Welcome to TypeScript!

TypeScript is JavaScript with syntax for types. It helps catch errors early and makes code more reliable.

What is TypeScript?

• Superset of JavaScript: All valid JS is valid TS
• Type Safety: Catch errors before runtime
• Better IDE Support: Autocomplete and intellisense
• Compiles to JavaScript: Runs anywhere JS runs

Why TypeScript?

// JavaScript - error at runtime
function greet(name) {
  return "Hello, " + name.toUpperCase();
}
greet(123); // Runtime error!

// TypeScript - error before running
function greet(name: string) {
  return "Hello, " + name.toUpperCase();
}
greet(123); // Compile error - type mismatch!

Task: Understand the benefits of type safety.