From: Love U Ruby <lists@...>
Date: 2013-05-24T19:44:09+09:00
Subject: Learning and stuck `OpenStruct` standard library of Ruby

Hi,

I was learning Ruby's standard library `OpenStruct`. And doing so,out of
curiosity wrote the below code:

require 'ostruct'

person = OpenStruct.new
person.name    = "John Smith"
person.age     = 70
person.pension = 300

p person.instance_variables #=> [:@table, :@modifiable]

Now my question is - Where the above 2 instance variables have been
defined? What are their uses.

On the same not I also not able to understand the method `#modifiable`.
(http://www.ruby-doc.org/stdlib-2.0/libdoc/ostruct/rdoc/OpenStruct.html#method-i-modifiable).

Can any one help me to understand the same?

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