JavaScript is a programming language that powers the web.

It is widely used for building interactive websites and applications.

You can run JavaScript directly in your browser.

• Client-side scripting
• Lightweight
• Prototype-based

Variables store data values.

In JavaScript, you can use var, let, or const.

let name = "Tino";

const PI = 3.14;

• let → block scope
• const → cannot be reassigned

Functions are reusable blocks of code.

You can define a function using the function keyword.

function greet() { return "Hello"; }

Arrow functions provide a shorter syntax.

const greet = () => "Hello";

• Reusable
• Modular
• Scalable

Loops allow you to run code multiple times.

The most common loops are for and while.

for (let i=0; i<5; i++) { console.log(i); }

while (x < 10) { x++; }

• for loop
• while loop
• do...while loop

Arrays hold multiple values in one variable.

They are ordered collections that can be iterated.

let nums = [1,2,3,4];

nums.push(5);

console.log(nums.length);

• push()
• pop()
• map()
• filter()