From: Peter Vandenabeele <peter@...>
Date: 2012-02-09T22:31:45+09:00
Subject: Re: please help me quick.

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On Thu, Feb 9, 2012 at 2:25 PM, luk malcik <aport99@gmail.com> wrote:

> a have two object  a(@a=3 @b=4 @c=5)
>                   b (@a=5,@b=5 @=6)
>
> How can I do a+b, the addition of two object...
>

~$ irb
1.9.3-p0 :001 > class A
1.9.3-p0 :002?>   attr_accessor :a
1.9.3-p0 :003?>   end
 => nil
1.9.3-p0 :004 > a = A.new
 => #<A:0x93fd320>
1.9.3-p0 :005 > b = A.new
 => #<A:0x93f77e0>
1.9.3-p0 :006 > a.a
 => nil
1.9.3-p0 :007 > b.a
 => nil
1.9.3-p0 :008 > class A
1.9.3-p0 :009?>   def +(other)
1.9.3-p0 :010?>     result = A.new
1.9.3-p0 :011?>     result.a = self.a + other.a
1.9.3-p0 :012?>     result
1.9.3-p0 :013?>     end
1.9.3-p0 :014?>   end
 => nil
1.9.3-p0 :015 > a.a = 10
 => 10
1.9.3-p0 :016 > b.a = 15
 => 15
1.9.3-p0 :017 > a+b
 => #<A:0x93badb8 @a=25>

I'll leave it to you to extend this to your specific use case.

HTH,

Peter

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Peter Vandenabeele
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