This in-depth guide will walk you through everything you need to know to leverage the capabilities of TypeScript for your projects.
What is the main reason to use TypeScript?
There are many reasons to use TypeScript but the primary motivator for a lot of developers is the increased error detection and handling capabilities that help us write more robust and maintainable code.
Where is TypeScript mostly used?
What is a TypeScript interface?
A TypeScript interface is how we can define the structure of an object by specifying the properties and methods that are on the object. They’re primarily used for type-checking.
When should I use interfaces in TypeScript?
You’ll use interfaces in various places in TypeScript, but most commonly, when you want to define the structure of an object and ensure type safety.
What is the main difference between types and interfaces in TypeScript?
While a type and interface are very similar and are often interchangeable, the primary difference is that an interface can be freely extended at any point while a type can’t. Read more on Types vs. Interfaces on the TS docs here.
What are the types of TypeScript interfaces?
While there aren’t different types of interfaces, they can be used in various different ways, such as function types, object types, optional properties, index signatures, and more.
What is a generic in TypeScript?
A generic is a placeholder for a future type to be passed in. They’re like a template that can be reused multiple times, with different types being passed in each time.
Why use TypeScript generics?
Generics offer multiple benefits to TypeScript developers, but chiefly they allow us to write reusable and flexible code without sacrificing type safety.
How do you write generics in TypeScript?
You can write a generic by wrapping a type in angled brackets after a function, class, or interface name; for example,
<GenericType>. You can then use this name as a placeholder in the code to represent the type that will be passed in when calling the function, class, or interface.