TypeScript Hello World Program – Code Sample

This article represents code samples on writing Hello World program with TypeScript. Please feel free to comment/suggest if I missed to mention one or more important points. Also, sorry for the typos.

Following are the key points described later in this article:

  • Setting up Typescript Development environment
  • TypeScript Hello World Program
Setting up Typescript Development environment

Use the instructions on following page to setup the TypeScript development environment. Docker – How to setup Typescript Development Environment

TypeScript Hello World Program
interface Person {
    firstname: string;
    lastname: string;

function hello(person: Person) {
    return "Hello, " + person.firstname + " " + person.lastname;

var calvin = {firstname: "Calvin", lastname: "Hobbes"};
var chris = {firstname: "Chris", lastname: ""};


Name the above program as “hello.ts”. Compile it using the command, “tsc hello.ts”. It would create the file “hello.js”. Execute the “hello.js” using node runtime using following command:

node hello.js

It would print following:

Hello, Calvin Hobbes
Hello, Chris

Ajitesh Kumar

I have been recently working in the area of Data analytics including Data Science and Machine Learning / Deep Learning. I am also passionate about different technologies including programming languages such as Java/JEE, Javascript, Python, R, Julia, etc, and technologies such as Blockchain, mobile computing, cloud-native technologies, application security, cloud computing platforms, big data, etc. For latest updates and blogs, follow us on Twitter. I would love to connect with you on Linkedin. Check out my latest book titled as First Principles Thinking: Building winning products using first principles thinking. Check out my other blog, Revive-n-Thrive.com
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