { | |
| ⍝ Construct a 2-column array with the first column being the command | |
| ⍝ and the second being the distance. | |
| list ← ⊃ {(d n) ← ⍵ ⊂⍨ ⍵≠↑" " ◊ d (⍎n)}¨ io:read "/home/elias/prog/advent-of-code2021/part02.txt" | |
| ⍝ Convert each direction instruction into a vector (up, down or right) | |
| directions ← { ⊃ ((0 1) (¯1 0) (1 0))[(⊂¨ "forward" "up" "down") ⍳ ⊂⍵] }¨ list[;0] | |
| ⍝ Multiply each direction with the distance and sum the results | |
| ⍝ and finally multiply the individual values |
The fork of Ruby that I developed this project in can be found here: https://github.com/rm155/ruby/tree/Ractor-Local-GC-version-1
Ruby 3.0 introduced Ractors, a feature that enables true concurrency in the language. By allowing different pieces of code to run at the same time, the execution time of program can be greatly reduced. However, when multiple processes work on the same data concurrently, it can lead to data race conditions, which cause the program to behave unpredictably. Because of this, Ruby heavily restricts the use of shared data between Ractors.
In my 2021 GSoC project, I helped modify existing Ruby libraries to be compliant with Ractor rules. The purpose of this was to make the functionality of those libraries usable within Ractors. After the project, I continued to work with Ractors, and I found that Ractors were not providing as much of a speedup as one might have expected. I a
