design patterns

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2021-08-04:
I was thinking on how I would go about learning the design patterns in the GoF book. I think the angle of entry i would go ahead with is thinking, without input from the book, about each of the intents that are listed alongside the patternname:

Intents
- How do you represent an operation to be performed on the elements of an object structure?
  - Case Study: Abstract Syntax Trees
  - I'll assume object structure here also refers to C++ structs
  - So, what kind of operation is to be performed on the elements of a struct?
    - If the elements of the structs are of different types, why would we want to perform one type of operation on them? Is it even possible?
    - The operation itself, is it not just a regular function?
    - What then do you mean by representation for a function?
      - Shouldn't that just be its code?
- How do you allow an object to alter its behavior when its internal state changes? (The object will appear to change its class)
  - Case Study: TCPConnection
- How do you define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and update automatically.
  - Case Study: GUI toolkits
- How do you capture and externalize an object's internal state so that the object can be restored to this state later?
  - Case Study: Graphical Editor
- How do you access the elements of an aggregate object sequentially without exposing its underlying representation?
  - Case Study: Traversing a List
- How do you encapsulate a request as an object, (thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations.)
  - Case Study: user interface toolkits include objects like buttons and menus that carry out a request in response to user input
- How do you avoid coupling the sender of a request to its receiver (by giving more than one objects a chance to handle the request?)
  - Case Study:
I've not thought well-enough about how classes/OOP impact code performance, does it? I like how a solution to this problem (invalid transactions) was cleaned-up by making use of classes.
- https://softwareengineering.stackexchange.com/questions/125753/does-object-orientation-really-affect-algorithm-performance
- https://softwareengineering.stackexchange.com/questions/272298/relation-between-object-orientation-and-algorithms?rq=1
- https://softwareengineering.stackexchange.com/questions/239045/what-is-the-relationship-between-data-structures-and-algorithms
- questions like these that are always stated using OOP constructs like classes (design a leaderboard, LRU Cache, etc.)
Object-Oriented Design

design patterns

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