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Passing Parameters - Cont'd

• Inside functions, shift operates by default on the @_ array.
• Note that the @_ array is an alias, not a copy, of the input parameters.
• That's why it's a good idea to create a copy of the input parameters and work on them, to avoid unintended side-effects:

  sub func1 {
     my @params = @_; # create a copy of the input parameters
  }
  sub func2 {
     my $param1 = $_[0]; # an example of copying the input 
     my $param2 = $_[1]; #   parameters one by one.
  }
  sub func3 {
     my $param1 = shift; # shift works by default on @_
     my $param2 = shift; # 
  }
  

Offer Kaye. YAPC::Israel::2005.
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