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Re^3: A more concise way to map the contents of an array.

by LanX (Canon)
on Dec 30, 2012 at 13:55 UTC ( #1010921=note: print w/ replies, xml ) Need Help??

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           A scalar value is interpreted as TRUE in the Boolean sense if i
    +t is not
           the null string or the number 0 (or its string equivalent, "0")
    +.  The
           Boolean context is just a special kind of scalar context where 
    +no
           conversion to a string or a number is ever performed.
    
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    Truth and Falsehood
     
    ...
           Negation of a true value by "!" or "not" returns a special fals
    +e value.
           When evaluated as a string it is treated as '', but as a number
    +, it is
           treated as 0.
    

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