If you know that you specifically want to use uninitialised variables, turn that warning off. It’s meant to help, not hinder you.

no warnings qw(uninitialized);

In this case, your two code snippets produce different results (the hyphen-minus is omitted in the second) so I wouldn’t suggest this technique. Be aware it’s there if you need it though.

Example

Before 5.6 this was only possible using $^W which turned off all warnings. Be very careful if you do that.

use warnings;

# This will generate a warning.
print undef;
{
  no warnings qw(uninitialized);
  
  # This won't.
  print undef;
}

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See Also

In reply to Re: concatenating partially uninitialized values by Arguile
in thread concatenating partially uninitialized values by tos

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