A. Pick
Use pick to create a new type from a previous type with only a few necessary keys.
interface User {
name: string;
age: number;
}
type PickUser = Omit<User, 'name'>;
// Resut
type PickUser = {
name: string;
};
B. Omit
While Pick is handy, there are occasions when the inverse operation is required. We may need to construct a type that includes everything except a few fields from a preceding type
interface User {
name: string;
age: number;
}
type OmitUser = Omit<User, 'name'>;
// Resut
type OmitUser = {
age: number;
};
C. Partial
This utility type facilitates swift creation of a type with optional or undefined properties based on an existing type
interface User {
name: string;
age: number;
}
type PartialUser = Partial<User>;
// Resut
type PartialUser = {
name?: string | undefined;
age?: number | undefined;
};