From: Mark Hubbart <discordantus@...>
Date: 2004-11-22T13:06:06+09:00
Subject: Re: meaning of #slice

On Fri, 19 Nov 2004 22:20:12 +0900, trans.  (T. Onoma)
<transami@runbox.com> wrote:
> Are Enumerator#each_slice and #enum_slice properly named? All they take is an
> integer which groups the enumerator's elements:
> 
>   [1,2,3,4,5,6].to_enum.enum_slice(2).to_a
>   #=> [[1,2],[3,4],[5,6]]
> 
> Yet Array#slice does nothing of the sort:
> 
>   [1,2,3,4,5,6].slice(2)
>   #=> 3

Array#slice takes a starting index and the optional second arg tells
how many elements to take. in Enumerator#enum_slice, the starting
index is pointless, so I guess they just eliminated it; so all you
have left is the optional second arg, the size of the slice. Just a
guess.

> 
> Also, how does one achieve #enum_slice functionality without Enumerator using
> only Array?

tmp = array_to_work_with.dup
until tmp.empty?
  do_stuff_with( tmp.slice!(0, size) )
end

hth,
Mark