Utility Types
TypeScript offers an array of utility types that can transform existing types in various ways, enhancing flexibility and ensuring type safety. Among these utility types, Partial and Required stand out as especially beneficial for developers.
The Partial utility type makes all properties of a provided type optional. This can be helpful in situations where you might not have values for all properties of a type, such as when dealing with updates or partial data fetches.
type Point = {
x: number;
y: number;
};
type PartialPoint = Partial<Point>;
With PartialPoint, both x and y properties become optional, so you can have objects like { x: 10 } or { y: 5 } or even {} without any type errors.
Conversely, the Required utility type does the opposite of Partial. It ensures that all properties of a given type are required. It can be particularly useful when you have a type with optional properties but then need to ensure a complete object for certain operations.
Exercise
Imagine a scenario where you first dealt with partial data, and later in your application, you need to ensure the data's completeness. Use the Required utility type to transform our PartialPoint type, making sure all its properties are mandatory.
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