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Re: uninitialized value

by count0 (Friar)
on Jan 22, 2002 at 23:49 UTC ( #140717=note: print w/replies, xml ) Need Help??

in reply to uninitialized value

As a preventative measure, this is a good rule of thumb to follow:
Whenever you aren't sure if a variable has been assigned a value, give it one explicitly =)

The || operator is very useful here.
my $variable = $some_unknown_input || 'default'; my $foo = (defined $input ? $input : '');
In the first example, if $some_unknown_input is not a true value, $variable will be assigned 'default'.
In the second example, if $input is undefined (note this is not necessarily the same as being non-true, as in the first example), it is assigned an empty string.

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Node Type: note [id://140717]
[GotToBTru]: ugh. Thanks Corion
[shmem]: meh. setting up a SIG{__DIE__} before loading Net::SSLeay still triggers Can't locate object method "tid" via package "threads" at /usr/share/perl/5. 20/
[choroba]: setting in a BEGIN block?
[shmem]: choroba, yes

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