OOP (Course 2): Services, Dependency Injection and Containers

Time to take things up a notch!

In this Course, we'll leverage what we learned in Course 1 to really start using what we know. We'll clean up old functions with new classes, learn a practice called dependency injection and organize our objects into something called a container. This is the course that really makes objects useful and sets us up for future stuff (inheritance, interfaces, etc).

So let's get serious:

• Service Classes
• Organize with private functions
• Goodbye arrays, hello BattleResult
• Objects passed by Reference
• Query from the Database, but using Objects!
• Dependency Injection!!!
• Creating a Service Container

Do it!

• Service Classes
• An Army of Service Classes
• Sharpening the Battle Result with a Class
• Optional type-hinting & Semantic Methods
• Objects are Passed by Reference
• Fetching Objects from the Database
• Handling the Object Id
• Making only one DB Connection with a Property
• OO Best Practice: Centralizing Configuration
• OO Best Practice: Centralizing the Connection
• Service Container
• Container: Force Single Objects, Celebrate
• Container to the Rescue