From: Phrogz <gavin@...>
Date: 2006-11-28T13:45:14+09:00
Subject: Re: ruby and list comprehension

James Cunningham wrote:
> I found this while web searching for the same thing recently; I can't
> recall where I found it. It's a cute little hack.
>
> class Array
>   def comprehend
>     return self unless block_given?
>     result = []
>     self.each { |i| result.push yield(i) }
>     result.compact
>   end
> end

Maybe I don't comprehend comprehending, but why the result/each instead
of map?

class Array
  def comprehend
    if block_given?
      map{ |i| yield( i ) }.compact
    else
      self
    end
  end
end

or perhaps better

class Array
  def comprehend( &block )
    block ? map( &block ).compact : self
  end
end