🕹 JavaScript is the 
Programming Language 
for the Web.

🕹 JavaScript can update
and change both 
HTML and CSS.

🕹 JavaScript can calculate, 
manipulate and 
validate data.

@javascript_tut
"w3schools .com"

JavaScript, often abbreviated as JS,

is a programming language conforms to the ECMAScript specification.

JavaScript is high-level, often just-in-time compiled, and multi-paradigm.

It has curly-bracket syntax, dynamic typing, prototype-based object-orientation, and first-class functions. 


@javascript_tut
"Wikipedia"

💻 JavaScript Variables

JavaScript variables are containers for storing data values.

📌 In this example, x, y,
and z, are variables:

📎 Example:
------------------------------
var x = 5;
var y = 6;
var z = x + y;
------------------------------

@javascript_tut
"w3schools .com"

📎 Type Syntax

A variable must be declared before it is used. ES5 (JavaScript 5) syntax used the var keyword to achieve the same. The ES5 syntax for declaring a variable is as follows.

📎 Example:
------------------------------
var x = 5;
var y = 6;
var z = x + y;
------------------------------

ES6 (JavaScript 6) introduces the following variable declaration syntax −

📌 Using the let
📌 Using the const

📎 Example:
------------------------------
let x = 5;
const y = 6;
const z = x + y;
------------------------------

@javascript_tut
"Tutorialpoint"

ES 6 (JavaScript 6)

JavaScript Variables & Data Types

#1. JavaScript Numbers
JavaScript has only one type of number. Numbers can be written with or without decimals.


#2. JavaScript Strings
Strings store text. Strings are written inside quotes. You can use single or double quotes:


#3. JavaScript Objects
You have already learned that JavaScript variables are containers for data values.

Objects are variables too. But objects can contain many values.

#4. JavaScript Arrays
JavaScript arrays are used to store multiple values in a single variable.


#6. JavaScript Functions
A JavaScript function is a block of code designed to perform a particular task.

A JavaScript function is executed when "something" invokes it (calls it).

@javascript_tut
"w3schools .com"