Ruby on Rails

I am not the author. But, I am having some trouble trying to understand
it. There is currently, I think only the binary implementation form
http://rubygems.org, but looking into the actual gem it seems there are
some c extensions.

My concern comes from the following code from the github posting:

cup = Coffee.new.enrich(milk).enrich(sprinkles).enrich(sprinkles)
# or even..
cup = Coffee.new.enrich milk, sprinkles, sprinkles

cup.cost.should == 2.10
cup.should be_instance_of(Coffee)
cup.injectors.should == [:milk, :sprinkles, :sprinkles]

What does this mean?

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