Introduction to JavaScript

A powerful language for creating dynamic web experiences. From simple form validation to complex applications like games and web frameworks, JavaScript does it all.

History

Created in 1995 by Brendan Eich at Netscape, JavaScript was initially called Mocha, then LiveScript, and finally JavaScript to leverage Java's popularity. In 1997, it was standardized as ECMAScript. Over time, it became essential for web development, enabling dynamic features in browsers. The rise of AJAX in 2005 allowed for asynchronous updates without reloads. Node.js in 2009 extended JavaScript to the server side, and modern features like arrow functions, classes, and promises were introduced in ES6 (2015). Today, JavaScript is one of the most widely used programming languages, powering websites, server-side applications, and mobile apps.

Features of JavaScript

JavaScript is a versatile language that offers:

Dynamically typed variables
Object-oriented programming with prototypes and classes
Event-driven programming with seamless event handling
First-class functions for functional programming
Asynchronous programming with callbacks, Promises, and async/await
Powerful DOM manipulation capabilities
Closures for encapsulation and private data
Prototype-based inheritance
Modern features like template literals, destructuring assignment, modules, arrow functions, spread and rest operators
Rich ecosystem of libraries, frameworks, and APIs

Basic Programs

Triangle Area Calculator

Base:
Height:

Area:

Calculator

Enter first number:
Enter second number:
Enter operator:

Result:

Temperature Conversion

Temperature (°C):

Temperature (°F):

Swapping Values

Value A:
Value B:

Value A:
Value B:

Interest Calculation

Principal:
Rate (%):
Time (years):

Interest:

ASCII Converter

Enter Text:

ASCII Codes:

IF-ELSE Programs

Even or Odd Checker

Enter a Number:

Result:

Leap Year Checker

Enter a Year:

Result:

Vote Eligibility Checker

Enter Age:

Result:

Day Name Finder

Enter Day Number (1-7):

Day:

Character Checker

Enter a Character:

Result:

Find Maximum Number

Enter First Number:
Enter Second Number:

Maximum Number:

Negative vs Positive Checker

Enter a Number:

Result:

LOOP Programs

Star Pattern

Enter Number of Rows:

Floyd's Triangle

Enter Number of Rows:

Fibonacci Sequence

Enter Number of Terms:

Prime Number Checker

Enter a Number:

Result:

Palindrome Checker

Enter Text:

Result:

Decimal to Binary Converter

Enter Decimal Number:

Binary:

Triangle Pattern

Enter Number of Rows:

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