From: Daniel Carrera <dcarrera@...>
Date: 2003-03-12T08:56:35+09:00
Subject: Re: a newbie question

Use Array#grep

>> %w{ cat dog mouse zebra rhino } 
=> ["cat", "dog", "mouse", "zebra", "rhino"]
>> %w{ cat dog mouse zebra rhino }.grep(/e/)
=> ["mouse", "zebra"]

On Wed, Mar 12, 2003 at 08:51:13AM +0900, Ben Thomas wrote:
> Hi,
> 
> I am trying to create an array from another array using a regular 
> expression to compare them. If an element match the regular expression, 
> then I want it to appears in my new array, otherwise it can be 
> discarded. I have come up with the following code (for example, getting 
> strings than end in 'abba' in an array of string)
> 
> new_array = (array.collect { |x| if( x =~ /abba$/ ) then x else nil end 
> }).compact
> 
> It works fine, but I want to know if there's is a more simple way to do 
> this since I do this a lot in my scripts.
> 
> Thankx,
> Ben.
> 
> 

-- 
Daniel Carrera
Graduate Teaching Assistant.  Math Dept.
University of Maryland.  (301) 405-5137