What is TypeScript?

TypeScript is a strongly typed programming language that builds on JavaScript. It adds static type checking to help catch errors early.

TypeScript is developed by Microsoft and is widely used in large-scale applications.

Why TypeScript?

• Catches errors at compile time
• Better IDE support and autocompletion
• Great for large codebases
• Compiles to plain JavaScript

Syntax

TYPESCRIPT

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let message: string = "Hello, TypeScript!";
let count: number = 42;
let isActive: boolean = true;

function greet(name: string): string {
    return `Hello, ${name}!`;
}

TypeScript Hello World

TYPESCRIPT

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let message: string = "Hello, TypeScript!";
console.log(message);

let count: number = 42;
let isActive: boolean = true;

function greet(name: string): string {
    return `Hello, ${name}!`;
}

console.log(greet("SukhNexus"));

Try It Yourself

Practice

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Exercise

What is the main benefit of TypeScript over JavaScript?

Answer

Static type checking — catches errors at compile time.

Quick Quiz

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What does TypeScript compile to?

Python

JavaScript

Java

C#

TypeScript compiles to plain JavaScript that runs in any browser.

Retry Quiz

Interview Questions

What is the difference between TypeScript and JavaScript?

TypeScript adds static type checking and compiles to JavaScript. JavaScript is dynamically typed.

Tutorial Complete

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