In this part of the HTML5 course you will learn and practice TypeScript language.

TypeScript brings type safety to one of the most flexible, dynamic programming languages around: JavaScript.

About TypeScript

TypeScript is a open-source cross-platform language that aims at easing development of large scale applications written in JavaScript.

"TypeScript is a typed superset of JavaScript that compiles to plain JavaScript. Any browser. Any host. Any OS. Open source." ~ typescriptlang.org

• Was developed by Microsoft and was first made public in October 2012.
• Is a superset of ECMAScript 6 (ES6), and is backwards compatible with ECMAScript 5 (i.e. JavaScript). Thus, it is a superset of JavaScript. all JavaScript code is valid TypeScript code so it can be added seamlessly to any project.
• TypeScript adds common concepts such as strong typing , class-based object-orientation, modules, interfaces, generics to JavaScript. Produces modular code with less runtime errors because of compile-time type checking. Makes code more maintainable and reusable.
• TypeScript has to be transpiled to JavaScript before using it.
• It is widely used in Angular framework. Angular is built entirely in TypeScript, and as a result, using TypeScript with Angular provides a seamless experience.

Next Lesson

It is assumed that you are familiar with JavaScript, C or Java language (and object oriented concepts). In this lecture only TypeScript additions to JavaScript are overviewed.

Go to the next lesson in this lecture by pressing the right arrow on the bottom-left side of this page. You can use TypeScript playground to run code snippets introduced in this lecture. Thus, keep this link open.

This lecture gives an overview of the TypeScript. For the complete references, see the links in the 'Sites' tab on the top menu.

Enjoy learning TypeScript!