Why does alert(++[[]][+[]]+[+[]]); print 10?

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Why does ++[[]][+[]]+[+[]] return the string “10”? 8 answers

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Check out jsfuck.com. This gives examples and shows how to, quite literally, write any code using it.

The basics:

false       =>  ![]
true        =>  !![]
undefined   =>  [][[]]
NaN         =>  +[![]]
0           =>  +[]
1           =>  +!+[]
2           =>  !+[]+!+[]
10          =>  [+!+[]]+[+[]]
Array       =>  []
Number      =>  +[]
String      =>  []+[]
Boolean     =>  ![]
Function    =>  []["filter"]
eval        =>  []["filter"]["constructor"]( CODE )()
window      =>  []["filter"]["constructor"]("return this")()

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