Object Orientated Programming

Question 0

Describe the concept of data abstraction

Answer 0

The process where an object only offers the essential information to the outside world, and hides the background information. It essentially acts as a black box system.

Question 1

Describe the concept of encapsulation

Answer 1

An objects data is encapsulated within its methods, protecting it and ensuring it remains uncorrupted.

Question 2

Describe the concept of inheritance

Answer 2

In object orientated programming code can be reused by creating new classes using existing ones as templates. The new class will have the all the fields, and access to the same methods, as it’s ancestor. Additional fields and methods can be added to the new class.

Question 3

Describe the concept of polymorphism

Answer 3

The ability to us an operator or function in different ways.

Question 4

Describe the concept of overloading

Answer 4

When an existing operator or function is made to work on a new data type. A form of polymorphism.

Question 5

Describe dynamic binding

Answer 5

Also called late binding, the process of connecting one program to another, that is to be executed after the call.

Question 6

What is the difference between an object and a class?

Answer 6

A class is a blueprint containing the data fields and methods, but no data. An object is an instance of the class and contains data. It has access to the methods of the class, but does not contain copies of these.

Question 7

What is MVC

Answer 7

Model-View-Controller, a framework for developing programs with user interfaces. It divides the code into 3 interconnected parts.

Question 8

What is the model part of the MVC framework?

Answer 8

The model is the central component of the MVC system, and contains the application data, business rules, logic, and functions. The model should inform associated views and controllers when there are changes to the data.

Question 9

What is the view part of the MVC framework?

Answer 9

The view is any representation of the data show to the end user. It requests information from the model to generate displays.

Question 10

What is the controller part of the MVC framework?

Answer 10

The controller accepts inputs from the user and converts them into commands for the model or view.

Question 11

What does CRUD stand for?

Answer 11

Create Read Update Delete are the 4 basic functions of persistent storage. In SQL this translates into PUT/POST, GET, PUT/PATCH, and DELETE

Question 12

How do you add a comment line to Ruby code?

Answer 12

Use the #