Today's mission involves leveraging various programming principles in Go to tackle complex tasks effectively. When principles like Encapsulation, Abstraction, Polymorphism, and Composition are blended, the resulting code becomes streamlined and easier to manage.

Our goal is to explore two real-world examples, demonstrating how these principles can seamlessly orchestrate solutions using structs, interfaces, and composition in Go.

We'll design an online library system to reinforce our understanding of Encapsulation and Polymorphism in Go. Encapsulation will help us guard the attributes of books, members, and transactions, ensuring controlled access. Polymorphism will illustrate its utility by enabling a single interface to represent different underlying forms, such as digital and print versions of books.