From: Trans <transfire@...>
Date: 2005-09-26T13:41:42+09:00
Subject: How each class splats

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

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).

  class A
    def initialize(i,v)
      @i,@v=i,v
    end
    def splat( arity )
      case arity
      when 1 then self
      when 2 then [@i,@v]
      else
        [@i,@v].concat( [nil]*(arity-2) )
      end
    end
  end

Or something to that effect.

Thanks,
T.