How to write a "Hello World" program in TypeScript
Nouman AbbasiTypeScript is an object-oriented language designed by Microsoft.
TypeScript is a superset of JavaScript that offers all of JavaScript’s features and TypeScript’s type system.
In this shot, we will see how to write a simple “Hello World” program in TypeScript.
Code
In this example, we declare a variable message of type string, and initialize it to ‘Hello World’. Unlike JavaScript, TypeScript is string.
// Declare and initialize 'message' of type string // to 'Hello World'. let message: string = 'Hello World'; // Printing the message to console. console.log(message);
TypeScript also supports type inference and will generate types in many cases.
In the example above, you can skip writing the type
(let message = 'Hello World';),
and TypeScript will correctly infer the type asstring.
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