From: Ryan Bigg <me@...>
Date: 2010-06-06T08:05:01+09:00
Subject: Re: comparing objects

Robert Dober wrote:
> On Sat, Jun 5, 2010 at 8:55 PM, Rein Henrichs <reinh@reinh.com> wrote:
> <snip>
>> The Array#& operator, like its siblings, uses the #hash and #eql? methods of
>> the objects it compares. These must be the same for objects you want to be
>> considered equivalent.
>>
> I must have made a stupid mistake in my example code, however, this is
> no reason to mess with #eql? and #hash, Be warned.
> In that case I stick with Robert's advice: Do not use Array#&, even
> MPing Array with something like #intersect_by would be preferable.
> 

Wow. Sorry, I am just stunned by this, so no sugar coating for you 
today.

Array#& is a perfectly legitimate method to be using for the purpose of 
finding the intersect of two Array objects, which it seems what the OP 
wanted to do originally.

I agree with Rein on this.


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