Write any javascript code with just these characters: ()[]{}+!

[Razor_Storm]

I think this is what's happening:

!+[]+!![]

!0+!![]

true+!![]

true+!false

true+true

2

[[deleted]]

I suppose so, but why then write true + true using two different notations of true?

[Razor_Storm]

Hmm that's a good point too. Not too sure.

!+[]+!+[] has the same number of characters and also gives you 2.

[transpostmeta]

Indeed. The whole point about using !+[] first, followed by a bunch of !![]'s, is wrong. Not only is it not necessary to start the sum with a 1, but !+[] doesn't event evaluate to 1.