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Frontend Academy · Lesson

Utility Types: Partial Required Pick Omit

Transform existing types with built-in utility types to create variations without duplication.

Built-in Utility Types

TypeScript ships with a set of generic utility types that transform other types. They eliminate the need to manually rewrite similar interface variations.

Partial<T>

Makes all properties of T optional. Perfect for update/patch payloads where not all fields need to be provided.

interface User { name: string; email: string; age: number; }

function updateUser(id: string, changes: Partial<User>) {
  // changes.name is string | undefined
  // changes.email is string | undefined
}

updateUser('1', { name: 'Bob' }); // only update name

All lessons in this course

  1. Generics: T extends and constraints
  2. Utility Types: Partial Required Pick Omit
  3. Mapped Types and Conditional Types
  4. Narrowing: typeof instanceof discriminated unions
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