12 - Class Features
๐ง Properties, Methods, and Constructors ๐๏ธ
What are we learning?
In this lesson we will:
Recall what we've learned so far
Discuss various features of classes (objects)
Properties
Methods
The Constructor
Table of Contents
Recall ๐
Abstract Data Types
Easy to define and use for combining multiple data into one usable variable.
Limited - you can only declare and use one at a time.
Open - you cannot hide or "protect" the data from being read or changed.
We created a Stack ADT to practice the concept.
Classes
Object Oriented Programming (OOP) is a completely different mindset to procedural programming.
Classes are designed using Class Diagrams, part of the Unified Modeling Language (UML).
They are a blueprint of a reproducible "object" - not usable until instantiated with the new keyword.
They can contain properties like .name, .age, and .alive
Class Diagram ๐
Declaring a Class ๐ป
// A Playing Card
class PlayingCard {
ย ย value;
ย ย name;
ย ย suit;
ย ย colour;
ย ย is_face = false;
}
Instantiation ๐
let card = new PlayingCard();
card.name = "Queen";
card.is_face = true;
The Lesson ๐
Properties, Methods, and Constructors - Oh My!
Giving our objects functionality ๐ click for the repo
๐ฟ๏ธ