Thursday, February 28, 2019

JavaScript Expression




Can anyone help me with this JavaScript expression?




+[[+!![]]+[+![]]+[+!![]]+[-~!![]+-~!![]-~!![]]+[-~!![]]+[+![]]+[+!![]]+[-~!![]+-~!![]]]


A friend sent it to me and asked me to copy and paste it in the browser console.



This is the result:



10162014




If anyone could explain this to me or at least point me to right references please. Thanks!


Answer



First break out your code to this: !![] which returns true (!! is to convert to boolean) and now + converts to number so +!![] returns 1.



![] converts to false so +![] returns 0.



~[] returns -1 and ~![] also returns -1.



~!![] returns -2.




Now, -~!![] returns 2 and -~![] returns 1.



So, combining them all returns 10162014.



All about you to know is ~, !, +, & -


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