From: Eric Mahurin <eric_mahurin@...>
Date: 2005-05-16T04:48:09+09:00
Subject: Re: RCR 307: allow attributes to take arguments for assignment


--- ES <ruby-ml@magical-cat.org> wrote:
> 
> Le 15/5/2005, "Eric Mahurin" <eric_mahurin@yahoo.com> a
> �crit:
> >I just put in a RCR that allows for a little more syntax
> sugar.
> > The proposal is just to make:
> >
> >  object.attribute(arguments) = expression
> >
> >to be equivalent to:
> >
> >  object.send(:attribute=,arguments,expression)
> >
> >This would just be a nice-to-have RCR in my opinion as you
> can
> >use standard methods instead.  But, it does seem like
> Rubyish
> >syntax.  Here is the link if you are interested:
> >
> >http://www.rcrchive.net/rcr/show/307
> 
> Call me stupid, but I am afraid I do not understand what this
> code would *do*. Could you clarify, maybe post an example (if
> possible, with Ruby code)?
> 
> E

I put 3 examples (just added one more) in the RCR.  Here is one
of them elaborated a little more.  This extends the "values_at"
"attribute" in Array and Hash that retrieves values from a list
of indices/keys to also set those values:

class Array # or Hash
def values_at=(*args)
    rhs = args.pop
    args.zip(rhs).each { |assign|
        self[assign[0]] = assign[1]
    }
    self
end
end

# current usage
array_or_hash.send(:values_at=,*indices,values_array)

# proposed usage
array_or_hash.values_at(*indices) = values_array

a=(0..15).to_a
a.send(:values_at=,3,9,11..15,["three","nine","11..15"])
a  # [0, 1, 2, "three", 4, 5, 6, 7, 8, "nine", 10, "11..15"]



		
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