Bye, fail, "10". Something about it: http://tmik.co.uk/?p=672. Also +!+[] works as that: (1) +[] converts falsy epmty array to number (+ operator) and it's 0, then (2) the bang makes it true (!0 === true), and finally (3) true is converted to number (+true), so the outcome is 1. List of characters that can be used with this strangeness: http://s…

10.js

++[[]][+[]]+[+[]]

bye.js

([]+{})[+!+[]+!+[]]+(+(+!+[]+([]+[][+[]])[+!+[]+!+[]+!+[]]+(+!+[])+(+[])+(+[])+(+[]))+[])[7]+([]+[][+[]])[+!+[]+!+[]+!+[]]

fail.js

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

hello-world.js

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