Challenge: Executing more than 140 JS characters in a tweet!

README.md

Hello

This fork isn't really a 140bytes entry, but a challenge!

What if a tweet (140 utf-16 characters) could execute more than 140 characters of JavaScript code?

190 chars:

thanks to subzey's help, a tweet can execute 190 js chars.

Encoder:

z=function(b,c,a,f){c="";f=String.fromCharCode;for(a=0;190>a;a+=2)c+=f(55296+b.charCodeAt(a))+f(56320+b.charCodeAt(a+1));return c}

Decoder / Executer (140 chars): (replace xxxx with your encoded JS string)

eval(unescape(escape("xxxx").replace(/uD./g,'')))

Demo:

http://jsfiddle.net/99GVk/1/

annotated.js

// Encoder:
// @param b: the input code (198 chars)
z = function(b, c, a, f){
  
  // The encoded string begins with "'"
  c = "";
  
  // Shortcut
  f = String.fromCharCode;
  
  // Loop through the input code
  for(a = 0; 190 > a; a += 2){
    
    // Create and append an UTF-16 surrogate pair, containing the ASCII codes at b[a] and b[a+1] in each half's last 7 bits
    c += f(55296 + b.charCodeAt(a)) + f(56320 + b.charCodeAt(a + 1));
  }
  
  // return the encoded string
  return c
}

LICENSE.txt

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

 Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>

 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.