Learn HACK with Real Code Examples

Install HHVM on your system

Set up Hack language support

Configure environment paths

Test sample Hack scripts

Integrate with web server for development

Install HHVM

Configure hhconfig

Install Hack development tools

Set PATH for HHVM binaries

Test sample Hack scripts

hhconfig - project typecheck configuration

src/ - main Hack source code

lib/ - reusable libraries

tests/ - unit and integration tests

configs/ - HHVM server configurations

hh_client - typecheck Hack project

hh_server - start Hack typecheck server

hhvm script.hack - run Hack script

hhvm -web - run Hack web server

hh_client --json - get typecheck results

Supports UTF-8 strings

Works with global databases and APIs

Data formats can handle internationalized content

Compatible with international libraries in PHP

No built-in localization engine; relies on PHP ecosystem

Open-source and cross-platform via HHVM

Documentation available online

Community support through forums and GitHub

Gradual typing eases transition for PHP developers

Works well in large codebases and teams

Web applications styled with standard HTML/CSS/JS

Hack used for backend logic

Optional templating engines for frontend

Integration with frameworks like HackMVC

No built-in UI styling in language itself

Variables with optional static types

Collections for structured data

Async functions for managing concurrent state

Shapes for structured object-like data

Modules encapsulate reusable logic

Hack collections (vec, dict, keyset)

Typed variables and function arguments

Shapes for structured records

Persistent data via databases or files

Async pipelines for dynamic data handling