From: Gavin Kistner <gavin.kistner@...>
Date: 2006-09-09T01:34:22+09:00
Subject: Re: symbol tricks

From: Jason Nordwick [mailto:jason@adapt.com] 
> Plus for arrays and strings is concatenation. I don't like it 
> either, b/c array plus should be addition of corresponding 
> elements, but that is the way things are.

That's seems oddly specific to me, but if you don't like it, change it:

a = [ 1, 2, 3 ]
b = [ 4, 5, 6 ]
p a+b
#=> [1, 2, 3, 4, 5, 6]

class Array
  def +( other )
    self.zip( other ).map{ |e| e[0]+e[1] }
  end
end

p a+b
#=> [5, 7, 9]