[Omaha.pm] Proper way to test a variable with strict and -w?
Daniel Linder
dan at linder.org
Fri Sep 2 09:37:12 PDT 2005
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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 “// “ 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
- - - - -
"Wait for that wisest of all counselors, time." -- Pericles
"I do not fear computer, I fear the lack of them." -- Isaac
Asimov
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