Cool. Thanks for explanation. Pete
Harold wrote: > They are both equivalent in terms of functionality. > > The first is a common rails idiom: > > @some_collection.collect(&:id) > or > @some_collection.map(&:id) #I've seen this one used more than > collect... > > The ampersand syntax is simply telling the interpreter that the symbol > is the block parameter to the method. Internally the to_proc method of > the symbol class is called. > > Here's a reference: > http://apidock.com/rails/Symbol/to_proc > > Beware, doing @foo.map(&:id) doesn't perform as well as @foo.map { |f| > f.id } for big numbers of foos... > Also note that this is a Rails only feature (ie: try it on plain irb > and it will not work). > > On Mar 11, 1:35�pm, Hiro Protagonist <rails-mailing-l...@andreas- -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
