aemkei / jsfuck Goto Github PK

So I just came here from the Low Level JavaScript YouTube video on JSFuck which left me wondering if anyone has managed to write a self-hosting JSFuck compiler that actually runs.

Technically it's simple of course: just pipe a JSFuck compiler through itself. But I wondered if the output would actually run.

Searching for that on-line turned up nothing (honestly, I refuse to believe nobody has tried - surely it must be my own weak Google-Fu). So I gave it a quick shot myself. First I tried running a minified version of this repo's compiler through itself results in 6408898 chars, so roughly 6.1 MiB. Crashed any browser console I tried it on.

Then I figured the issue must be the size, so I took the demo code from the video that brought me here, code golf a bit (leading to the version in the details below below), minify that (resulting in 877 chars), and throw that through various JSFuck compilers. When compiling itself it creates a 5.1 MiB file. When using the online compiler (which clearly is a bit smarter) the result is 1.5 MiB. Still crashes :(

At this point I'm not sure if it's the size or something else, but honestly I should be doing other things right now so I can't investigate further at the moment.

Curious if anyone out there has tried or maybe even succeeded in this?

const compile = (() => {
  const N = n => {
    if (n === 0) return '+[]';
    return Array.from({ length: n }, () => '+!![]').join(' + ');
  }

  const M = {};

  const S = s => s.split('').map(x => {
    return M[x] || `([]+[])[${S(c)}][${S('fromCharCode')}](${N(x.charCodeAt(0))})`;
  }).join('+');

  // "[object Object]"
  const O = '({}+[])[';
  const c = 'constructor';
  const t = {};

  M.a = `(+{}+[])[${N(1)}]`;
  M.b = O + N(2) + `]`;
  M.o = O + N(1) + `]`;
  M.e = O + N(4) + `]`;
  M.c = O + N(5) + `]`;
  M.t = O + N(6) + `]`;
  M[' '] = O + N(7) + `]`;
  M.f = `(![]+[])[${N(0)}]`;
  M.s = `(![]+[])[${N(3)}]`;
  M.r = `(!![]+[])[${N(1)}]`;
  M.u = `(!![]+[])[${N(2)}]`;
  M.i = `((+!![]/+[])+[])[${N(3)}]`;
  M.n = `((+!![]/+[])+[])[${N(4)}]`;
  t.c = "([]+([]+[])["+S(c)+"])["
  M.S = t.c+N(9)+"]";
  M.g = t.c+N(14)+"]";
  M.p = `([]+(/-/)[${S(c)}])[${N(14)}]`;
  M['\\'] = `(/\\\\/+[])[${N(1)}]`;
  t.S = `)[${S('toString')}](`;
  M.d = `(${N(13)}`+t.S+`${N(14)})`;
  M.h = `(${N(17)}`+t.S+`${N(18)})`;
  M.m = `(${N(22)}`+t.S+`${N(23)})`;
  M.C = `((()=>{})[${S(c)}](${S('return escape')})()(${M['\\']}))[${N(2)}]`;

  return p => `(()=>{})[${S(c)}](${S(p)})()`;
})();

No site jsfuck.com o caractere '[' é representado como '(GLOBAL+"")[0]'
Isso está quebrando no NODEJS.
O estranho é que no site está diferente do GITHUB, pois o GIT está '[': '(Function("return{}")()+"")[0]'
Esse sim não dá erro no NODEJS.
O problema de usar o "return this" no nodejs é que ele não possui esse objeto nativamente, e mesmo utilizando o módulo JSDOM, as versões mais antigas não possuem suporte ao objeto "window.this"

In http://www.jsfuck.com/ I type this source A:

[1,2][1]

and select "Eval source" and push "Encode" button.

