function is defined as
sub Modify_Debug {$Debug=shift;}
. Is there any syntax sugar?
function is defined as
sub Modify_Debug {$Debug=shift;}
. Is there any syntax sugar?
shift function removes the first element from the array and returns it. The array is shortened by one element missing.
the default array in a function (if not given as an argument) is @ _ , or @ ARGV in the file scope.
therefore, $Debug=shift; is set to the first function argument.
shift () is a built-in Perl subroutine that takes an array as an argument, then returns and deletes the first item in the array. The common practice is to get all the parameters passed to the subroutine through the shift call. For example, suppose you have a foo subroutine with three parameters. One way to assign these parameters to local variables is in shift:
sub foo {
my $x = shift;
my $y = shift;
my $z = shift;
-sharp do something
print($x,$y, $z);
}
foo(1,2, 3 );
-sharp123
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