🎯 Learning Objectives

By the end of this class, students will be able to:

• Understand what functions are and why we use them.
• Create and call functions correctly.
• Use parameters and arguments.
• Use the return keyword to send back values.
• Understand function scope (basic).
• Write real-life programs using functions.

1. What Are Functions?

A function is a reusable block of code that performs a specific task.

💬 Easy Example (Real Life):

• The calculator + button is a function.
• The washing machine start button runs the same function every time.
• Calling pizza shop → same "order-taking" function runs for every customer.

📘 Without function:

console.log("Hello Ali");
console.log("Hello Sara");
console.log("Hello Hamza");

📘 With function:

function greet() {
  console.log("Hello");
}
greet();
greet();
greet();

✅ Cleaner

✅ Reusable