From: Brian Candler <b.candler@...>
Date: 2011-05-11T17:39:14+09:00
Subject: Re: Starting Method/Class issues

7stud -- wrote in post #997840:
> Next, instead of using a variable inside a string, you can also call a
> function:
>
> def verify(x)
>   if x > 15
>     'valid'
>   else
>     'invalid'
>   end
> end

And another step, say if the number 15 is a property which you want to 
set, is to make a class.

class Verifier
  def initialize(threshold)
    @threshold = threshold
  end

  def verify(x)
    if x > @threshold
      'valid'
    else
      'invalid'
    end
  end
end

v1 = Verifier.new(15)
puts v1.verify(20)
v2 = Verifier.new(25)
puts v2.verify(20)

The Verifier instance objects, v1 and v2, wrap up the 'verify' method 
with some state (instance variable @threshold) which can be used when 
that method is called.

In your case, you might want to build a class with an @ie instance 
variable, so that the methods can have access to @ie without having to 
pass it in each time.

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