From: Mark Wilson <mwilson13@...>
Date: 2003-06-10T05:22:35+09:00
Subject: Re: array.uniq does not use == ?


On Monday, June 9, 2003, at 03:47 PM, Orion Hunter wrote:

> [snip many interesting things I want to think about]

> And, actually, after taking a closer look at the solution you 
> provided... I'm not too sure I see how would work.  Doesn't .inspect 
> also return the Object.hash attribute of the object, which, unless 
> defined otherwise, will be different for every object?  This would 
> then make each object different, even if all the other attributes are 
> the same.
>
> Matt
> [snip]

For Sets and Arrays, .inspect does not return the Object.hash 
attribute.  See below.  I have not examined this behavior for all 
object classes.  Others on the list may be able to precisely explain 
what is going and offer a more elegant solution.

irb(main):001:0> require 'set'
=> true
irb(main):002:0> set = Set.new([1,2,3,4,5])
=> #<Set: {5, 1, 2, 3, 4}>
irb(main):003:0> set.inspect
=> "#<Set: {5, 1, 2, 3, 4}>"

  array = [Set.new([1,2,3]), Set.new([4,5,6])]
=> [#<Set: {1, 2, 3}>, #<Set: {5, 6, 4}>]
irb(main):008:0> array.inspect
=> "[#<Set: {1, 2, 3}>, #<Set: {5, 6, 4}>]"

Regards,

Mark