From: Robert Klemme <shortcutter@...>
Date: 2008-01-02T20:19:58+09:00
Subject: Re: using reg expr with array.index

On 02.01.2008 05:40, Esmail wrote:
> MonkeeSage wrote:
>>
>> Ps. ruby will normally close open file handles on garbage collection
>> or in finalization, but just in case of some catastrophic failure
>> (what, I'm not sure), it's usually considered good practice to close
>> file handles manually:
>>
>> ...
>>      file=File.open(ARGV[0])
>>      data=file.readlines
>>      file.close
> 
> Ooops, absolutely, that sort of houskeeping needs to be done, I'm good
> doing with C and Java .. not sure why I didn't think about this with Ruby.
> 
> By the way, I know if I do something like
> 
> File.open("bla").each { |line|
>   stuff
> }
> 
> the file gets automagically closed at the end of the block.

I'm sorry, but this is wrong.  You either need to do

File.open("bla") do |io|
   io.each do |line|
     # stuff
   end
end

or

File.foreach "bla" do |line|
   # stuff
end

> What about the example you gave, data=IO.read("bla") ... I assume the
> file gets opened, read and closed in one fell swoop, correct?

This is correct.

Kind regards

	robert