From: Joel VanderWerf <vjoel@...>
Date: 2008-09-16T06:04:43+09:00
Subject: Re: array question

Nathan Powell wrote:
> On Tue, Sep 16, 2008 at 05:27:03AM +0900, Li Chen wrote:
...
>> 2)Is there mentod in Array class that can  return the element only
>> unique to either of two arrays?
> 
> http://ruby-doc.org/core/classes/Array.html
> 
>> For example, array1=[1,2,3],array2=[1,4,7]
>> the return array is [2,3,4,7]
> 
> 
> There might be a better way, but I came up with:
> 
>>> ([1, 2, 3] - [1, 4, 7]) + ([1, 4, 7] - [1, 2, 3])
> => [2, 3, 4, 7]
> 

Or:

   (a1|a2) - (a1&a2)

Or:

  require 'set'
  Set.new(a1) ^ Set.new(a2)


(I thought I remem