From: Rob Biedenharn <Rob@...>
Date: 2008-09-16T05:53:43+09:00
Subject: Re: array question


On Sep 15, 2008, at 4:42 PM, Nathan Powell wrote:

> On Tue, Sep 16, 2008 at 05:27:03AM +0900, Li Chen wrote:
>> Hi all,
>>
>> Just wonder:
>>
>> 1)When substracting array2 from array1 to get the difference elements
>> between two arrays(array1-array2), must array1.size >= array2?
>
> irb is great for this stuff.
>
>>> [1, 2] - [1, 3, 4]
> => [2]
>
>> 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]
>
> --  
> nathan
> nathan_at_nathanpowell_dot_org
>
> What kind of crazy nut would spend two or three hours a day just  
> running?
> 		 ~ Steve Prefontaine
> ------------------------------------

irb> (a1 | a2) - (a1 & a2)
=> [2, 3, 4, 7]

-Rob

Rob Biedenharn		http://agileconsultingllc.com
Rob@AgileConsultingLLC.com