From: Jean-Hugues ROBERT <jean_hugues_robert@...>
Date: 2002-04-26T22:56:56+09:00
Subject: Re: $_ if no |var|

At 22:59 25/04/2002 +0900, Lars Christensen wrote:
>   [7,3,1,7,8,2,3,2].sort { |a,b| a <=> b }.map { |a| a**2 }
>This is more readable IMO:
>   [7,3,1,7,8,2,3,2].sort { a <=> b }.map { a**2 }
>I like this implicit stuff at work here, but I would perhaps create too
>much conflict with other variables? How about allowing the |n| to be put
>anywhere in the block?:
>   [7,3,1,7,8,2,3,2].sort { |a| <=> |b| }.map { |a|**2 }
>--
>Lars Christensen, larsch@cs.auc.dk

Very nice indeed. When is binding resolved, compile or run time ?
p = proc { if |a| then |c| else |b| end }
Ex:
   A) p.call( 1, 2, 3)   => 2
   B) p.call( nil, 2, 3) => 2 or 3 ?
I would prefer 3. This implies that binding of params to variables is done 
at compile time. On the contrary, if |x| semantic is to "consume" the 
"next" parameter (at runtime) then b would be assigned 2 and that is weird.

BTW: Handling the |p,| construction that I discovered today (thanks Matz) 
is adding another challenge.

Jean-Hugues

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