Definition The singleton pattern ensures a class has only one instance and provides global access. Scenario We want to have a globally accessible place to hold stuff. Many people argue that ...

Definition The abstract factory pattern provides an interface for creating families of related or dependent objects without specifying their concrete classes. The abstract factory pattern and the...

Definition The factory method pattern defines an interface for creating an object but lets its subclasses decide the instantiate logic. The factory method enables the class to (the end result) def...

Definition A decorator pattern attaches additional responsibilities to an object dynamically (at runtime). Decorators provide a flexible alternative to subclassing for extending functionalities. S...

Definition The observer pattern defines a one-to-many dependency between objects. So that when it (the observable) changes its state, all of its dependencies are notified. Scenario Instead of maki...

Definition The strategy pattern defines a families of algorithms and lets the clients choose from it and can change independently. Scenario Inheritance is not for code reuse. Inheritance shares co...

Reading Date: Dec 23, 2022 ~ Feb 8, 2023 Order out of Chaos When dealing with complicate physical systems, we will make assumptions and consider ideal situations first, and then start adding f...

Reading Date: Dec 12, 2022 ~ Dec 18, 2022 Contradictions and Our Attempt to Combining Them General relativity and quantum mechanics cannot both be right, at least in their current forms, becau...

Reading Date: Sep 29, 2022 ~ Nov 9, 2022 A present that is common throughout the whole universe does not exist Physics describes how things evolve in their own time and how these times evolve ...