How to Implement the Visitor Pattern Correctly | HackerNoonUsing the Visitor pattern with instanceof checks leads to code maintainability issues.
Universal vs. Existential Types: Is It For All or Existential Crisis?Universal types allow code to work with any type due to their polymorphic nature, while existential types signify the existence of some unknown types.
Bounded Quantification: Why Your Types Need Boundaries Even If You Don't!Universal quantifiers are contravariant as they must operate on all subtypes of a defined bound.Existential quantifiers are covariant since they represent the existence of some specific type within a bound.
What are overloading and overriding in JavaMethod overloading allows methods to have the same name but different parameters, improving readability.Method overriding enables subclasses to provide specific implementations of superclass methods.
Learn What is Interface in PHP with Example | SimplilearnInterfaces in PHP define methods a class should implement, promoting polymorphism and multiple class implementations.