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.

Alas, this leaks a and i into the global scopes, which is a violation of our rules. Still, it's a pretty interesting feat.

Yeah, so, bonus points for those who manage to avoid leaks.

I tried, but my non-leaking version can only "encrypt" 110 characters:

eval("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx".replace(/./g,function(a){return String.fromCharCode((a.charCodeAt(0)&255))}))

95 × 2 = 190 bytes:

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

Github doesn't allow me to post the comment with encoded string, but I actually tried to tweet that, it works :-)

subzey, you're a genius! Thanks a lot and congrats!
I actually tried to use escapes and unescapes too, but it didn't work.
Turns out, it was just the .replace(/uD./g,'') that was missing!

I made a demo for your solution: http://jsfiddle.net/99GVk/1/ - with a dedicated encoder (128 chars)

@subzey, I made it to 198!

eval(escape("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx").replace(/%.../g,'\\u00'))

Uh… Very nice try, but unfortunately, there's an error.

I tried the following:
alert("It works!");;;;;/* … more semicolons fills up to 198 chars*/
and after running the generated code got SyntaxError.

In short, var \u0066\u006f\u006f = 42 would work, but var \u0066\u006f\u006f \u003d 42 wouldn't. Please see http://es5.github.io/#x7.6 for details.

oops indeed I should have tested it better... :(

Hi there !

My 2 cents : (2 chars less)

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

Thanks nick! (warning, your "f" leaks in the global scope)