[Israel.pm] function prototypes

Shmuel Fomberg semuelf at 012.net.il
Wed Jun 11 09:05:18 PDT 2008

Hi All.

Shmuel Fomberg wrote:

> I'm trying to write a function:
> sub MetaField ($&) { ... }
> and call it like that:
> MetaField("data", { $_->ctx->{length} })
> or:
> MetaField("data", $_->ctx->{length})
> but only this works:
> MetaField("data", sub { $_->ctx->{length} })

I want to clarify that the call is suppose to do what the last statment 
does: when MetaField runs the sub, it will return the value inside 
$_->ctx->{length}. (and not that $_->ctx->{length} will contain the sub ref)

The propose of this is to make it niffy. I need to make some info 
available to the function, so I thought to load it on an object, local 
$_ to it, and run the function.

So why map/grep can work without sub{}, and I can't?


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