Definition and Usages
Explore how mapped types in TypeScript enable you to transform existing interfaces into new types efficiently. This lesson shows how mapped types avoid code duplication and ease maintenance by automating type transformations, setting the foundation for advanced generic programming.
We'll cover the following...
We'll cover the following...
What is the mapped type?
The mapped type allows for creating a new type from an existing one. Using the term map refers to pointing existing members to a new type by a custom logic that is unique to the mapper implementation.
A good example is to have an existing interface keep all the same members, but make them optional or read-only.
Advantages of the mapped type
First advantage
The mapped type has two advantages over the previous versions ...