A general-purpose functional golfing language. Tutorial
To install Arn you must have Node.js installed on your system. Once installed, run
sh
npm install -g arn-language
You can then run the command
sh
arn run PATH
to run a file as an Arn program. You can also pass extra arguments to pass some user input to the program (example below). Use arn help to get a full list of commands/flags.
sh
arn run PATH 5 "Hello, World!"
Would pass two lines of input to the program, one with a 5, and one with the string Hello, World!
First, ensure Rust is installed on your system and that these requirements are fulfilled.
You can either build from source by cloning the repository and then running
cargo install --path path/to/repository
for the latest features, or by simply running
cargo install arn-language
for the current release edition
Arn is a golfing language; that is, it is designed to perform tasks in as few bytes as possible. It draws heavy inspiration from J/APL
Arn is constructed of variable declarations, functions, and symbols. These symbols come in the forms of prefixes, infixes, and suffixes. A full syntax and description can be found at this page. This format, however, may lead to instances where your program needs to be a few bytes shorter in order to compete. This is where Carn (Compressed Arn) comes in.
Carn is the compressed version of Arn. The interpeter has the ability to distinguish between these two program formats and interpret each separately, without any input from the user. Carn is encoded using its own Code Page, based on CP1252. It can be found below. The Arn interpreter will compress your program by passing in the -c flag to the compiler through the command line.
| _ | _0 | _1 | _2 | _3 | _4 | _5 | _6 | _7 | _8 | _9 | _A | _B | _C | _D | _E | _F |
| :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---:
| 0_ | ! | " | # | $ | % | & | ' | ( | ) | * | + | , | - | . | / | 0 |
| 1_ | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | : | ; | < | = | > | ? | @ |
| 2_ | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P |
| 3_ | Q | R | S | T | U | V | W | X | Y | Z | [ | \ | ] | ^ | _ | ``|
| **4** |a|b|c|d|e|f|g|h|i|j|k|l|m|n|o|p|
| **5** |q|r|s|t|u|v|w|x|y|z|{|||}|~|¡|¢|
| **6** |£|¤|¥|¦|§|¨|©|ª|«|¬|®|¯|°|○|■|↑|
| **7** |↓|→|←|║|═|╔|╗|╚|╝|░|▒|►|◄|│|─|┌|
| **8** |┐|└|┘|├|┤|┴|┬|♦|┼|█|▄|▀|▬|±|²|³|
| **9** |´|µ|¶|·|¸|¹|º|»|¼|½|¾|¿|À|Á|Â|Ã|
| **A** |Ä|Å|Æ|Ç|È|É|Ê|Ë|Ì|Í|Î|Ï|Ð|Ñ|Ò|Ó|
| **B** |Ô|Õ|Ö|×|Ø|Ù|Ú|Û|Ü|Ý|Þ|ß|à|á|â|ã|
| **C** |ä|å|æ|ç|è|é|ê|ë|ì|í|î|ï|ð|ñ|ò|ó|
| **D** |ô|õ|ö|÷|ø|ù|ú|û|ü|ý|þ|ÿ|Œ|œ|Š|š|
| **E** |Ÿ|Ž|ž|ƒ|ƥ|ʠ|ˆ|˜|–|—|‘|’|‚|“|”|„|
| **F** |†|‡|•|…|‰|‹|›|€|™|⁺|⁻|⁼|⇒|⇐|★|Δ` |
:= and compressed strings (changes to :=)