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Object Types Basics
6 exercises
Objects model real-world entities. In TypeScript, you describe an object's shape by listing its properties and their types:
const user: { id: number; name: string } = {
id: 1,
name: "Alice"
};Shapes are structural—if a value has at least those properties with the right types, it matches the shape.
Key concepts:
- Optional properties – Mark with
?like{ first: string; last?: string } - Readonly properties – Prevent changes with
readonly id: number - Excess property checks – Catch typos when passing object literals
In this category, you'll:
- Define object shapes for entities like users, products, and points
- Handle optional data safely (checking for
undefined) - Return new objects without mutating inputs
- Understand structural typing and common pitfalls
By the end, you'll be comfortable modeling real-world data with TypeScript's object types.