From: Ch Ba <navouri@...>
Date: 2009-06-19T03:57:05+09:00
Subject: Re: Modifying data in an array using a reference

Joel VanderWerf wrote:
> Ch Ba wrote:
>>  Ok so my situation is as follows. I have an array "foo", which contains
>> several instances of the class "bar". I get a copy of an object inside
>> of "foo" using  foo.detect, and then modify that copy. Afterwards, I
>> need to replace the original inside the array with the modified version.
>> The problem is that I do not know the index of the object. How would I
>> go about doing that? I could use some help =)
> 
> You're working with the original foo, not a copy, so you don't need to
> replace the entry at a certain index:
> 
>    class Bar
>      attr_accessor :x
>      def initialize x
>        @x = x
>      end
>    end
> 
>    foo = [Bar.new(0), Bar.new(1)]
>    p foo
> 
>    bar = foo.detect {|bar| bar.x > 0}
>    bar.x = "changed"
>    p foo
> 
> [#<Bar:0xb796c988 @x=0>, #<Bar:0xb796c974 @x=1>]
> [#<Bar:0xb796c988 @x=0>, #<Bar:0xb796c974 @x="changed">]


 Thank you very much for the quick answers. I realized what I was doing 
wrong and was in the process of fixing it when I remembered I should 
remove my post. The issue was a mistake in the initialization of the 
class and had nothing to do with accessing the array. I was really 
confused about why it didn't seem to be modifying the original.
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