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Facebook code kinda has three layers: 1. clients (Objective-C for iOS, Java for Android, JS for Web and React Native) 2. application logic (Hack) 3. services (

Facebook code kinda has three layers: 1. clients (Objective-C for iOS, Java for Android, JS for Web and React Native) 2. application logic (Hack) 3. services (c++ and python are most prominent and well-supported, but there's a long tail of languages like Java, Haskell, OCaml, Ruby, etc.) The prominent languages in each layer have pretty substantial code-bases. More importantly, there's an engineering culture of eschewing "code ownership" and encouraging "code upgradability" so that motivated folks like Jason can drive these large changes.

wodenokoto 8y ago
Did facebook drop php? I thought they were really vested in it, with their HipHop VM and whatnot.
- yunyu 8y ago
  Hack is a typed variant of PHP.
  - sopooneo 8y ago
    Did they create Hack before PHP 7, which has near full typing on its own?
    - Implicated 8y ago
      Yes.
    - ckwalsh 8y ago
      Yes, and the php7 typing system is heavily influenced by Hack. However, Hack goes further with support for more typehint features + a typechecker daemon
- codetrotter 8y ago
  First they made HHVM for PHP and then they made the Hack language for HHVM. Hack is based on PHP. I don’t know how much non-Hack PHP they still have but it is my impression that they turned pretty much all of their PHP code into Hack code. https://hacklang.org/ https://hacklang.org/
  - philwelch 8y ago
    "Programming Productivity Without Breaking Things" Nice. That's cute.