Linear Feedback Shift Register implementation

README.md

LFSR-golf

An implementation of Linear Feedback Shift Register based pseudo-random sequence generator in 120 bytes of JavaScript.

Usage

LFSR(length,seed)

e.g.

LFSR(865,1567)

will generate a sequence 865 bytes long from the seed 1567 and return a raw JS string containing it.

index.js

function(l,f,s,r){for(r=s="",l*=8;l--;)l&7?s=s<<1|(f=f>>1^(f&1&&0x80000057))&1:(r+=String.fromCharCode(s),s=0);return r}

LICENSE.txt

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2013 plugnburn

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. You just DO WHAT THE FUCK YOU WANT TO.

package.json

{
  "name": "LFSR",

  "description": "Linear Feedback Shift Register PRNG",

  "keywords": [
    "LFSR",
    "random",
    "generator",
    "number",
    "sequence"
  ]
}

You can use coercion to initialize s and save 2 bytes:

function(l,f,s,r){for(r=s="",l*=8;l--;)l&7?s=s<<1|(f=f>>1^(f&1&&0x80000057))&1:(r+=String.fromCharCode(s),s=0);return r}

Well, thanks.

You're welcome :)