JavaScript Introduction and Basics

JavaScript Introduction

• JavaScript (JS) is a programming language used to give instructions to a computer.
• Input (code) is processed by the computer, and output is generated.

Setting up VS Code

• VS Code is a free and popular code editor created by Microsoft.

First JavaScript Code

• console.log() is used to display messages in the console/terminal.
• console.log("Apna College"); is an example of printing "Apna College" in the console.

Variables in JavaScript

• Variables are containers for storing data.
• Example: radius storing the value 14.

Variable Rules

• Variable names are case-sensitive.
• Valid characters include letters, digits, underscore (_), and the dollar sign ($).
• Spaces are not allowed.
• The first character must be a letter, underscore, or dollar sign.
• Reserved words cannot be used as variable names.

let, const, and var

• var: Can be redeclared and updated, global scope.
• let: Cannot be redeclared but can be updated, block scope.
• const: Cannot be redeclared or updated, block scope.

Data Types in JavaScript

• Primitive data types include: Number, String, Boolean, Undefined, Null, BigInt, Symbol.

Additional Information (from images)

• Shradha Khapra is a co-founder of Apna College, an ex-Microsoft employee and TedX speaker.
• A practice question asks to create a constant object called "product" containing information about a pen.
• Another practice question asks to create a constant object "profile" containing information about a person.