From: Devin Mullins <twifkak@...>
Date: 2007-03-26T07:47:50+09:00
Subject: Re: Backus, Functional Programming, and Ruby

Jesse Merriman wrote:
> On Sunday 25 March 2007 18:03, Joel VanderWerf wrote:
> 
>>Ruby has its own way of doing things, not that there is anything wrong
>>with defining new ways:
>>
>>[[1,2,3], [6,5,4]].transpose.map{|x,y|x*y}.inject{|s,x|s+x}
>>=> 28
> 
> Yep, I was just seeing how close I could make Ruby code look like Backus' 
> code; the goal was to define inner_product as a compose of the three other 
> functions without any named variables.

module Enumerable
   def inner_product
     transpose.map(&:*).inject(&:+)
   end
end

:P

(Not to slight Backus. Functional programming and BNF are both totally 
cool.)