#polymorphism

#polymorphism

Imagine you're working with a third-party library that provides a User class. You need to add JSON serialization to it, but you can't modify the source code. Of course you can create a wrapper class or extend it, but that feels clunky and breaks existing code that expects the original type. This is where type classes shine. They're one of Scala's most powerful patterns, and they're the secret ingredient in popular libraries like Cats, Scalaz, and Circe.

The magic method __call in PHP is invoked when an undefined method is called, allowing dynamic method handling at runtime.

Replacing nullable optional attributes with empty collections helps eliminate null checks in code, significantly enhancing maintainability and leveraging polymorphism in design.