From: Guoliang Cao <caogl@...>
Date: 2008-04-27T13:16:25+09:00
Subject: Re: PartialInvocation sample

Trans wrote:
> 
> Hi,
> 
> #_ is sort off limits because IRB uses it. However, #__ is usable, and
> that is what Facets' library uses.

I'm not familiar with how _ is used in IRB. Can you please explain a bit 
more?

> 
> While the notation is nice, I'm not sure is necessary. If #curry is
> extended to take slot-order as arguments, then curry itself can be
> used. Eg.
> 
>   aproc = Proc.new{ |a,b| a ** b }
> 
>   aproc.curry     => lambda{ |a| lambda{ |b| a ** b }}
> 
>   aproc.curry(1)  => lambda{ |b| lambda{ |a| a ** b }}
> 
> More complex...
> 
>   aproc = Proc.new{ |a,b,c,d| ...}
> 
>   aproc.curry(3,1,0)  => lambda{ |d| lambda{ |b| lambda{ |a| lambda{ |
> c|...
> 
> Note, that last slot (2) is implied and need not be specified in the
> arguments.
> 
> T.

I agree curry can be made more generic. It'll be even better if we can 
have partial invocation on method calls. I think most of the time procs 
are local to a method and we can substitute known values into proc body 
without currying. However partial method invocation can be very useful 
to reduce entering same literal values.
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