https://github.com/raganwald/fractran

Code to accompany “ Remembering John Conway's FRACTRAN, a ridiculous, yet surprisingly deep language”
https://github.com/raganwald/fractran

conway fractran mathematics

Last synced: 3 months ago
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Code to accompany “ Remembering John Conway's FRACTRAN, a ridiculous, yet surprisingly deep language”

• Host: GitHub
• URL: https://github.com/raganwald/fractran
• Owner: raganwald
• License: mit
• Created: 2020-04-19T13:11:40.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2020-05-07T21:19:04.000Z (about 5 years ago)
• Last Synced: 2025-03-20T14:48:10.861Z (3 months ago)
• Topics: conway, fractran, mathematics
• Language: JavaScript
• Homepage: http://raganwald.com/2020/05/03/fractran.html
• Size: 30.4 MB
• Stars: 10
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# FRACTRAN

![John Horton Conway at the blackboard](assets/Conway_1k.jpg)

A FRACTRAN interpreter, in honour of [John Horton Conway](https://www.math.princeton.edu/people/john-conway).

### setup and running the examples

Prerequisites:

- A recent-ish installaction of node.

- Babel (if you prefer) https://babeljs.io/docs/en/usage

Installing Babel to compile ES-whatever to node-whatever:

```bash

npm install --save-dev @babel/core @babel/cli @babel/preset-env

npm install --save @babel/polyfill

```

Print an infinite list of primes using a big integer implementation:

```bash

npx babel src --out-dir lib && node ./lib/integer-primes.js

  => 2

     3

     5

     7

     11

     13

     17

     19

     23

     29

     ...

```

Or limit the number of primes:

```bash

npx babel src --out-dir lib && node ./lib/integer-primes.js 7

  => 2

     3

     5

     7

     11

     13

     17

```

Or compute an arbitrary fibonacci number:

```bash

npx babel src --out-dir lib && node ./lib/integer-fib.js 7

  => fib(7) = 13

```

## More...

[![Building Fizzbuzz in Fractran from the Bottom Up](assets/compiling-to-fractran.png)](https://malisper.me/building-fizzbuzz-fractran-bottom/)

[![HashLife, in the browser](assets/raganwald-hashlife.png)](http://raganwald.com/hashlife/)

[![Gosper’s HashLife in Literate CoffeeScript](assets/cafe-au-life.png)](https://github.com/raganwald/cafeaulife)