From: Ricardo Panaggio <panaggio.ricardo@...>
Date: 2010-07-22T10:43:20+09:00
Subject: Re: Enumerators and generators

Hello Hal

Generators "externalize" iteration, whereas Enumerator "internalize"
it (but this docs may have already told you).

Generators can be used to create a "controlled stream" of objects,
that you can operate as you where using a remove control: go to the
next (Generator#next), give me the position (Generator#pos), return to
the beginning (Generator#rewind), ...

Enumerator offers methods to iterate through the entire stream, like
iterate using a windows of size X (Enumerator#each_cons), iterate
using slices from the stream (Enumerator#each_slide), ...

They are quite different in use, although both are usable to iterate over data.

On Wed, Jul 21, 2010 at 22:12, Hal Fulton <rubyhacker@gmail.com> wrote:
> Hi, all...
>
> I'm trying to grasp when/why one might use a generator instead of
> an enumerator (or vice versa).
>
> I've used generators, but enumerators are newer to me.
>
> I've heard one person's take on this (thanks David!) but thought
> I might ask more thoughts...
>
> Thanks,
> Hal Fulton
>