TypeScript Interfaces & Abstract Classes Tutorial

Learn how to use interfaces and abstract classes in TypeScript. This tutorial covers the most common errors when working with interfaces and abstract classes. It will also show you how to use access modifiers to apply the information hiding principle.

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Timeline:
00:00 Introduction
00:18 Can you use access modifiers with Interfaces?
00:34 What are access modifiers?
00:43 The public data modifier
01:13 The private data modifier
01:18 Error TS6133 - Is declared but its value is never read
02:45 Error TS1070 - Modifier cannot appear on a type member
04:02 Error TS2420 - Class incorrectly implements interface
05:42 Abstract Classes and Methods
06:41 Error TS2564 - Property has no initializer
07:10 Error TS2391 - Function implementation is missing
08:51 Error TS1029 - Modifier must precede
09:40 The protected data modifier
09:51 Error TS2720 - Class incorrectly implements abstract class
10:10 The extends keyword
10:35 Error TS2377 - Constructors for derived classes must contain a 'super' call
10:51 The super constructor
11:48 Error TS2515 - Non-abstract class does not implement inherited abstract member
13:30 Create a super constructor
14:36 Error TS2445 - Property is protected and only accessible within class
15:05 How to widen / overwrite access modifiers
16:33 Function Overriding
17:07 What is an Interface?
18:56 How to use interfaces with objects
19:15 Error TS2739 - Type is missing the following properties
21:54 Accessing members of base class

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