From: Bharat Ruparel <bruparel@...>
Date: 2007-02-09T23:39:18+09:00
Subject: Re: Iterators and blocks question

Thanks Robert,
Tim Hunter's solution seems most straightforward to me.  Which is:
counter = 1
IO.foreach("test.txt") {|line| puts "#{counter}. #{line}"; counter += 1}

The solution that you present:
 require 'enumerator'
 IO.to_enum(:foreach, "test.txt").inject(0) do |counter, line|
    puts "#{counter}. #{line}"
    counter + 1
 end

Seems like a good one too, except more indirect.  When would you 
recommend using one over another?  Or is it largely a matter of taste? 
Also, why do you have to "require" the enumerator module here whereas 
Tim's solution didn't. I did a search on "ri IO" and it shows that IO 
includes enumerable (it is not enumerator, I know).  Also it shows that 
foreach is a class method for IO class whereas I could not find anything 
on to_enum.  Is there a way to get RoR style online API docs for Ruby? 
I find "ri" a bit primitive.

Bharat

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