# JavaScript

Launchpad’s front end is built using the YUI 3 library and ships its JavaScript
through a custom build system.

* [The Launchpad JavaScript build system](https://ubuntu.com/docs/launchpad/developer/explanation/javascript/javascript-buildsystem/index.html.md)
* [Integration testing in JavaScript](https://ubuntu.com/docs/launchpad/developer/explanation/javascript/javascript-integration-testing/index.html.md)
* [Developing with YUI.Test](https://ubuntu.com/docs/launchpad/developer/explanation/javascript/javascript-unittesting/index.html.md)