From: Mike Stok <mike@...>
Date: 2006-05-12T00:03:41+09:00
Subject: Re: each with arguments


On 11-May-06, at 10:53 AM, Charles Churchill wrote:

> I've found myself writing the following code to address needs I have
> processing formatted text files, but is this possible some other and I
> am going through foolish gyrations here...
>
> Here is the code:
>
>  class Array
>     alias :orig_each :each
>     def each(cnt = 1, &blk)
>       if cnt == 1
>          orig_each { |x| blk.call(x) }
>       else
>          0.step(self.size - 1,cnt) do |i|
>             yield(self.slice(i,cnt))
>          end
>       end
>    end
>  end
>
> so I can do things like this
>
> arr = [ key, value, value, key, value, value, key, value, value, ... ]
> arr.each(3) do |key,val1,val2|
>    #manipulate them as I see fit
> end
>
> Thanks for any help you can give!

Have you looked at Enumerable#each_slice which is included in Array?

ratdog:~ mike$ ri Enumerable#each_slice
-------------------------------------------------- Enumerable#each_slice
      e.each_slice(n) {...}
------------------------------------------------------------------------
      Iterates the given block for each slice of <n> elements.

      e.g.:

          (1..10).each_slice(3) {|a| p a}
          # outputs below
          [1, 2, 3]
          [4, 5, 6]
          [7, 8, 9]
          [10]

Mike

-- 

Mike Stok <mike@stok.ca>
http://www.stok.ca/~mike/

The "`Stok' disclaimers" apply.