WTF Javascript - Tumblr Ignite #3

Did you know you can implement a fully functional Javascript app using just 8 distinct characters?

Transcript

1. So... Uhhh... WTF Javascript? Things you may not have known about Javascript
2. Little test for the audience What do you get when you execute this? [] + []
3. Ok, if you got an empty string from that, what do you think you get from this? [] + {}
4. Since that gave us such a useful result, what do you think this does? {} + []
5. Clearly we are in the land of consistency already, so what about this? {} + {}
6. And finally, what do you think this does? ![] + []
7. Ok, so why does this matter?
8. (![]+[])[+!+[]] A
9. ({}+[])[+!+[]+!+[]] B
10. (([+! + []] / []) + []) [+! + [] +! +[] +! + []] I
11. a, b, c, d, e, f, g, i, j, l, n, o, r, s, t, u, v, y, O, N, S Ok, so with these letters, what can we actually do with them?
12. ("constructor") [("constructor")] [("constructor")] (“alert(1)”) ()
13. btoa ({}+[])[+!+[]+!+[]] + (!![]+[])[+[]] + ({}+[])[+!+[]] + (![]+[])[+!+[]]
14. (({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+ [][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+! +[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+ []+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![] +[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]])[(({}+[])[+!+[]+! +[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+ []+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[]) [+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+! +[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+ [])[+!+[]]+(!![]+[])[+!+[]])][(({}+[])[+!+[]+!+[]+!+[]+!+[] +!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+ []+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[]) [+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+! +[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!! []+[])[+!+[]])]((!![]+[])[+!+[]] + (!![]+[])[+!+[]+!+[]+!+ []] + (!![]+[])[+[]] + (([][[]])+[])[+[]] + (!![]+[])[+!+ []] + (([][[]])+[])[+!+[]] + ({}+[])[+!+[]+!+[]+!+[]+!+[]+! +[]+!+[]+!+[]] + ({}+[])[+!+[]+!+[]] + (!![]+[])[+[]] + ({} +[])[+!+[]] + (![]+[])[+!+[]])()
15. (({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+ []]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[] +!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]])[(({}+ [])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(! []+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]] +({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]])][(({}+[])[+! +[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[]) [!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+ [])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]])]((!![]+[])[+!+[]] + (!![]+[])[+!+[]+!+[]+!+[]] + (!![]+[])[+[]] + (([][[]])+[])[+[]] + (!![]+[])[+!+[]] + (([] [[]])+[])[+!+[]] + ({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]] + ({}+[])[+!+[]+!+[]] + (!![]+ [])[+[]] + ({}+[])[+!+[]] + (![]+[])[+!+[]])()( (([][[]])+[])[+!+[]+!+[]+!+[]+!+[]] + (({}+[]) [+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+ [])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+ ({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]][({}+[])[+!+[] +!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+ []+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[]) [+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]]])[(+!+[]+!+[]+!+[]+! +[]+!+[]+!+[])*(+!+[]+!+[]+!+[]+!+[])] + (([+!+[]]/[])+[])[+!+[]+!+[]+!+[]] + ([]+{})[+[]]) btoa(“fgi[“) = "ZmdpWw==“
16. a, b, c, d, e, f, g, i, j, l, n, o, r, s, t, u, v, y, O, N, S, Z, m, p, W, w, P, Q
17. return Object.getOwnPropertyNames( String ) (!![]+[])[+!+[]] + (!![]+[])[+!+[]+!+[]+!+[]] + (!![]+[])[+[]] + (([][[]])+[])[+[]] + (!![]+[])[+!+[]] + (([][[]])+[])[+!+[]] + ({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]] + ({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]] + ({}+[])[+!+[]+!+[]] + ({}+[])[+!+[]+!+[]+!+[]] + (!![]+[])[+!+[]+!+[]+!+[]] + ({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]] + (!![]+[])[+[]] + (({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]] +({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]])[(({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]] +({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]])][(({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]] +({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]])]((!![]+[])[+!+[]] + (!![]+[])[+!+[]+!+[]+!+[]] + (!![]+[])[+[]] + (([][[]])+[])[+[]] + (!![]+[])[+!+[]] + (([][[]])+[])[+!+[]] + ({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]] + (![]+[])[+!+[]] + (!![]+[])[+[]] + ({}+[])[+!+[]] + ({}+[])[+!+[]+!+[]])()( (!![]+[])[+!+[]+!+[]+!+[]] + (([+!+[]]/[])+[])[+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]] + [!+[]+!![]+!![]+!![]]+[])[ +!