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• Commented on I hate unpacking sub calls with shift
  Newcomers need to understand that sub call arguments are passed in an array. And to appreciate the power of arrays, a programmer needs to understand how shift, unshift, pop, push etc are array operators. I agree that placing a shift...

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• Tom Molesworth commented on I hate unpacking sub calls with shift

  $! is common enough that it shouldn't need comments, though?

  If the argument is that people learning perl won't understand them, I'd disagree:

  open my $fh, '

  tends to be covered very early in most tutorials, and is also described in perldoc perlopentut. To some extent the same applies to $/, reading in paragraph mode or in fixed chunks is something that you encounter very early.…

• Olivier Mengué (dolmen) commented on I hate unpacking sub calls with shift

  Note also that @_ is alias to arguments given to the sub which means that it gives you not only read access to the argument, but also write access if it is a variable.

  my $a = 2;
  say $a;
  
  sub change_arg_0
  
  {
  
      $_[0] = 1;
  
  }
  
  change_arg_0($a);
  
  say $a;