I get source B (long - I put it at the bottom of this post)

When I paste source A to chrome console I get result: 2
When I paste source B to chrome console I get result: undefined

It look's like it is bug or I do something wrong... - what to do?
(without "Eval source" problem is the same)

[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]][([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]](([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]][([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]((!![]+[])[+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+!+[]]+(+[![]]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+!+[]]]+(!![]+[])[+[]]+(+(+!+[]+[+[]]+[+!+[]]))[(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+(+![]+([]+[])[([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(+![]+[![]]+([]+[])[([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]])[!+[]+!+[]+[+[]]]](!+[]+!+[]+[+!+[]])[+!+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]+!+[]])()+[])[+[]]+[+!+[]]+[[]][([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]([[]])+[]+[!+[]+!+[]]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]][([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]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[]+!+[]+[+!+[]])[+!+[]]+(!![]+[])[!+[]+!+[]+!+[]])()(([]+[])[([![]]+[][[]])[+!+[]+[+[]]]+(!![]+[])[+[]]+(![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+([![]]+[][[]])[+!+[]+[+[]]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]]()[+[]])[+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]]+([][[]]+[])[!+[]+!+[]]))()

The developer tool can directly print out the source code, and execute the following code in the developer tool.
Decryption method:

let func = [][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]][([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]((![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]+(!![]+[])[+[]]+(![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[!+[]+!+[]+[+[]]]+[+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[!+[]+!+[]+[+[]]])
console.log(func)

Output code

ƒ anonymous(
) {
alert(1)
}

eval(JSFuck.encode('console.log(0)',1))

prints 0
but

eval(JSFuck.encode('console.log(0)\nconsole.log(1)',1))

throws an exception
that's because '\n' isn't encoded

In escapeSequence(),characters whose charCodes is under 256 will turn into ascii code.
However, it works well if we treat it as utf-16. Both "\141" and "\u0061" represent "a".

Is

if (cc < 256) { 
     return '\\' + cc.toString(8); 
} 

a necessary statement?

Basically the title

Hi there,

I just discovered this project after I made my own implementation of a Javascript compiler into "six characters". It's interesting to compare our implementations, which are quite close actually.

The main difference is for the encode script. Here is mine :

app.encode = function(input){
        var charcodes = [];
        for(var c=0; c<input.length; c++){
            charcodes.push( app.convertInt( input.charCodeAt(c) ) );
        }
        var out = "[]+" + charcodes.join("+"+app.convertTable["f"]+"+");
        out = "[]+(" + out + ")["+_("split")+"]("+app.convertTable["f"]+")";
        out = _("return ") + "+" + app.convertTable["String"] + "+" + _(".fromCharCode(") + "+(" + out +")+" + _(')');
        out = app.eval(out);
        out = app.eval(out);
        return out;
    };

So i just convert all the input into charCodes and then interprate them with String.fromCharCode(c1,c2,c3,c4...)

For small scripts, your encoder makes file size smaller, but the performance and the script size is far better for large scripts with my approach.

Here is my version: http://syllab.fr/projets/experiments/sixcharsjs/
and the source : http://syllab.fr/projets/experiments/sixcharsjs/js/main.js

Unfortunately I wrote all the explainations in French.

The examples in the Basics section of the documentation here as well as the main site show the Array.filter function being used even though the code has been updated to use Array.flat instead.

On npm is available only the first version.

I have to install from github version 0.3.0

As far as I know, eval("0") is 0. However, I must write "return 0;" instead of "0" when I want to get Number 0 for the return. Same for any expression like /0-9A-Za-z/g. If it is not intended, this is not an exact eval().

I suggest for eval:

[]["filter"]["constructor"]("return eval(CODE)")()

Any method is good to know.
I'm considering using this in production env.

i have a script that basically checks

someVariable === undefined && etc...

When i convert it to jsfuck and run it and then the browser it gives error because it is read as:
someVariable === && etc...

false => ![]

not to

(![]+[])[+[[+[]]]]+(![]+[])[+[[+!+[]]]]+(![]+[])[+[[!+[]+!+[]]]]+(![]+[])[+[[!+[]+!+[]+!+[]]]]+(!![]+[])[+[[!+[]+!+[]+!+[]]]]

etc

Suppose I have some string and want to use function "replace"

"truefalse"["replace"]("true") --> "undefinedfalse"

this line can be easily converted to JSF without using any kind of eval (interpreting string as code) as follows (I use comments and new lines to increase readability)

// "truefalse"[
([]+!![]+![])[

// long 'replace' word:
[]+(!![]+[])[+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(+(!+[]+!+[]+[+!+[]]+[+!+[]]))[(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+([]+[])[([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]][([][[]]+[])[+!+[]]+(![]+[])[+!+[]]+((+[])[([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]+[])[+!+[]+[+!+[]]]+(!![]+[])[!+[]+!+[]+!+[]]]](!+[]+!+[]+!+[]+[+!+[]])[+!+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]

