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💻 JavaScript Learning Series: Day 1

📚 Topic 1: Introduction to JavaScript

Hi guys! Let's start learning JavaScript from scratch.

Today, we'll understand what JavaScript is, why it is used, and how it works.

1. What is JavaScript?

JavaScript is a high-level programming language primarily used to make websites interactive and dynamic.

HTML creates the structure of a webpage.

CSS adds styling and design.

JavaScript adds functionality and interactivity.

Example:

• HTML ➜ Creates a button.

• CSS ➜ Changes the button's color and appearance.

• JavaScript ➜ Makes something happen when you click the button.

2. Why Learn JavaScript?

JavaScript is one of the most widely used programming languages.

You can use it for:

🔹 Web Development ➜ Building interactive websites.

🔹 Frontend Development ➜ Creating user interfaces using React, Angular, and Vue.

🔹 Backend Development ➜ Building server-side applications using Node.js.

🔹 Mobile App Development ➜ Building applications using React Native.

🔹 Game Development ➜ Creating browser-based games.

🔹 Automation ➜ Automating repetitive tasks.

🔹 API Development ➜ Building applications that communicate with other systems.

3. Features of JavaScript

🔹 Lightweight ➜ Easy to get started with.

🔹 Dynamically Typed ➜ Variables can hold values of different types during execution.

🔹 Interpreted/JIT Compiled ➜ Modern JavaScript engines use interpretation and just-in-time compilation.

🔹 Event-Driven ➜ Responds to events such as clicks, keyboard input, and form submissions.

🔹 Asynchronous ➜ Supports non-blocking operations using callbacks, promises, and async/await.

🔹 Object-Based ➜ Supports objects and prototype-based inheritance.

🔹 Cross-Platform ➜ Runs in browsers and server environments.

4. Where Does JavaScript Run?

JavaScript can run in different environments.

🔹 Web Browsers ➜ Chrome, Firefox, Safari, and Edge.

🔹 Node.js ➜ Runs JavaScript outside the browser.

🔹 Deno ➜ A modern JavaScript and TypeScript runtime.

🔹 Bun ➜ A JavaScript runtime and toolkit.

5. Your First JavaScript Program

Let's write our first JavaScript code.

console.log("Hello, World!");

Output:

Hello, World!

Explanation:

• console.log() is used to display output in the console.

• "Hello, World!" is the text we want to display.

• Every time this statement executes, the message appears in the console.

6. How to Run JavaScript?

You don't need to install anything to get started.

Method 1: Browser Console

• Open Google Chrome.

• Right-click on any webpage.

• Select Inspect.

• Open the Console tab.

• Type your JavaScript code.

• Press Enter.

Method 2: Online Editors

• Playcode

• JSFiddle

• Codepan

Method 3: VS Code

• Install Visual Studio Code.

• Create a file named index.html.

• Add JavaScript inside a script tag.

• Open the HTML file in your browser.

7. JavaScript vs Java

Don't confuse JavaScript with Java. They are two different programming languages.

🔹 Java ➜ Commonly used for enterprise applications, backend systems, and Android development.

🔹 JavaScript ➜ Commonly used for interactive websites, frontend development, and backend development with Node.js.

8. What Should You Remember?

• JavaScript makes websites interactive.

• It works in browsers and server environments.

• It is dynamically typed.

• It supports asynchronous programming.

• It is an essential technology for modern web development.

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💻 JavaScript Learning Series, Day 2

Topic 2: Variables & Data Types in JavaScript

Today, we'll learn how to store information in JavaScript and understand the different types of data we can work with.

1. What Are Variables?

A variable is a named container used to store data in a program.

For example:

let name = "John";
let age = 25;
let salary = 45000;

console.log(name);
console.log(age);
console.log(salary);

Output:

John
25
45000

Here:

• name stores a string.
• age stores a number.
• salary stores a number.

2. How to Declare Variables

JavaScript provides three main ways to declare variables.

A. var

• Function-scoped.
• Can be redeclared.
• Can be reassigned.
• Generally avoided in modern JavaScript.

var city = "Mumbai";
var city = "Pune";

console.log(city);

B. let

• Block-scoped.
• Cannot be redeclared in the same scope.
• Can be reassigned.

let age = 25;
age = 30;

console.log(age);

Output: 30

C. const

• Block-scoped.
• Cannot be redeclared in the same scope.
• Cannot be reassigned.

const country = "India";

console.log(country);

Output: India

Remember: A const object or array can still have its contents modified. The variable binding itself cannot be reassigned.

3. Difference Between var, let & const

Feature: Scope
var: Function
let: Block
const: Block

Feature: Reassignment
var: Yes
let: Yes
const: No

Feature: Redeclaration
var: Yes
let: No
const: No

Feature: Hoisting
var: Yes
let: Yes
const: Yes

Feature: Initialization required
var: No
let: No
const: Yes

Best Practice: Use const by default and let when reassignment is required. Avoid var in modern JavaScript.

4. JavaScript Data Types

JavaScript has two broad categories of data types.

A. Primitive Data Types

There are seven primitive types.

1. String

Used to store text.

let name = "Rahul";

2. Number

Used for integers and decimal values.

let age = 25;
let price = 99.99;

3. Boolean

Stores either true or false.

let isActive = true;
let isCompleted = false;

4. Undefined

A variable that has been declared but not assigned a value.

let result;

console.log(result);

Output: undefined

5. Null

Represents an intentional absence of a value.

let selectedUser = null;

6. BigInt

Used for integers larger than the safe integer limit of the Number type.

let bigNumber = 12345678901234567890n;

7. Symbol

Creates unique identifiers.

let id = Symbol("user");

B. Non-Primitive Data Types

These are commonly represented using objects.

