From: Martin DeMello <martindemello@...>
Date: 2007-02-15T16:14:17+09:00
Subject: Re: Justification for Array#join behaviour?

On 2/15/07, Bertram Scharpf <lists@bertram-scharpf.de> wrote:
>
>   class Array
>     def deep_join sep
>       map { |x|
>         case x
>           when Array then x.deep_join sep
>           else            x.to_s
>         end
>       }.join sep
>     end
>   end
>
> I don't look at this as a smart programming style actually.
>
> The object-oriented approach is to redefine `to_s'.

Or

class Object
  def join
    to_s
  end
end

module Enumerable
  def join
    "[" + inject {|a, e| a.join + ", " + e.join} + "]"
  end
end

class Array
  def join
    super
  end
end

class String
  def join
    self
  end
end

puts [1, 2, 3, [4, 5, [6, 7], 8]].join

martin