Ruby

Data driving ruby tests with meta-programming is one of the more elegant examples of meta-programming in my opinion. Understanding that class definitions are active, and you can add methods in a loop is very powerful. class LocationTest < ActiveSupport::TestCase def setup @location = Location.new end {:empty => '', :nil => nil}.each do |key, value| test "address can't be " + key do @location.address = value assert !@location.valid? end end end NUnit has the ability to do the same thing, but attributes and reflection just aren’t as elegant. »

This video is a must watch for experienced developers trying to learn Ruby. It will explain the magic of metaprogramming. »