Partial, Readonly, Record, Pick, Omit
Master key utility types to reshape objects: Partial, Readonly, Record, Pick, and Omit.
Intro
Goal: Reshape object types safely with Partial, Readonly, Record, Pick, and Omit. These tools remove boilerplate and prevent bugs.
Partial
Partial<T> makes all properties optional—perfect for update payloads.
interface User {
id: number;
name: string;
email?: string;
}
type UserUpdate = Partial<User>;
const patch: UserUpdate = { name: "Ada" }; // only changed fields
All lessons in this course
- Generic functions & constraints (extends, default params)
- Partial, Readonly, Record, Pick, Omit
- keyof/indexed access types (intro)