HHVM and Hack Documentation

Hack

Getting Started
- Getting Started
  Installing Hack, running your first program, and introducing the tools.
- Source Code Fundamentals
  Basic syntax, namespaces, and the autoloader.
- Functions
  Named functions, anonymous functions and parameters.
- Arrays And Collections
  Hack arrays, (legacy) PHP arrays, and mutable collections.
- Built In Types
  Built-in types known to the type checker.
- Silencing Errors
  HH_FIXME best practices and error codes.
Control Flow
- Expressions And Operators
  Expressions, operators, associativity, and precedence.
- Statements
  Simple statements, blocks, and loops.
- Asynchronous Operations
  Asynchronous functions, await, and the concurrent keyword.
Classes, Interfaces, Traits
- Classes
  Classes provide a way to group functionality and state together.
- Traits And Interfaces
  Implementing class capabilities and optimizing code reuse.
- Attributes
  Attaching metadata to Hack programs, built-in attributes and defining your own.
- XHP
  Safe, composable HTML templating.
Types and Generics
- Types
  The type checker.
- Generics
  Generic types, where constraints, and variance.
- Contexts And Capabilities
  A generalized system for the description and enforcement of permissions and restrictions of a context.
- Reified Generics
  Generics with type information accessible at runtime.
Experimental Additions
- Experimental Features
  Experimental features in the Hack language.

Full reference docs for all functions, classes, interfaces, and traits in the Hack language.

Full reference docs for all functions, classes, interfaces, and traits in the Hack Standard Library (HSL).