From: trebor777 <mrobert@...777.net>
Date: 2007-10-27T20:22:39+09:00
Subject: Re: find all member in a class




THUFIR HAWAT wrote:
> 
> On Fri, 26 Oct 2007 20:58:01 +0900, Rick DeNatale wrote:
> 
> 
>> class A
>>   def i
>>     @i ||= 42
>>   end
> 
> 
> Some rudimentary explanation please:
> 
> the def is to define a method?
> it's a coincidence that the method name is "i" and the instance variable 
> has the same name, "I"?
> 
> 
> the third line declares an instance variable, "i", what do the "||" do in 
> that line, please?
> 
> 
> 
> thanks,
> 
> Thufir
> 
> 
> 
> 



Yeap "def" is to define a method
It could be a coincidence... or not, depends on what you want to do with
this method... hum Here it's not a coincidence... this method return the
value of the instance variable i (it's a reader accessor) or if it's nil,
set it to 42 and return it.

basically || means "if it's nil do that ", then = assigns the value 42 to @i


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