From: Mathieu Bouchard <matju@...>
Date: 2001-02-20T10:50:35+09:00
Subject: [ruby-talk:11142] Re: RCR's

On Wed, 14 Feb 2001, Robert Feldt wrote:
> class Proc
>   def *(other)
>     raise unless arity == other.arity
>     proc {|*a| self.call(other.call(*a))}
>   end
> end

wouldn't that be "raise unless arity == 1" ?

>  # BTW, this sure might be useful so you can consider this a RCR ;-)
>  # and why not throw in some syntactic sugar for the "lambda{|x| ...}"
>  # stuff � la Haskells "\x -> 2*x" while we're at it!

I may have preferred {} to always represent a Proc, like in Self and Brain
languages. Writing Hash[] instead of {} would be ok to me. However, this
would not be a minor change given that {} as a Proc special parameter
would also conflict with {} as a normal Proc value: 

foo {|x| 42} #=> normal ruby:   foo(&proc{|x| 42})
foo {|x| 42} #=> this proposal: foo( proc{|x| 42})

however, %p{|x| 42} as a shorthand for proc{|x| 42} would be nice if it
wasn't only 2 characters shorter.


matju