if.rb

# This isn't necessarily "better", or even "useful" in any way, just sort of fun.

class Object
  # I like how I can actually create methods with these names.
  def if
    @__if_result = yield self
    self
  end
  def then
    @__if_result ? yield self : self
  end
  def else
    @__if_result ? self : yield self
  end
end

# code sample from elsewhere.
# http://github.com/nateware/redis-objects/blob/master/ATOMICITY.rdoc
@course = Course.find(1)
if @course.num_students < 30
  @course.course_students.create!(:student_id => 101)
  @course.num_students += 1
  @course.save!
else
  # course is full
end

# revised version.
Course.find(1).if { |course| 
  course.num_students < 30
}.then { |course|
  course.course_students.create!(:student_id => 101)
  course.num_students += 1
}.else { |course|
  # Do nothing!
}.save!