1. Object

Stores data in key-value pairs.

let student = {
    name: "Rahul",
    age: 22,
    city: "Delhi"
};

2. Array

Stores multiple values in an ordered collection.

let fruits = ["Apple", "Mango", "Banana"];

3. Function

A reusable block of code.

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

5. Checking Data Types Using typeof

JavaScript provides the typeof operator to identify the type of a value.

console.log(typeof "Hello");
console.log(typeof 100);
console.log(typeof true);
console.log(typeof undefined);
console.log(typeof 100n);
console.log(typeof Symbol("id"));
console.log(typeof {});

string
number
boolean
undefined
bigint
symbol
object

Important: typeof null also returns "object". This is a historical JavaScript behavior.

6. Dynamic Typing in JavaScript

JavaScript is dynamically typed. This means a variable can hold different types of values during execution.

let data = 100;

console.log(data);

data = "Hello JavaScript";

console.log(data);

100
Hello JavaScript

The same variable first stores a number and then stores a string.

7. Type Conversion

Type conversion means converting one data type into another.

String to Number

let value = "100";

let result = Number(value);

Output: 100

Number to String

let age = 25;

let result = String(age);

Output: 25 (as a string)

String to Boolean

let value = "Hello";
console.log(Boolean(value));

Output: true

8. Variable Naming Rules

Follow these rules when naming variables:

- Names can contain letters, numbers, _ and $.
- Names cannot start with a number.
- Variable names are case-sensitive.
- Reserved keywords cannot be used as variable names.
- Use meaningful names.

Good examples:

let firstName = "Rahul";
let totalPrice = 500;
let isLoggedIn = true;

Invalid examples:

let 1name = "Rahul";
let let = 100;

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💻 JavaScript Learning Series - Day 4

Topic 4: Conditional Statements in JavaScript

Conditional statements allow a program to make decisions based on whether a condition is true or false.

For example:

• Check whether a person is eligible to vote.
• Check whether a student has passed or failed.
• Verify login credentials.
• Apply discounts based on purchase amounts.

1. The if Statement

The

if

statement executes a block of code only when a condition is true.

Syntax:

if (condition) {
    // Code executes if condition is true
}

Example:

let age = 20;

if (age >= 18) {
    console.log("You are eligible to vote");
}

Output: You are eligible to vote

2. The if-else Statement

Executes one block when the condition is true and another when it is false.

let age = 16;

if (age >= 18) {
    console.log("Eligible to vote");
} else {
    console.log("Not eligible to vote");
}

Output: Not eligible to vote

3. The else-if Statement

Used when you need to check multiple conditions.

Example: Student Grading System

let marks = 85;

if (marks >= 90) {
    console.log("Grade A");
} else if (marks >= 75) {
    console.log("Grade B");
} else if (marks >= 60) {
    console.log("Grade C");
} else if (marks >= 40) {
    console.log("Grade D");
} else {
    console.log("Fail");
}

Output: Grade B

4. Nested if Statements

An

if

statement inside another

if

statement is called a nested

if

statement.

Example: Login Verification

let username = "admin";
let password = "12345";

if (username === "admin") {
    if (password === "12345") {
        console.log("Login Successful");
    } else {
        console.log("Incorrect Password");
    }
} else {
    console.log("Invalid Username");
}

Output: Login Successful

5. The switch Statement

Used when you want to compare one expression against multiple possible values.

switch (expression) {
    case value1:
        // Code
        break;

    case value2:
        // Code
        break;

    default:
        // Default code
}

Example: Day of the Week

let day = 3;

switch (day) {
    case 1:
        console.log("Monday");
        break;

    case 2:
        console.log("Tuesday");
        break;

    case 3:
        console.log("Wednesday");
        break;

    default:
        console.log("Invalid Day");
}

Output: Wednesday

Remember:

•

case

defines possible matching values.
•

break

prevents execution from falling through to the next case.
•

default

executes when no case matches.

6. Ternary Operator

A shorter way to write a simple if-else condition.

condition ? expression1 : expression2;

let age = 21;

let result = age >= 18
    ? "Adult"
    : "Minor";

console.log(result);

Output:

Adult

7. Multiple Conditions Using Logical Operators

AND (&&)

Both conditions must be true.

let age = 25;
let hasLicense = true;

if (age >= 18 && hasLicense) {
    console.log("You can drive");
}

OR (||)

At least one condition must be true.

let isWeekend = false;
let isHoliday = true;

if (isWeekend || isHoliday) {
    console.log("It's a day off");
}

NOT (!)

Reverses a Boolean condition.

let isLoggedIn = false;

if (!isLoggedIn) {
    console.log("Please log in");
}

8. Real-World Example: Online Shopping Discount

let purchaseAmount = 5000;
let discount = 0;

if (purchaseAmount >= 5000) {
    discount = 20;
} else if (purchaseAmount >= 3000) {
    discount = 10;
} else if (purchaseAmount >= 1000) {
    discount = 5;
}

let finalAmount =
    purchaseAmount - (purchaseAmount * discount / 100);

console.log("Purchase:", purchaseAmount);
console.log("Discount:", discount + "%");
console.log("Final Amount:", finalAmount);

Output:

Purchase: 5000
Discount: 20%
Final Amount: 4000

9. Types of Conditional Statements

🔹 if ➜ Checks one condition.

🔹 if-else ➜ Chooses between two possible paths.

🔹

else-if

➜ Checks multiple conditions.

🔹 Nested if ➜ Checks dependent conditions inside another condition.

🔹 switch ➜ Matches an expression against multiple possible values.

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