Interview Q&A / Object-Oriented Programming

1. How does dependency injection make unit testing easier?

   Because the class receives its collaborators, a test can pass in a fake instead of a real database, network or clock. The test runs fast and gives the same result every time.

   BeginnerQuick answer1 min read
2. Why do many developers call Singleton an anti-pattern?

   It is global state in disguise: hidden dependencies, hard-to-reset state between tests, tight coupling to one concrete class, and trouble when you later need two instances.

   IntermediateQuick answer1 min read