Date: August 26, 2008 11:23
p4raw-id: //depot/perl@34239
Given an expression that specifies a hash element or array element,
returns true if the specified element in the hash or array has ever
-been initialized, even if the corresponding value is undefined. The
-element is not autovivified if it doesn't exist.
+been initialized, even if the corresponding value is undefined.
print "Exists\n" if exists $hash{$key};
print "Defined\n" if defined $hash{$key};