iPhone on Rails – Creating an iPhone optimised version of your Rails site using iUI and Rails 2: After upgrading trawlr.com to Rails 2 I thought I’d make use of some of the new features and attempt to create an iPhone version of the site. With Rails 2 you can create a mime type specifically for the iPhone and then use that format in a respond_to block (along with views such as index.iphone.erb). [IPhone therefore I am. Actually not yet… but I’ll get there.]
Source:

BookCode: A good example of this is that when I write examples using Ruby, I’ve often shied away from using CollectionClosureMethods, even though I use them heavily in my own Ruby code.[And what a clear explanation of those methods in the above.]
Source: Martin Fowler