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
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.
- 1One 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) { …
- 2In 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’…
- 3The 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…
- 4As 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….
- 5As 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; …
- 6In 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…
- 7When 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…
- 8A 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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