Part 1 — Definition

A Function is a block of code designed to perform a particular task. It is executed when "something" invokes it (calls it). Functions allow you to reuse code: Define the code once, and use it many times.

Part 2 — Syntax

function sayHello(name) {
    console.log("Hello " + name);
}

// Call
sayHello("Alice");

Part 3 — Example

Problem: Create a function that adds two numbers and returns the result.

function add(a, b) {
    return a + b;
}

let result = add(5, 10);
console.log(result); // 15

Part 4 — Video

Video: Coming Soon

Part 1 — Definition

Arrow Functions are a shorter syntax for writing functions, introduced in ES6. Scope determines the accessibility of variables. Variables defined inside a function are "Local" and cannot be accessed from outside.

Part 2 — Syntax

const greet = () => console.log("Hi");
let globalVar = "I am everywhere";

Part 3 — Example

Problem: Demonstrate local scope vs global scope.

let name = "Global";

function testScope() {
    let name = "Local";
    console.log(name); // Prints "Local"
}

testScope();
console.log(name); // Prints "Global"

Part 4 — Video

Video: Coming Soon