Getting Started with TypeScript Hello World Example

TypeScript is an open-source programming language that is a superset of JavaScript. It provides optional static typing, classes, and interfaces to JavaScript. TypeScript is designed for large-scale applications that do not compromise on agility and maintainability. This article will guide you through a simple “Hello World” example in TypeScript, starting from installation to running your first TypeScript program.

Installation

TypeScript can be installed via Node.js, npm, and Visual Studio.

Using Node.js and npm

Step 1: Install Node.js on your computer from https://nodejs.org/en/.

Step 2: Open the Command Prompt or Terminal and type the following command to install TypeScript globally on your computer:

“`
npm install -g typescript
“`

Using Visual Studio

TypeScript can also be installed through Visual Studio. If you already have Visual Studio installed, you can proceed to create a new TypeScript file.

Creating a TypeScript File

Step 1: Open your code editor or Visual Studio and create a new file with the “.ts” extension. For example, “helloworld.ts”.

Step 2: Type the following code in the “helloworld.ts” file:

“`
function greet(name: string) {
return “Hello, ” + name;
}
console.log(greet(“World”));
“`

Compiling a TypeScript File

Step 1: Open the Command Prompt or Terminal and navigate to the directory where the “helloworld.ts” file is saved.

Step 2: Type the following command:

“`
tsc helloworld.ts
“`

The TypeScript compiler will compile the “helloworld.ts” file and generate a JavaScript file with the same name.

Running a TypeScript File

Step 1: Open the Command Prompt and navigate to the directory where the “helloworld.ts” file is saved.

Step 2: Type the following command:

“`
node helloworld.js
“`

Output: “Hello, World”

FAQs

What is TypeScript?

TypeScript is an open-source programming language that is a superset of JavaScript. It provides optional static typing, classes, and interfaces to JavaScript.

What are the advantages of using TypeScript?

TypeScript provides the following advantages:

– Optional static typing
– Classes and interfaces
– Better code organization and maintainability
– Better tooling and scalability
– Cross-platform support

What are the differences between JavaScript and TypeScript?

The main differences between JavaScript and TypeScript are:

– TypeScript is a superset of JavaScript and provides optional static typing.
– TypeScript provides classes and interfaces.
– TypeScript compiles to JavaScript.

How to install TypeScript?

TypeScript can be installed via Node.js, npm, and Visual Studio.

How to compile and run a TypeScript file?

A TypeScript file can be compiled to JavaScript using the TypeScript compiler by running the following command in the Command Prompt or Terminal:

“`
tsc .ts
“`

A compiled JavaScript file can be run by running the following command:

“`
node .js
“`

What is a “Hello World” example in TypeScript?

A “Hello World” example in TypeScript is a simple program that outputs “Hello, World” to the console.