FRACTRAN

A FRACTRAN interpreter, in honour of John Horton 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:

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:

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:

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:

npx babel src --out-dir lib && node ./lib/integer-fib.js 7
  => fib(7) = 13

More...