From: "David A. Black" <dblack@...>
Date: 2005-09-26T23:11:08+09:00
Subject: Re: How each class splats

Hi --

On Mon, 26 Sep 2005, Trans wrote:

> First I'll just ask it there's a way to do this WITHOUT redefining
> #each in Array.
>
>  class A
>    def initialize(i,v)
>      @i,@v=i,v
>    end
>  end
>
>  arrayofA = [ A.new(:a,1), A.new(:b,2) ]
>
>  arrayofA.each { |e| p e }
>  => #<A @i=:a,@v=1>
>     #<A @i=:b,@v=2>
>
>  arrayofA.each { |i,v| p i,v }
>  => :a
>     1
>     :b
>     2

You could probably get a similar result by doing something with
A#inspect, though probably not exactly what you've got here.

> If thsi is not possible, what do people think of allowing a class to
> define a #splat method to determine how it will splat into an each
> block (and perhaps other things).

I'd want a better name, and more rationale.  My instinct is to prefer
to know how scalar and/or container objects will behave, and plan for
that, rather than have different objects do arbitrarily different
things in the face of argument assignment.


David

-- 
David A. Black
dblack@wobblini.net