best way to add a method to the Array class

rubyonrails-talk
1

Ruby classes are open, so you can simply do:

class Array   def sum      inject(0) { |sum,v| sum+=v }   end end

You can also redefine existing methods, but you'll have to be very careful with that. alias is your friend.

Cheers, Max

2

where would that code snippet go?

In the application controller?

No. Create a new file under lib, for example array_extensions.rb and you should be fine.

Max