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
Practical Examples
Building a social media backend
Creating type-safe REST APIs
Async data processing pipelines
Integrating Hack with existing PHP code
High-performance web services
Troubleshooting
Check type errors in static analysis
Ensure HHVM runtime is configured
Debug async/await logic
Validate PHP compatibility
Test integration with existing code
Testing Guide
Run hh_client for type checking
Execute HackTest unit tests
Test async workflows
Validate PHP-Hack interoperability
Monitor runtime behavior in HHVM
Deployment Options
HHVM server for web applications
Command-line Hack scripts
Async services and daemons
Integration in PHP ecosystems
High-performance backend APIs
Tools Ecosystem
HHVM runtime
Hack typechecker (hh_client)
Hack language server (LSP)
IDEs with Hack support (VS Code, PhpStorm)
Unit testing frameworks (HackTest)
Integrations
Existing PHP codebases
REST and GraphQL APIs
Databases like MySQL and PostgreSQL
Async services and message queues
Web frameworks compatible with HHVM
Productivity Tips
Gradually add type annotations
Use async/await for concurrency
Modularize reusable logic
Test often with typechecker
Leverage Hack collections and shapes
Challenges
Migrate a PHP module to Hack
Implement a type-safe REST API
Build an async data processing service
Integrate Hack with existing PHP backend
Optimize code for HHVM performance
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.