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Какие utility-типы в TypeScript знаешь?
sobes.tech AI
Answer from AI
In TypeScript, there are several useful utility types that help transform and combine types:
Partial<T>— makes all properties of type T optional.Required<T>— makes all properties of type T required.Readonly<T>— makes all properties of type T read-only.Record<K, T>— creates a type of object with keys K and values T.Pick<T, K>— selects a subset of properties K from type T.Omit<T, K>— excludes properties K from type T.Exclude<T, U>— excludes from type T all types compatible with U.Extract<T, U>— selects from T only those types compatible with U.NonNullable<T>— excludesnullandundefinedfrom type T.ReturnType<T>— gets the return type of function T.Parameters<T>— gets a tuple of parameter types of function T.
Example of using Partial:
interface User {
id: number;
name: string;
email: string;
}
const updateUser = (user: Partial<User>) => {
// can pass only some fields
};
updateUser({ name: "Alice" });
These types help write more expressive and safer code.