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My question is about boolean validation of below expression.

If you run (!+[]+[]+![]) in your JS console, it returns us 'truefalse'. How is it possible? How does this logic work?

Eddie
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Avinash Sivaraman
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1 Answers1

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First part !+[] returns true as a Boolean. Second part []+![] is "false" as String. Concatenating Boolean with String converts the result to string and gives you at the end "truefalse".

Here is provided deep explanation to JSFuck https://github.com/aemkei/jsfuck#how-it-works

Firanolfind
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