CoffeeScript is a programming language that transcompiles to JavaScript. It adds syntactic sugar inspired by Ruby, Python and Haskell in an effort to enhance JavaScripts brevity and readability. Developed by Jeremy Ashkenas
License: Open Source
CoffeeScript focuses on enhancing JavaScript's readability and reducing boilerplate, making it suitable for quick prototyping. In contrast, Hack extends PHP with static typing and additional features, offering robustness for larger applications.