TypeScript Introduction

TypeScript tutorial

🚀 TypeScript Introduction

What is TypeScript?

TypeScript is an open-source programming language developed by Microsoft.
It is a superset of JavaScript, which means any valid JavaScript code is also valid TypeScript code.

TypeScript adds static typing and powerful development features on top of JavaScript, making large-scale applications easier to build and maintain.

Why TypeScript?

JavaScript is flexible, but that flexibility can cause runtime errors in big projects.
TypeScript helps catch errors before the code runs.

✅ Key Benefits

  • Static Typing – Detect errors at compile time

  • Better Code Readability

  • Improved IDE Support (auto-complete, refactoring)

  • Scales Well for large applications

  • Modern JavaScript Features (ES6+ support)

How TypeScript Works

  1. You write code in .ts files

  2. TypeScript checks types and errors

  3. It compiles to JavaScript

  4. The browser runs the JavaScript

📌 Browsers do not understand TypeScript directly

Simple Example

JavaScript (Error not detected early)

function add(a, b) {
return a + b;
}add(10, “20”); // Result: “1020”

TypeScript (Error detected)

function add(a: number, b: number): number {
return a + b;
}add(10, “20”); // ❌ Error

Main Features of TypeScript

  • Types (number, string, boolean, array, tuple)

  • Interfaces

  • Enums

  • Classes & OOP

  • Generics

  • Type Inference

  • Access Modifiers (public, private, protected)

Where is TypeScript Used?

  • Frontend frameworks (Angular, React, Vue)

  • Backend (Node.js, NestJS)

  • Large enterprise applications

  • Cross-platform apps

TypeScript File Extension

.ts → TypeScript file
.tsx → TypeScript with JSX (React)

Who Should Learn TypeScript?

✔ JavaScript Developers
✔ Web Developers
✔ Full Stack Developers
✔ Anyone building large or scalable apps

Summary

Feature JavaScript TypeScript
Type Safety ❌ No ✅ Yes
Error Detection Runtime Compile Time
Scalability Medium High
Learning Curve Easy Moderate

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