TypeScript Intermediate: Classes

Name: TypeScript Intermediate: Classes
Author: Mark Nair

Learn about object-oriented programming with classes.

Preview the first lesson free — get full access to all 5 lessons.

Course: On-Demand

Hi, my name is Mark Nair, and in these lessons, you'll learn about using classes and object-oriented coding in TypeScript. Classes help us organize our code and ideally make your work more efficient and effective. Think about a class like a blueprint, a blueprint to a house. It's the plan and the instructions of how you create the house or the object. Let's say you have a handful of bicycles. There's a tricycle, a unicycle, a beach bike, an exercise bike, a road bike, and an e-bike. Instead of creating individual objects for each of these different bicycles, we can instead derive all of them from one blueprint or the keyword is class. In this case, we'll simply just create a class called bicycle, even better, since some of these have two wheels and some have three. The word bicycle really makes no sense, so we can instead make them all part of a class that we can call vehicle. Then from here on, we can make instances of the class, basically what we are deriving from the class. Think about that blueprint again. Let's say we have a blueprint to make a car. Every car object we make from that blueprint, we call it an instance of that car. In our vehicle example, when we create a tricycle object, it's really an instance of the vehicle. This means we can use standard object-oriented patterns. A fundamental one is our way to extend the class to make new classes using inheritance. What this means is that the new class will inherit the properties and methods of the base class. This is the class we've extended. We can call this new class subclass or new classes, subclasses that come from the superclass. This is a very short and compact description of classes and inheritance. There are full college level classes that spend their time exclusively on object-oriented design and some of its pitfalls too. For us though, it's more important to jump right into it with the language so I can show you how TypeScript uses these techniques to help you write safer and cleaner code. Let's do that right now. Thanks for watching. Stay tuned for the next lesson where I'll show you how to create a class in TypeScript.

Intermediate Provider : Mark Nair 5 Lessons · 22m in English

Course Description

‏Learning to use classes, inheritance, and object-oriented coding in TypeScript can significantly enhance your ability to write organized, efficient, and scalable code. TypeScript is a superset of JavaScript that introduces strong typing and class-based object-oriented programming (OOP) features.

‏In these lessons, you will understand the fundamental concept of a class. A class is a blueprint for creating objects with shared properties and behaviors. In TypeScript, class declarations use the class keyword followed by the class name, and methods and properties are defined within curly braces. We’ll also cover inheritance, a crucial aspect of OOP. Inheritance allows one class to inherit properties and methods from another class, creating a hierarchical relationship that reduces redundancy and promotes code reusability.

‏We’ll also introduce the concept of encapsulation, which emphasizes hiding internal implementation details of classes and exposing only essential functionalities. TypeScript achieves encapsulation through access modifiers such as public, private, and protected. ‏Abstraction involves defining the essential characteristics of an object while hiding irrelevant complexities.

What You'll Learn

Understand the fundamental concept of a class as a blueprint for creating objects with shared properties and behaviors
Create classes in TypeScript using the class keyword, with methods and properties defined within curly braces
Apply inheritance to let one class inherit properties and methods from another, reducing redundancy and promoting reusability
Use constructors and functions within a class
Apply encapsulation through access modifiers such as public, private, and protected to hide internal implementation details
Install TypeScript, use it with your IDE, the TypeScript playground, and within an HTML file

Key Takeaways

TypeScript is a superset of JavaScript that introduces strong typing and class-based object-oriented programming features.
A class is a blueprint for creating objects with shared properties and behaviors, declared with the class keyword followed by the class name.
Inheritance allows one class to inherit properties and methods from another, creating a hierarchical relationship that reduces redundancy and promotes code reusability.
Encapsulation hides the internal implementation details of classes and exposes only essential functionalities, achieved through access modifiers such as public, private, and protected.
Abstraction involves defining the essential characteristics of an object while hiding irrelevant complexities.

Frequently Asked Questions

What does this course cover?

It covers using classes, inheritance, and object-oriented coding in TypeScript, including creating classes, inheritance, using constructors and functions in a class, plus encapsulation through access modifiers (public, private, protected) and abstraction.

What object-oriented programming concepts will I learn?

You will learn about classes, inheritance, encapsulation, and abstraction as they apply in TypeScript.

What lessons are included?

The lessons are Introduction to Classes, Creating a Class, Inheritance, Using Constructors in a Class, and Using Functions in a Class.

What setup-related skills does the course include?

The learning objectives include understanding how to install TypeScript, using TypeScript with your IDE, the TypeScript playground, and using TypeScript in an HTML file.

How does TypeScript relate to JavaScript in this course?

The course explains that TypeScript is a superset of JavaScript that introduces strong typing and class-based object-oriented programming features.