Is this calling a function: $actions{$page}->();

[bobbybobbertson]

I found this line in some code and don't understand it.
Is it calling a function using variables?

$actions{$page}->();

 

[justice41]

You are almost correct. It's calling a function using a reference to a subroutine. The value of the key contained in [tt]$page[/tt] is a reference to a subroutine. If you declared a hash like

my %actions = (  page1  => \&go_page1,
                 page2  => \&go_page2,
            );

And then set [tt]$page = 'page1'[/tt],
you line of code would call the [tt]go_page1()[/tt] function.

This is just like regular sub references:

$subref = \&mysub;
# Or 
$subref = sub { ... (sub def here) .. };
# Then call as
$subref->();

jaa

 

[bobbybobbertson]

very helpful, thanks