CHALLENGE 1: Type a Product Object
===================================

SOLUTION:

const product: {
  name: string;
  price: number;
  inStock: boolean;
  description?: string;
} = {
  name: "Laptop",
  price: 999.99,
  inStock: true,
  description: "High-performance laptop for professionals"
};

// Also valid without description:
const anotherProduct: {
  name: string;
  price: number;
  inStock: boolean;
  description?: string;
} = {
  name: "Mouse",
  price: 29.99,
  inStock: false
};

EXPLANATION:
- "name: string" — product name is required
- "price: number" — price is required (decimals allowed)
- "inStock: boolean" — stock status is required
- "description?: string" — optional (the ? means it can be undefined)

KEY POINTS:
- Required properties MUST be present when creating the object
- Optional properties can be omitted
- If you include an optional property, it must match the type

TESTING:
✅ Works: { name: "Phone", price: 499, inStock: true }
✅ Works: { name: "Phone", price: 499, inStock: true, description: "..." }
❌ Error: { name: "Phone", price: "499", inStock: true }  (price should be number)
❌ Error: { name: "Phone", inStock: true }  (price is required!)