12 - Class Features
12 - Class Features
🚧 Properties, Methods, and Constructors 🏗️
Embedded Files
What are we learning?
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 📖
Recall 📖
Abstract Data Types
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
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 💠
Class Diagram 💠
Declaring a Class 💻
Declaring a Class 💻
// A Playing Card
class PlayingCard {
value;
name;
suit;
colour;
is_face = false;
}
Instantiation 🆕
Instantiation 🆕
let card = new PlayingCard();
card.name = "Queen";
card.is_face = true;
The Lesson 📄
The Lesson 📄
Properties, Methods, and Constructors - Oh My!
Giving our objects functionality 👈 click for the repo
🐿️
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