From: "Eustáquio Rangel" <eustaquiorangel@...>
Date: 2006-05-25T21:56:41+09:00
Subject: What's the main inside the block

Hi there.

I'm wondering what "main" inside a block means.
For example:

%w(one).each { puts self } => main

What is exactly the "main" thing there?

Btw, to make the block recognize the object instance context where it is 
running (on this case, the Array created with %w) the solution is using 
an instance_eval, as the instance_eval description says:

"In order to set the context, the variable self is set to obj while the 
code is executing, giving the code access to obj's instance variables."

Like:

%w(one two three).instance_eval{ each_with_index {|v,i| puts 
"#{i+1}/#{self.size}=#{v}" } }
=>
1/3=one
2/3=two
3/3=three

On this example, used for checking the size of the created object where 
the block is executing.

Thanks!

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