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Today we're releasing Hack, a programming language we developed for HHVM that 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 to Hack, thanks to both organic adoption and a number of homegrown refactoring tools.
Working alongside a handful of others inside the social networking giant, they fashioned a language that lets programmers build complex websites and other software at great speed while still ensuring that their software code is precisely organized and relatively free of flaws — a combination that few of today’s languages even approach. In typical Facebook fashion, the new language is called Hack, and it already drives almost all of the company’s website — a site that serves more than 1.2 billion people across the globe.
“We can say with complete assurance that this has been as battle-tested as it can possibly be,” says , a veteran of iconic tech companies Sun and Linden Lab who has long played an important role in a popular language called Haskell.
and company publicly revealed their new language this morning, and at the same time, they “open sourced” it, sharing the technology with the world at large and encouraging others not only to use it, but to help improve it.
The software world is littered with programming languages, and new ones appear all the time. But according to some who have used it or who know the past work of those who built it, Hack has a design and a pedigree that immediately set it apart.
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