Basic Principles

Question 1

What are the 4 pillars of OOP

Answer 1

A PIE

1) Abstraction
2) Polymorphism
3) Inheritance
4) Encapsulation

Question 2

Describe abstraction

Answer 2

= is an extension of Encapsulation
= you can hide the details of how data is stored and used within a class.

• Only exposes the Properties and Methods

Question 3

Describe polymorphism

Answer 3

= allows objects of different classes to be treated as objects of a common superclass.

It enables methods to be invoked on objects without knowing their specific types, leading to more flexible and reusable code.

= uses inheritance and interfaces?

Question 4

Describe Inheritance

Answer 4

= allows a class (subclass) to inherit attributes and methods from another class (superclass).

• It promotes code reuse and facilitates the creation of hierarchies of related classes.
• allows us to create more specific versions of an existing class

Question 5

Describe Encapsulation

Answer 5

= idea that you package everything an object is and can do into a class

= helps hide the internal implementation details of an object and provides access through well-defined interfaces.

Question 6

What are the SOLID principles?

Answer 6

S = Single-responsibility
O = Open-closed
L = Liskov Substitution
I = Interface Segregation
D = Dependency Inversion