From: Frederick Cheung <frederick.cheung@...>
Date: 2008-08-19T18:44:27+09:00
Subject: Re: Array API


On 19 Aug 2008, at 10:06, Tushar Gandhi wrote:

> Hi,
>  I am going through the ruby Array API. In the API , there is  
> staetment
>
> Included Modules
> Enumerable
>
> Is this means that we are inheriting the enumerable class to array?
>
Not inheriting. That means the Enumerable module is mixed in to Array  
(and similarly to Hash and other collections)

> Also there is sort_by method for the enumerable object, but I am  
> able to
> use this method for array of object.
>
> I have this type of array of Object:-
> [#<UserDemo:0x89a5bd4 @attributes={"email3"=>nil, "lastname"=>"aikhe",
> "firstname"=>"mita", "id"=>"1"}>,#<UserDemo:0x89a5bd4
> @attributes={"email3"=>nil, "lastname"=>"aikhe", "firstname"=>"na",
> "id"=>"2"}>]
>
> How it is possible that we are able to use enumerable sort_by method  
> for
> an array of object?
>
Because that's what including a module does: it adds the methods  
defined in the module to the class.

Fred