Re: [Mojolicious] Understanding shift->

2018-11-24 Thread john 



On 11/24/18 2:51 PM, Dan Book wrote:
The shift function removes and returns the first argument from @_ 
(since there's no array passed for it to shift from) in a sub. It's 
used this way because the first argument to these subs is the 
invocant/object. You can replace it with $_[0] to get the first 
argument without removing it. You should not use $self from outside 
unless necessary because that may create a circular reference and leak 
memory.

Thanks.  I totally missed that it was being used in a sub in those cases.

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Re: [Mojolicious] Understanding shift->

2018-11-24 Thread Dan Book 
The shift function removes and returns the first argument from @_ (since
there's no array passed for it to shift from) in a sub. It's used this way
because the first argument to these subs is the invocant/object. You can
replace it with $_[0] to get the first argument without removing it. You
should not use $self from outside unless necessary because that may create
a circular reference and leak memory.

-Dan

On Sat, Nov 24, 2018 at 3:40 PM john  wrote:

> This probably a perl question so if I should ask elsewhere let me know...
>
> In looking at the Mojo::Pg blog example and in recent addition of db
> method to Mojo::Pg::PubSub I see use of shift->.
>
>
>  From Mojo::Pg::PubSub documentation:
>
> # Reconnect immediately
> $pubsub->unsubscribe('disconnect')->on(disconnect => sub { shift->db });
>
> Or from the blog example:
>
> $self->helper(pg => sub { state $pg = Mojo::Pg->new(shift->config('pg'))
> });
>
> This doesn't work in my code and I replace "shift" with "$self".   That
> appears to be working.   Also, I can't reconcile using shift in this way
> and what the perl documentation says about it but could get over this if
> it worked.
>
> What am I missing here?
>
> Thanks,
>
> John
>
>
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[Mojolicious] Understanding shift->

2018-11-24 Thread john 

This probably a perl question so if I should ask elsewhere let me know...

In looking at the Mojo::Pg blog example and in recent addition of db 
method to Mojo::Pg::PubSub I see use of shift->.



From Mojo::Pg::PubSub documentation:

# Reconnect immediately
$pubsub->unsubscribe('disconnect')->on(disconnect => sub { shift->db });

Or from the blog example:

$self->helper(pg => sub { state $pg = Mojo::Pg->new(shift->config('pg')) });

This doesn't work in my code and I replace "shift" with "$self".   That 
appears to be working.   Also, I can't reconcile using shift in this way 
and what the perl documentation says about it but could get over this if 
it worked.


What am I missing here?

Thanks,

John


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