Hack & HHVM Documentation

Moving fast with high-performance Hack, a programming language for building reliable websites at epic scale

Install Hack, run your first program, and get introduced to the tools.

Website: hacklang.org

Install HHVM on a supported platform, and learn about ways to run and configure HHVM.

Website: hhvm.com

Documentation for all functions, classes, interfaces, and traits in the Hack Standard Library (HSL).