cvs diff -u -d perlfaq4.pod
Index: perlfaq4.pod
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RCS file: /home/perlcvs/perlfaq/perlfaq4.pod,v
retrieving revision 1.8
diff -u -d -r1.8 perlfaq4.pod
--- perlfaq4.pod 2001/11/09 08:06:04 1.8
+++ perlfaq4.pod 2001/12/06 20:25:32
@@ -1635,13 +1635,13 @@
=head2 How can I know how many entries are in a hash?
If you mean how many keys, then all you have to do is
-take the scalar sense of the keys() function:
+use the keys() function in a scalar context:
- $num_keys = scalar keys %hash;
+ $num_keys = keys %hash;
-The keys() function also resets the iterator, which in void context is
-faster for tied hashes than would be iterating through the whole
-hash, one key-value pair at a time.
+The keys() function also resets the iterator, which means that you may
+see strange results if you use this between uses of other hash operators
+such as each().
=head2 How do I sort a hash (optionally by value instead of key)?
--
brian d foy <[EMAIL PROTECTED]> - Perl services for hire
CGI Meta FAQ - http://www.perl.org/CGI_MetaFAQ.html
Troubleshooting CGI scripts - http://www.perl.org/troubleshooting_CGI.html
