Obfuscated javascript code with binary values?

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面向向阳花 2021-01-02 02:02

This code outputs D. The question is HOW?

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


      
      
        
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                   不知归路
                                             
                
                
                (楼主)
            
              
              
                2021-01-02 02:34
              

            
            
                        
![] is false. ![] + [] evaluates to 'false'. +[] is 0 so !+[] is true, etc. javascript is very strange with its implied type conversions
    
             
                                                        
            
            
              
                
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