From: William James <w_a_x_man@...>
Date: 2005-10-21T09:51:59+09:00
Subject: Re: Functional with Ruby


Andreas Semt wrote:
> Hello list,
>
> here a really simple Haskell function, which sums all elements of a list
> (from the book "The Haskell School of Expression"):
> --------------------------------
> listSum [] = 0
> listSum (x : xs) = x + listSum xs
> --------------------------------
>
> Which is the best way to say it in Ruby (functional style)? Don't use
> 'enum.inject', please!
>
>
> Thanks for your thoughts.
> Greetings,
> Andreas Semt

irb(main):011:0> def sum(a,i)
irb(main):012:1>   i<a.size ? a[i] + sum(a,i.succ) : 0
irb(main):013:1> end
=> nil
irb(main):014:0> sum([1,3,5,7,9], 0)
=> 25