From: Dominik Bathon <dbatml@...>
Date: 2006-01-04T05:59:26+09:00
Subject: Re: Implicit block parameter?

On Tue, 03 Jan 2006 19:39:48 +0100, <dblack@wobblini.net> wrote:

> Hi --
>
> On Wed, 4 Jan 2006, Ross Bamford wrote:
>
>> 	[[1,2,3],[2,3,4],[3,4,5]].each { it.select { it % 2 == 0 } }
>>
>> (I've not tested that btw but you get the idea). However I guess with  
>> that it's also potentially confusing when using the implicit idea,  
>> since it has the same magic variable meaning two different things in  
>> the same line. I guess in this case I'd probably declare the argument  
>> in the select block anyway (as 'i' or something).
>
> That's actually another good argument against "it": you'd be trampling
> the outer it with the inner it.  And having to remember to declare the
> inner argument to protect it from this really puts the whole thing in
> the "added to the language as an afterthought" category.

With the patch I sent the outer "it" is not "overwritten" by the inner  
"it", because it's a global function and not a variable and it always  
returns the first argument of the current block (if none was given it  
returns nil).

And for the other point: if it gets to complicated, just don't use "it"  
and declare the argument(s).

Dominik