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@NostraDavid

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@NostraDavid NostraDavid commented Jan 31, 2020

As someone who likes to run code of which he does not know what it does: I can confirm it outputs "Hello, World!"
I also formatted it in vscode and it turned into 1239 lines of JS insanity.
What the code does is this:

  1. Use the weird JS casting system to generate the "true", "false" and "undefined" strings.
  2. Use [] as an array accessor to pick a letter.
  3. Concatenate those letters to form words.
    Repeat 2 and 3 a whole bunch of times until you reach "Hello, World!"

Here is how the first part of the visible code works:
(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]

Lets format it first:

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

That's a LOT more readable! A lot of ()[] + ...

code result note
[] []
![] false
![] + [] "false"
+[] 0
(![] + [])[+[]] "f" first letter
[![]] + [][[]] "falseundefined"
+!+[] + [+[]] "10" concatenates "1" and "0"
[![]] + [][[]])[+!+[] + [+[]]] "i" second letter
!+[] true
!+[] + !+[] 2 true + true = 2
(![] + [])[!+[] + !+[]] "l" third letter
!![] true another form of true
(!![] + [])[+[]] "t" fourth letter
!+[] + !+[] + !+[] 3
(!![] + [])[!+[] + !+[] + !+[]] "e" fifth letter
+!+[] 1
(!![] + [])[+!+[]] "r" sixth and last letter

This gives us our word: "filter"

That's the base functionality of this weird abrakadabra

@shakna-israel

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@shakna-israel shakna-israel commented Jan 31, 2020

@NostraDavid

JS is incredibly leaky, letting you do crap like this.

JSFuck is an engine that automatically spits out this for you.

I think I made this gist when someone was trying to argue that JS doesn't leak any of its implementation details (like everything internally being a string).

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