JSFuck Description Document

jsfuck.js

// JSFuck

// Gaining access to letters

// The way to gain access to a letter is to use arrays to get a letter.
"abc"[0] === "a"

// Strings
[]+[] // ""
// adding +[] to the end makes it a string.

[][[]]+[] // undefined
/* Letters gained: d,e,f,i,n,u */
++[][[]]+[] // NaN
/* Letters gained: N,a */
![]+[] // false
/* Letters gained: l,s */
!![]+[] // true
/* Letters gained: r,t */


// Numbers
+[]+[] === '0'
+![]+[] === '0'
+!![]+[] === '1'
[+!![]] === [ 1 ]
[+!![]]+[+![]] === '10'

// getting access to letters
// current letters: N,a,d,e,f,i,l,n,r,s,t,u

// Getting the letter 'N'
'NaN'[0]
(++[][[]]+[])[+[]]
// Getting the letter 'd'
'undefined'[2]
([][[]]+[])[+!![]+!![]]

'undefined'[5]
([][[]]+[])[+!![]+!![]+!![]+!![]+!![]]

// Constructing the word 'die'
([][[]]+[])[+!![]+!![]]+([][[]]+[])[+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]+!![]+!![]]

// Getting more characters using Array.prototype.find

[]["find"]+[] === 'function find() { [native code] }'

/* Letters gained: c,o,v */

// current letters: N,a,c,d,e,f,i,l,n,o,r,s,t,u,v

// Getting 'Infinity'
+("1e309") // Infinity
+("1e309")+[] // "Infinity"
+((+!![])+(!![]+[])[+!![]+!![]+!![]]+([+!![]+!![]+!![]])+(+[])+(+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]))+[] // 'Infinity'

// Letters gained: I, y

// current letters: I,N,a,c,d,e,f,i,l,n,o,r,s,t,u,v,y


// More letters

0["constructor"]+[] === 'function Number() { [native code] }'
""["constructor"]+[] === 'function String() { [native code] }'
[]["constructor"]+[] === 'function Array() { [native code] }'
(![])["constructor"]+[] === 'function Boolean() { [native code] }'
[].find["constructor"] === 'function Function() { [native code] }'

// Letters gained: A,B,F,S,b,g,m

// How to find any number

(!![] << !![] << !![])+(+!![])+(+!![]) === 10

// How to find any lowercase letter

10["toString"](36) === 'a'
((!![] << !![] << !![] << !![]) + (+!![]) + (+!![]))["toString"](((+!![]+!![]) << (!![] << !![]) << (!![] << !![])) + (!![] << !![] << !![]))


// JSFucking the numbers
(!![]<<!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![])+!![] // 29
(!![]<<!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![]<<!![]) // 24
"function String()" => "function String()"[9] // I'll deal with this one later
(!![]<<!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![])+!![] // 29
(!![]<<!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![]<<!![])+(!![]<<!![])+!![] // 27
(!![]<<!![]<<!![]<<!![]<<!![])+!![]+!![] // 18
(!![]<<!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![])+!![]+!![]+!![] // 23
(!![]<<!![]<<!![]<<!![]<<!![]) // 16



[]+[] // ""
""["constructor"]+[] === 'function String() { [native code] }'

(([]+[])[([][([][[]]+[])[!![]<<!![]<<!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]+!![]]+([][[]]+[])[(!![]<<!![]<<!![]<<!![])]]+[])[(!![]<<!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![]<<!![])+!![]+!![]]+([][([][[]]+[])[!![]<<!![]<<!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]+!![]]+([][[]]+[])[(!![]<<!![]<<!![]<<!![])]]+[])[(!![]<<!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![]<<!![])+!![]+!![]+!![]]+([][[]]+[])[+!![]]+(![]+[])[+!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+(!![]+[])[+!![]+!![]]+([][([][[]]+[])[!![]<<!![]<<!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]+!![]]+([][[]]+[])[(!![]<<!![]<<!![]<<!![])]]+[])[(!![]<<!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![]<<!![])+!![]+!![]]+(!![]+[])[+![]]+([][([][[]]+[])[!![]<<!![]<<!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]+!![]]+([][[]]+[])[(!![]<<!![]<<!![]<<!![])]]+[])[(!![]<<!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![]<<!![])+!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[(!![]<<!![]<<!![]<<!![])+!![]] // s

(!![]<<!![]<<!![]<<!![])+!![] // 9



// toString = (!![]+[])[+![]]+([][([][[]]+[])[!![]<<!![]<<!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]+!![]]+([][[]]+[])[(!![]<<!![]<<!![]<<!![])]]+[])[(!![]<<!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![]<<!![])+!![]+!![]+!![]]+(([]+[])[([][([][[]]+[])[!![]<<!![]<<!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]+!![]]+([][[]]+[])[(!![]<<!![]<<!![]<<!![])]]+[])[(!![]<<!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![]<<!![])+!![]+!![]]+([][([][[]]+[])[!![]<<!![]<<!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]+!![]]+([][[]]+[])[(!![]<<!![]<<!![]<<!![])]]+[])[(!![]<<!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![]<<!![])+!![]+!![]+!![]]+([][[]]+[])[+!![]]+(![]+[])[+!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+(!![]+[])[+!![]+!![]]+([][([][[]]+[])[!![]<<!![]<<!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]+!![]]+([][[]]+[])[(!![]<<!![]<<!![]<<!![])]]+[])[(!![]<<!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![]<<!![])+!![]+!![]]+(!![]+[])[+![]]+([][([][[]]+[])[!![]<<!![]<<!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]+!![]]+([][[]]+[])[(!![]<<!![]<<!![]<<!![])]]+[])[(!![]<<!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![]<<!![])+!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[(!![]<<!![]<<!![]<<!![])+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]]+([][[]]+[])[+!![]]+(([]+[])[([][([][[]]+[])[!![]<<!![]<<!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]+!![]]+([][[]]+[])[(!![]<<!![]<<!![]<<!![])]]+[])[(!![]<<!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![]<<!![])+!![]+!![]]+([][([][[]]+[])[!![]<<!![]<<!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]+!![]]+([][[]]+[])[(!![]<<!![]<<!![]<<!![])]]+[])[(!![]<<!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![]<<!![])+!![]+!![]+!![]]+([][[]]+[])[+!![]]+(![]+[])[+!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+(!![]+[])[+!![]+!![]]+([][([][[]]+[])[!![]<<!![]<<!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]+!![]]+([][[]]+[])[(!![]<<!![]<<!![]<<!![])]]+[])[(!![]<<!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![]<<!![])+!![]+!![]]+(!![]+[])[+![]]+([][([][[]]+[])[!![]<<!![]<<!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]]+([][[]]+[])[(!![]<<!![]<<!![])+!![]+!![]]+([][[]]+[])[(!![]<<!![]<<!![]<<!![])]]+[])[(!![]<<!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![]<<!![])+!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[(!![]<<!![]<<!![]<<!![])+(!![]<<!![]<<!![])+!![]+!![]]