CHALLENGE 1: Type Annotation Errors
====================================

SOLUTION:

const age: number = 25;
const score: number = 98.5;
function greet(person: string): string {
  return "Hello, " + person;
}

EXPLANATION:
- "age: number = 25" — declares age as a number (even though "25" is a string initially)
- "score: number = 98.5" — score is a number (decimals are fine)
- "person: string" — parameter person must be a string
- ": string" after closing parenthesis — the function returns a string

WHAT WAS WRONG:
- Original age was a string ("25") but should be treated as a number
- The function parameter person had no type, so TypeScript didn't know what type to expect
- Without the return type annotation, it's unclear what greet() returns

KEY INSIGHT:
Function parameters ALWAYS need type annotations so TypeScript (and other developers)
know exactly what type of data the function expects.

TESTING:
greet("Alice")      // ✅ Returns "Hello, Alice"
greet(42)           // ❌ Error: Argument of type 'number' is not assignable to parameter of type 'string'