// ]("true") 
]([]+!![])

Questions:

1. It is possible to call function replace with 2 arguments - Like that: "truefalse"["replace"]("true","1") and write it in similar way in JSF (without any kind of 'eval')? I have/see problem with comma which separate arguments... :(

2. It is possible to write in similar way regular expression in replace function argument e.g."truefalse"["replace"](/e/g,"E") (without any kind of 'eval') (we want to change e to E in whole string) ? (here I have/see problem with slash I don't know how to "construct" them in JSF to be interpreted as regexp

Hi,

You JSFuck compiler is very interesting however it has some drawback - it produce very large code from small code JS :( . So I have following idea:

1. Lets Compress our STRING with CODE by switch it to base4 (not 64!) characters, however instead using character 0,1,2,3 we change '3' to letter 'a' becouse in brainfuck letter 'a' is shorter than '3' representation:

var input = "alert('Hello world' + \x22 in 2018! :) \\uC548\\uB155\\uD558\\uC138\\uC694 \x22)"; // our input program as STRING (we can only use code which use ASCII character - for utf8 characters we need to use escape characters as in this example)

// code string
var encode = function(input) {
    let output = ""
    input.split('').map(function(letter) {
    let c =letter.charCodeAt(0).toString(4).split('3').join('a');
    if(c.length==3) c="0"+c;
    if(c.length==2) c="00"+c;
    if(c.length==1) c="000"+c;
    if(c.length==0) c="0000";
    output = output + '' + c;    
}) 
return output;
};

var code = encode(input);

Ok so in variable 'code' we get following value (remeber number '3' in our base4 we change to letter 'a'):

120112a012111a021a100220021a1020121112a012a012aa02001a1a12aa1a0212a01210021a0200022a020002020200122112a202000a020a000a010a20020102000a220221020011a01a11100a0a110a100a2011a01a1110020a010a110a1111a01a1110100a110a110a2011a01a11100a0a010a0a0a2011a01a11100a0a120a210a10020002020221

2. Then we put this string in our decoding/eval procedure:

var b='',c = "120112a012111a021a100220021a1020121112a012a012aa02001a1a12aa1a0212a01210021a0200022a020002020200122112a202000a020a000a010a20020102000a220221020011a01a11100a0a110a100a2011a01a1110020a010a110a1111a01a1110100a110a110a2011a01a11100a0a010a0a0a2011a01a11100a0a120a210a10020002020221";c.split('').map(function(d,i){if(i%4==3) {b=b+String.fromCharCode(parseInt(c.slice(i-3,i+1).split('a').join('3'),4));}});eval(b);

and thats all - we can put this code to our JSFuck compiler and it works (produce 150885 chars) :)

3. Tests

a) let say our js ode is alert(1) then clear JSFack produces 1227 chars and after our 'compresion' we get 148563 chars (~150KB - this is approximation of size of our compresion 'library')

b) if we add lets say 50 characters alert('1abcdefgh iklmnoupr stuvwyzx12 abcdefghi klmnouprs') then pure JSFack result increases to 39465 chars - so 39465-1227=38238bytes ~39KB growth compare to case a). If we use compression we get 150635 chars so 150635-148563=2072bytes ~2KB growth compare to case a). So as we see our output code increase more thant 10 times ( !!!!!!!! ) without compression (excluding 'compress library size').

4. When I try to compile larger compresed code i get following error (index):162 Uncaught RangeError: Maximum call stack size exceeded at HTMLAnchorElement.$.onclick... - however I think If you build in this technique directly to compiler it will be easy to avoid this error.

When trying to encode the string "undefined", it encodes it as [[][[]]]+[]

However, this is wrong, because [[][[]]] evaluates to [undefined] and when converting this to string by +[], then it results in ""

I think it should either get the first element by [+[]] and then converting to string, so the result should be: [[][[]]][+[]]+[], or better yet, not wrap undefined into an array, by getting it to [][[]]+[]

I don't know if anyone has said that, but this gives the result P.

([]["isPrototypeOf"] + "")[11]

JS source:

([]+window)[13]

JSFuck source (with eval source):

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