Hack (programming language)
| Hack | |
|---|---|
| Paradigms | Multi-paradigm: imperative, functional, object-oriented, procedural, reflective |
| Family | PHP |
| Designed by | Julien Verlaguet, Alok Menghrajani, Drew Paroski, others |
| Developer | Meta Platforms |
| First appeared | 2014 |
| Stable release | 4.172
/ 2 November 2022 |
| Typing discipline | Static, dynamic, weak, gradual |
| OS | Cross-platform |
| License | MIT |
| Website | hacklang |
| Influenced by | |
| PHP, OCaml, Java, C#, Scala, Haskell | |
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Hack is a programming language for the HipHop Virtual Machine (HHVM), created by Meta (formerly Facebook) as a dialect of PHP. The language implementation is free and open-source software, licensed under an MIT License.
Hack allows use of both dynamic typing and static typing. This kind of a type system is called gradual typing, which is also implemented in other programming languages such as ActionScript. Hack's type system allows types to be specified for function arguments, function return values, and class properties; however, types of local variables are always inferred and cannot be specified.