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TypeScript Academy · Lesson

Pick and Omit: Selecting Properties

Create subtypes by including or excluding keys.

Lesson 2 of 413 steps

Pick and Omit: Selecting Properties is a free TypeScript Academy lesson on CoddyKit. This is lesson 2 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the TypeScript Academy learning path, and your progress syncs across the web and the CoddyKit app. The TypeScript Academy course includes 4 lessons in total.

Welcome

Pick creates a type with only the specified properties. Omit creates a type without the specified properties. They are complementary tools for shaping object types.

Pick<T, K>

Keep only the listed keys from T.
interface User { id: number; name: string; email: string; role: string; }
type PublicUser = Pick<User, 'id' | 'name'>;
// { id: number; name: string }

Omit<T, K>

Remove the listed keys from T.
type UserWithoutRole = Omit<User, 'role'>;
// { id: number; name: string; email: string }

Pick for View Models

Use Pick to create a view model from a full data model for display purposes.
type UserCard = Pick<User, 'name' | 'email'>;

Omit for Create DTOs

Use Omit to create an input type that excludes auto-generated fields.
interface Post { id: number; title: string; content: string; createdAt: Date; }
type CreatePost = Omit<Post, 'id' | 'createdAt'>;
// { title: string; content: string }

How Pick Is Implemented

Pick uses a mapped type constrained to the keys K.
type Pick<T, K extends keyof T> = { [P in K]: T[P] };

How Omit Is Implemented

Omit combines Pick with Exclude to select all keys except the omitted ones.
type Omit<T, K extends keyof any> = Pick<T, Exclude<keyof T, K>>;

Pick with Union Keys

Provide a union of key literals to Pick.
type MinimalUser = Pick<User, 'id' | 'email'>;

Omit with Multiple Keys

Omit multiple keys at once.
type SafeUser = Omit<User, 'password' | 'token' | 'internalId'>;

Pick vs Interface Subset

Pick is reusable across many types. Defining a new interface subset is one-time. Use Pick when the source type may change.

Combining Pick, Omit, and Partial

Combine utility types to build complex update shapes.
type UpdatePost = Partial<Omit<Post, 'id' | 'createdAt'>>;
// Can update title and content, both optional

Quick Check

What is the result of `Pick` given `interface User { id: number; name: string; email: string }`?
Answer it in the interactive lesson

Recap

Pick keeps only listed properties. Omit removes listed properties. Use them to create view models, DTOs, and update types without duplicating interface definitions.
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Frequently Asked Questions

Is the “Pick and Omit: Selecting Properties” lesson free?

Yes — the full text of “Pick and Omit: Selecting Properties” is free to read here on the web. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the TypeScript Academy course, upgrade to CoddyKit PRO. The TypeScript Academy course includes 4 lessons in total.

What will I learn in “Pick and Omit: Selecting Properties”?

Create subtypes by including or excluding keys. You practise TypeScript Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start TypeScript Academy?

No prior experience is required. TypeScript Academy on CoddyKit is structured for beginners through advanced learners, so you can start here or from the beginning and move at your own pace. This is lesson 2 of 4.

How long does the “Pick and Omit: Selecting Properties” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this TypeScript Academy lesson?

Yes. Every TypeScript Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

All lessons in this course

  1. Partial and Required: Toggling Optionality
  2. Pick and Omit: Selecting Properties
  3. Record: Mapping Keys to Value Types
  4. Readonly, Exclude, Extract, NonNullable
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