Rasi posted

!! (not not) operator in JavaScript?

what is !! (not not) operator in JavaScript? how it useful in JavaScript coding and how to use it ?

i did not heard !! operator but heard about ! - not operator . - noob

Jan 7 '17 03:21

! operator invert Boolean property , it make true to false and false to true so


!false=true
!true=false

and !! ( not not ) its nothing like two time ! operator . so if !!false return false and !!true return true.
so !! means invert two time.


!!false=false
!!true=true

hope it clear

!! not not is two time ! not operator nothing else . no more mis conception please

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