Object Types & Type Aliases

const patient: { name: string; age: number; ward?: string } = { name: "Neema", age: 34 };

• Each property has a type. • ? makes it optional — its type becomes string | undefined. • Missing required properties and misspelled properties are errors.

TypeScript also infers object types: const car = { make: "Toyota", year: 2019 } has type { make: string; year: number }.