From: Logan Capaldo <logancapaldo@...>
Date: 2006-08-31T02:43:29+09:00
Subject: Re: [RCR] Array.step


On Aug 30, 2006, at 1:12 PM, ara.t.howard@noaa.gov wrote:

>
>
>
> harp:~ > cat a.rb
> class Array
>   def self.step i, *a, &b
>     j, s, ignored = *a
>     i, j = 0, i if j.nil?
>     s ||= (j < i ? -1 : 1)
>     list = new
>     i.step(j,s){|k| list << k}
>     list.map! &b if b
>     list
>   end
> end
>

require 'enumerator'
class Array
   def self.step(i, *a, &block)
     b = block || lambda { |x| x }
     i.to_enum(:step, *a).map(&b)
   end
end