Hack – programming language for HHVM – seamlessly PHP

Today we’re releasing Hack, a programming language we developed for HHVM that interoperates seamlessly with PHP. Hack reconciles the fast development cycle of PHP with the discipline provided by static typing, while adding many features commonly found in other modern programming languages.

We have deployed Hack at Facebook and it has been a great success. Over the last year, we have migrated nearly our entire PHP codebase to Hack, thanks to both organic adoption and a number of homegrown refactoring tools.

We’re also proud to release an open source version of Hack to the public http://www.hacklang.org/ as part of our HHVM runtime platform, which will now support both Hack and PHP.



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