Interview Q&A / Object-Oriented Programming

1. In the Dependency Inversion Principle, who should own the interface: the high-level or the low-level module?

   The high-level module. It declares the interface in terms of what it needs, and low-level modules implement it. That is what inverts the dependency direction.

   AdvancedQuick answer1 min read
2. What is the difference between a Service Locator and Dependency Injection?

   With DI, dependencies are handed to the class from outside. With a Service Locator, the class asks a global registry for them. The locator hides what the class needs and makes testing harder.

   AdvancedQuick answer1 min read