How to use Partial Types with Mapped Types In Typescript
Mapped types in TypeScript allow you to create new types by transforming each property in an existing type. Partial types can be effectively used with mapped types to create new types with optional or modified properties based on the original type.
Syntax
type PartialType<T> = { [P in keyof T]?: T[P] };
Example: The below code will use the partial types to create mapped types.
Javascript
type PartialType<T> = { [P in keyof T]?: T[P] };interface User { name: string; age: number; email: string;}type PartialUser = PartialType<User>;const partialUser: PartialUser = { name: 'w3wiki' };console.log("Partial User:", partialUser); |
Output:
Partial User: { name: 'w3wiki' }
How to Use Partial Types in TypeScript ?
Partial types in TypeScript offer a versatile solution for creating new types with a subset of properties from existing types. This feature proves invaluable in scenarios where you need to work with incomplete data structures or define flexible interfaces.
Below are the approaches to using partial types in TypeScript:
Table of Content
- Using the Partial
Utility Type - Creating functions with Partial Type Parameters
- Using Partial Types with Mapped Types
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