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

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

• warnings
• perllexwarn