From: Albert Schlef <albertschlef@...>
Date: 2010-02-05T22:01:14+09:00
Subject: Re: Some noob questions

Robert Klemme wrote:
> On 02/05/2010 12:50 PM, Albert Schlef wrote:
>> Robert Klemme wrote:
>>> On 05.02.2010 00:10, Albert Schlef wrote:
>>>> Robert Klemme wrote:
>>>>>     File.foreach(file).each_slice 2 do |name, pwd|
>>>> How is it better than 'File.open(file).each_slice' ?
>>> It closes the file handle properly which your variant doesn't do.
>> 
>> You mean, that in my version the file isn't closed till the file object 
>> gets destroyed by the garbage collector?
> 
> Exactly.
> 
>> I see.
>> 
>> (I assume the enumerator returned by foreach() mimics foreach()'s 
>> behaviour; that is, that it closes the file after the last iteration.)
> 
> It does not _mimic_ the behavior, it _uses_ it!!
> 
> irb(main):002:1> def self.foreach
> irb(main):003:2> if block_given?
> [...]
> irb(main):007:3> else
> irb(main):008:3* Enumerator.new(self, :foreach)
> irb(main):009:3> end
> irb(main):010:2> end

Nice. Pheeew, I still have a long road to walk before I acquire the 
"Ruby way of thinking".

Robert, thanks. Whenever I read your answers here, even to the most 
trivial questions, I'm treated to some eye-opening gems.

I'm generally aware of the power of Ruby, but oftentimes it seems to me 
unleashing it would involve a few lines of code, whereas you do it 
easily in just one line of it.
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