From: Robert Klemme <bob.news@...>
Date: 2005-10-26T01:02:02+09:00
Subject: Re: searching an array

Bill Mustard <bill@jrl.org> wrote:
> Ralph Smith wrote:
>> I have an array of classes source[]
>>
>> I can sort it like this
>> source.sort! { |x,y| x.fname <=> y.fname }
>>
>> If I print it out it is sorted by 'fname'.
>>
>> Now I would like to search it for different fnames but can't find an
>> example of how to do that. Can someone tell me how?
>>
>> thanks,
>> Ralph
>>
>>
>
> I like grep eg.
>
> results = source.grep(/.txt/)
>
> returns a list (array) of entries that contain '.txt'.  (including
> things like fred.txt.bak)

Unlikely that it works in this case as Ralf seems to have instances of a 
custom class in the array.  If you want to make grep work with that you'd 
need to either implement #to_str for this custom class (which I'd find 
inappropriate) or do this

condition = lambda {|x| x.fname == "foo"}
class<<condition
  alias === []
end
source.grep condition

:-)

> Array mixes in (includes) the methods in Enumerable which is where
> much of this magic is hiding.

Yes, among them #inj...  Ok, I'll keep my mouth shut.

Kind regards

    robert