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Home: Fun With Perl: Perl Quizzes - Learn Perl the Fun Way: undef(); and delete();

sleuth Enthusiast Dec 12, 2000, 1:45 PM Post #1 of 3 (16449 views) undef(); and delete(); Can't Post $hash{'key'} = "value"; What is the difference between undef($hash{'key'}); and delete($hash{'key']); ? Sleuth

perlplexer Deleted Dec 13, 2000, 6:13 AM Post #2 of 3 (16437 views) Re: undef(); and delete(); [In reply to] Can't Post 1) delete($hash{'key'}); - deletes both the key and the value from %hash returning the deleted value. exists($hash{'key'}) returns false 2) undef($hash{'key'}); - simply undefs the value that is associated with 'key' exists($hash{'key'}) returns true

sleuth Enthusiast Dec 13, 2000, 12:06 PM Post #3 of 3 (16428 views) Re: undef(); and delete(); [In reply to] Can't Post   Perfect Score!!!! You hit it right in the mark, that's exactly what I was getting at. If you undef the hash key, exists($hash{'key'}); returns true. Great job perlplexer, Sleuth

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