You'll be enrolled at LMU Munich â Germany's #1 ranked university, take language courses at JYM, and design your own program of study.
Undefined is defined. Define means to set the limits, explain. So, undefine means not to set limits or not to explain.
The dereferencing as a hash is done with the %{ } , and the undefined value is the empty array slice you took with @_[0] (although what you actually want when you retrieve a single element of an array is the $ sigil, like the warnings tell you).he @_ array is only useful inside of subroutines, where it contains the arguments that the subroutine is called with. For an intro to references in Perl, see perldoc perlreftut. For explanations on particular warnings, see perldoc perldiag, or put use diagnostics; in your script to enable verbose warnings.