[Omaha.pm] Proper way to test a variable with strict and -w?

[Daniel Linder]

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On Thu, September 1, 2005 17:37, Kenneth Thompson wrote:

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>>Ah, this could be a good use of the
"//" instead of "||", right?


>Could be-
what does &ldquo;// &ldquo; do?






 

I believe someone mentioned that it is a "smarter" form of
"||" that is due to be included in a future release of
Perl.  In this example, if the value to the left of "//" is
a value, zero or empty string, then the value the "//" operator
returns will be the value/zero/empty string respectively.  If the
variable is not defined (or possibly "NaN" or other error
values), then it will return the value on the right side of the
"//" operator.



I haven't seen a writeup of this new functions planned implementation
rules so this might be way off.



Dan



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