Hack (programming language)

Hack is a programming language for the HipHop Virtual Machine (HHVM), created by Meta as a dialect of PHP. The language implementation is open-source, licensed under the MIT License.[2][3][4]

Hack allows programmers to use 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.[5] 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.

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