Create a function that is only available inside the scope where it is defined ?

$pvt = Calculation(5,5);
 
print("Result = $pvt\n");
 
sub Calculation{
 
my ($fstVar, $secndVar) = @_;
 
my $square = sub{
 
return($_[0] ** 2);
 
};
 
return(&$square($fstVar) + &$square($scndVar));
 
};

Output: Result = 50