From: Daniel Martin <martin@...>
Date: 2007-04-30T21:09:02+09:00
Subject: Re: Array.which_long? ( I coded an extension for Array )

"Robert Dober" <robert.dober@gmail.com> writes:

> But it was to return an array of all longest elements, I guess you can
> maybe refine it, it seems clumsy, so I repost it just if you have some
> time to play ;)
>
> def longest
>          inject([]){ |s, e|
>                 if s.empty? || s.first.size < e.to_s.size then [e]
>                 elsif s.first.size == e.to_s.size then s << e
>                 else s
>                 end
>               }
> end


That does seem clumsy.  How about:

class Array
  def longest
    inject([0,[]]) { |(s,l),e|
      if e.to_s.size == s then [s,l << e]
      elsif e.to_s.size < s then [s,l]
      else [e.to_s.size, [e]]
      end
    }[1]
  end
end

Gotta love those destructuring block parameters.

-- 
s=%q(  Daniel Martin -- martin@snowplow.org
       puts "s=%q(#{s})",s.to_a[1]       )
       puts "s=%q(#{s})",s.to_a[1]