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What does ! mean?


李立峰
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! on its own by default with boolean variable like if(!something) would check if value is NOT true (I.E false), adding second if(!!something) would reverse previous comparison to check value IS true, so as you add more exclamation marks it would give opposite comparison to previous, NOT true, IS true, NOT true and so on....

 

Where

if(!something) //not true

 

or

 

if(something) // is true

 

would suffice

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