Learn TypeScript: Course OverviewCourse Overview

Advanced Object Types

Go further and advance your knowledge of TypeScript to use interfaces and other means of typing objects.

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Key Concepts

Review core concepts you need to learn to master this subject

TypeScript Interface Type

TypeScript Interface Define Objects Only

TypeScript Interface for Classes

TypeScript Nested Interface

TypeScript Nesting Interfaces Inside an Interface

TypeScript Interface Inheritance

TypeScript Interface Index Signature

TypeScript Interface Optional Properties

TypeScript Interface Type

interface Publication {
  isbn: string;
  author: string;
  publisher: string;
}

TypeScript allows you to specifically type an object using an interface that can be reused by multiple objects. To create an interface, use the interface keyword followed by the interface name and the typed object.

Advanced Object Types

Lesson 1 of 1

1
Introduction
One of the challenges of writing TypeScript is knowing how to apply types in every situation we’ll encounter within our code. Take a look at this example: class Robot { identify(id: number) { …
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2
Interfaces and Types
In TypeScript, we can define types in a variety of ways to fit our code. We’ve used the type keyword to define types, however, there’s another way to define types with the interface keyword. Here’…
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3
Interfaces and Classes
The interface keyword in TypeScript is especially good for adding types to a class. Since interface is constrained to typed objects and using class is a way to program with objects, interface and c…
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4
Deep Types
As our programs grow and become more complex, we’ll need to add more methods and properties to our objects to accommodate more features. In fact, we may need to add nested methods and properties….
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5
Composed Types
As our data gets nested deeper, we’ll start to have typed objects that become unwieldy to write and read. Take the following type: interface About { general: { id: number; name: string; …
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6
Extending Interfaces
In TypeScript, it’s not always enough to be able to compose types together. Sometimes it’s convenient to copy all the type members from one type into another type. We can accomplish this with the e…
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7
Index Signatures
When typing objects in TypeScript, sometimes it’s not possible to know the property names for an object, like when we get back information from an outside data source/API. While we may not know the…
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8
Optional Type Members
A common scenario in programming is creating a function or class that can take in many arguments, some of which are required, and some that are optional. Every interface within this lesson so far a…
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9
Review
🙌 Way to go! You have advanced through this entire lesson. No one will object to your superior TypeScript knowledge. Here’s an overview of what we learned: - We can use both interface and type…
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