What is lexical scoping in Perl?

What is lexical scoping in Perl?

Lexical scoping in Perl refers to the visibility of variables within a block of code, determined by where they are declared.

Can you give me an example of lexical scoping?

Sure! Here's a simple example:

my $x = 10;

sub example {
    my $y = 20;
    print $x;  # This will print 10
    print $y;  # This will print 20
}

example();
print $y;  # This will cause an error because $y is not visible here.

What happens if I try to access a variable outside its scope?

If you try to access a variable outside its lexical scope, Perl will throw an error indicating that the variable is not defined.

Are there any best practices for using lexical scoping?

Yes! It's best to declare variables as locally as possible, use meaningful names, and avoid global variables to maintain clean code.