Learn Hack - 10 Code Examples & CST Typing Practice Test
Hack is a programming language developed by Facebook as a dialect of PHP. It adds static typing, enhanced performance, and modern programming features while maintaining compatibility with PHP, enabling rapid development of large-scale web applications.
Learn HACK with Real Code Examples
Updated Nov 20, 2025
Performance Notes
Optimized via HHVM JIT compilation
Static typing improves runtime safety
Async programming reduces blocking
Use Hack collections for efficient memory usage
Gradual typing allows incremental performance tuning
Security Notes
Static typing helps prevent runtime type errors
Validate user input and outputs
Use HHVM security best practices
Avoid unsafe PHP function usage
Implement secure async operations
Monitoring Analytics
Monitor async workflows and performance
Check HHVM server logs
Validate type safety with hh_client
Profile resource usage
Audit deployed Hack services
Code Quality
Use static typing for clarity and safety
Organize code into modules and namespaces
Document shapes, generics, and functions
Write unit and integration tests
Leverage typechecker to catch errors early
Frequently Asked Questions about Hack
What is Hack?
Hack is a programming language developed by Facebook as a dialect of PHP. It adds static typing, enhanced performance, and modern programming features while maintaining compatibility with PHP, enabling rapid development of large-scale web applications.
What are the primary use cases for Hack?
Large-scale web application development. Maintaining and modernizing PHP codebases. Developing scalable backend services. Improving code safety with static typing. Rapid iteration and prototyping in web projects
What are the strengths of Hack?
Improves reliability with static typing. Maintains compatibility with existing PHP code. Enhances code readability and maintainability. Optimized for large-scale web applications. Supports modern programming patterns
What are the limitations of Hack?
Primarily used within Facebook or HHVM ecosystems. Smaller community compared to mainstream PHP. Requires HHVM runtime, not standard PHP engine. Not ideal for small-scale or non-web projects. Learning curve for developers new to static typing
How can I practice Hack typing speed?
CodeSpeedTest offers 10+ real Hack code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.