From: Dave Burt <dave@...>
Date: 2006-06-07T15:21:09+09:00
Subject: Re: What's going on here? (Newbie question)

Logan Capaldo wrote:
> I wonder if IO#each should be changed to automatically #rewind at the
> beginning of #each (if possible). I have difficulty imagining a
> situation where someone would purposely do
> a = file.gets
> file.each { ... }
>
> But I can certainly imagine people iterating over a file multiple
> times. OTOH this may be too magical.

Too magical. Streams are often one-way. If you need to read the same
data from the same stream more than once, usually the appropriate
method is to store the data in a variable to avoid that. Instead of:

  f.each {|s| foo }
  f.reset
  f.each {|s| bar }

This may often work better:

  data = f.read
  data.each {|s| foo }
  data.each {|s| bar }

Cheers,
Dave