|Perl: the Markov chain saw|
Re: Comparing a value to hash keyby NetWallah (Canon)
|on Nov 14, 2012 at 04:53 UTC||Need Help??|
Is it possible to check a variable against all the keys in a hashThe question suggests you do not understand the fundamental property of a hash.
The primary use of a hash is for a quick and simple lookup of a 'key', by indexing, using curly-braces.
The first line of your code:
does exactly that - looks up the value of $remoteIP, and can be thought of as comparing with every possible key in %hash, and returning 'true' if the matching one exists.
Your later comparison:
is a more expensive way of doing the same comparison that the first line does.
"By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest." -Confucius