Object-Oriented Design

These are notes taken from a physical copy of the book "Practical Object-oriented Design: An Agile Primer Using Ruby, Second Edition" by Sandi Metz.

Chapter 1: Object-Oriented Design

  • the world is procedural (e.g. time flows forward and events pass by) but it is also object-oriented (e.g. objects have their own behavior)

  • new arrangements of behavior emerge naturally from a world of objects

  • object-oriented software treats the world as a series of interactions between objects

  • you need to shift from thinking of the world as pre-defined events to modelling the world as a series of messages that pass between objects

    • this is object-oriented design (OOD)

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