Defining Functions in JavaScript

Functions are reusable blocks of code that perform a specific task. In JavaScript, functions can be defined in multiple ways.

🧱 1. Function Declaration

This is the most common way to define a function.

function greet(name) {
    console.log("Hello, " + name + "!");
}

greet("Alice"); // Output: Hello, Alice!

💡 2. Function Expression

Functions can also be assigned to variables.

const greet = function(name) {
    return "Hi, " + name + "!";
};

console.log(greet("Bob"));

⚡ 3. Arrow Functions (ES6+)

Shorter syntax for writing functions, especially useful in callbacks.

const add = (a, b) => a + b;

console.log(add(5, 3)); // Output: 8

📘 Parameters & Return

Functions can take parameters and return a value using the return keyword.

function square(x) {
    return x * x;
}

let result = square(4);
console.log(result); // 16