defined
Can a value be uninitialized, but still defined, in Perl?
Running ActiveState Perl 5.10.1 on win32. How is it that this code: die(defined($r->unparsed_uri =~ \'/(logout.pl)?$\'));[详细]
2022-12-19 12:40 分类：问答How can I determine if a Perl hash contains a key mapping to an undefined value?
I need to determine if a Perl hash has a given key, but that key will be mapped to an undef value.Specifically, the motivation for this is seeing if boolean flags while using getopt() with a hash refe[详细]
2022-12-17 18:04 分类：问答Hibernate entity with user defined attributes
Can someone please give me some tips on modeling hibernate entities that have some known attributes while the majority are defined by the user of the system (during initial setup of the开发者_如何学Go[详细]
2022-12-10 17:05 分类：问答Determine if variable is defined in Python [duplicate]
This question already has answers here: Easy way to check that a variable is defined in python? [duplicate][详细]
2022-12-09 12:19 分类：问答
![Interactive visualization of a graph in python [closed]](https://www.devze.com/res/2023/04-10/09/92d32fe8c0d22fb96bd6f6e8b7d1f457.gif)
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