[ruby-talk:01189] Re: Enumerable and index

In message "[ruby-talk:01188] Enumerable and index"
    on 00/01/27, Dave Thomas <[e-mail]> writes:

>Should there be a method Enumerable#index? It's documented in the 1.4
>html, and array and hash implement an override, but it doesn't seem to 
>be in enum.c.

`index' is not helpful because one cannot access the object after
calling of `each' via `index' for some classes, e.g., IO. It was the
reason of discarding, maybe. `size' and `length' were obsoleted too.

However, we have another option, i.e., !IO<Enumerable.  To discuss
this problem, we should obtain `What is Enumerable?'.  In current
Ruby, Enumerable means a sequential access object at least once while
the another says Enumerable means Array interface.  Cle and Matz
disscussed ago.  

-- gotoken