From: Ned Konz <ned@...>
Date: 2002-07-27T03:39:08+09:00
Subject: Re: Some basic Ruby questions

On Friday 26 July 2002 11:31 am, I wrote:
> On Friday 26 July 2002 11:19 am, Benjamin Sommerfeld wrote:
> > def pictureMethod
> >         executeNativeCommand("ls | grep \"jpg\" > pictures.txt")
> >         pictureFile = File.open("pictures.txt","r")
> >         while(pictureFile.hasMoreLines)
> >                 array.attach(pictureFile.actualLine)
> >                 pictureFile.goOneLineDown
> >         end
> > end
>
> Why would you want to call external programs when Ruby does all of
> that?
>
> array = Dir.new('.').entries.grep(/\.jpg$/)

Which, as Chris pointed out, is more efficiently written as:

array = Dir[ '*.jpg' ]

You might also look at the find module if you need to search a 
hierarchy. To find all the .jpg files in or under the current 
directory:

require 'find'
array = []
Find.find('.') { |f| array << f if /\.jpg$/ =~ f }

-- 
Ned Konz
http://bike-nomad.com
GPG key ID: BEEA7EFE