+[] ] + (({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+ []]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]][({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]] +(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]]])[(+!+[]+!+[]+!+[]+!+[]+!+[]+!+[])*(+!+[]+!+[]+!+[]+!+[])] + (!![]+[])[+!+[]+!+[]+!+[]] + (!![]+ [])[+[]] + ({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]] + (({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+ []+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]])[(({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+ []+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]])][(({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+ []+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]])]((!![]+[])[+!+[]] + (!![]+[])[+!+[]+!+[]+!+[]] + (!![]+[])[+[]] + (([][[]])+[])[+[]] + (!![]+[])[+!+[]] + (([][[]])+[])[+!+[]] + ({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]] + ({}+[])[+!+[]+!+[]] + (!![]+[])[+[]] + ({}+[])[+!+[]] + (![]+[])[+!+[]])()( (([][[]])+[])[+!+[]+!+[]+!+[]+!+[]] + (({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[]) [+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]][({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[]) [+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]]])[(+!+[]+!+[]+!+[]+!+[]+!+[]+!+[])*(+!+[]+!+[]+!+[]+!+[])] + (([+!+[]]/[])+[])[+!+[]+!+[]+!+[]] + ([]+{})[+[]])[+!+[]+!+[]+!+[]+!+[]+!+[]] + (([][[]])+[])[+!+[]] + (({}+[])[+!+[]+!+[]+!+[]+!+[]+!+ []]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]])[(({}+[])[+!+[]+!+[]+!+[]+!+[]+!+ []]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]])][(({}+[])[+!+[]+!+[]+!+[]+!+[]+!+ []]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]])]((!![]+[])[+!+[]] + (!![]+[])[+!+[] +!+[]+!+[]] + (!![]+[])[+[]] + (([][[]])+[])[+[]] + (!![]+[])[+!+[]] + (([][[]])+[])[+!+[]] + ({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]] + ({}+[])[+!+[]+!+[]] + (!![]+[])[+[]] + ({}+[])[+!+[]] + (![]+[])[+!+[]])()((({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[] [[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]])[(({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[] [[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]])][(({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[] [[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]])]((!![]+[])[+!+[]] + (!![]+[])[+!+[]+!+[]+!+[]] + (!![]+[])[+[]] + (([][[]])+[])[+[]] + (!![]+[])[+!+[]] + (([][[]])+[])[+!+[]] + ({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]] + ({}+[])[+!+[]+!+[]] + (!![]+[])[+[]] + ({}+[])[+!+[]] + (![]+[])[+!+[]])()( (([][[]])+[])[+!+[]+!+[]+!+[]+!+[]] + (({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]] +([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]][({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+ ([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]]])[(+!+[]+!+[]+!+[]+!+[]+!+[]+!+[])*(+!+[]+!+[]+!+[] +!+[])] + (([+!+[]]/[])+[])[+!+[]+!+[]+!+[]] + ([]+{})[+[]])[+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]])[+[]] + (!![]+[])[+!+[]] + ({}+[])[+!+[]] + 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+[]] + (!![]+[])[+[]] + ({}+[])[+!+[]] + (![]+[])[+!+[]])()( (([][[]])+[])[+!+[]+!+[]+!+[]+!+[]] + (({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+! +[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]][({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+ []]+({}+[])[+!+[]]+(!![]+[])[+!+[]]])[(+!+[]+!+[]+!+[]+!+[]+!+[]+!+[])*(+!+[]+!+[]+!+[]+!+[])] + (([+!+[]]/[])+[])[+!+[]+!+[]+!+[]] + ([]+{})[+[]])[+!+[]] + (!![]+[])[+!+[]+!+[]+!+[]] + (![]+[])[+!+[]+!+[]+!+[]] + (({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[] +!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]][({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+ (!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]]])[(+!+[]+!+[]+!+[]+!+[]+!+[])*(+!+[]+!+[]+!+[]+!+[]+!+[])] + (([]+[])[(({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+! +[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]])]+[])[(+!+[]+!+[]+!+[])*(+!+[]+!+[]+!+[])] + (!![]+[])[+[]] + (!![]+[])[+!+[]] + (([+!+[]]/[])+[])[+!+[]+!+[]+!+ []] + (([][[]])+[])[+!+[]] + (({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]][({}+ [])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]]])[(+!+[]+!+[]+!+[]+!+[]+!+[]+!+ [])*(+!+[]+!+[]+!+[]+!+[])] + (({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]] [({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[!+[]+!+[]+!+[]+!+[]+!+[]]+({}+[])[+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+({}+[])[+!+[]]+(!![]+[])[+!+[]]])[(+!+[]+!+[]+!+[]+!+[]+!+ [])*(+!+[]+!+[]+!+[]+!+[]+!+[])+!+[]] ) () [+!+[]+!+[]+!+[]+!+[]+!+[]])() String.fromCharCode() as a callable function
19. So who would have thought you could do so much with just: [ ] ( ) { } + !
20. Now you know too!