hello.js

hello.js

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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

@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).