Learn HACK with Real Code Examples

Runs on HHVM (HipHop Virtual Machine)

Supports both static and dynamic typing

Compiles Hack code for efficient execution

Supports asynchronous I/O

Type system integrated at runtime and compile-time

Hack code executed on HHVM runtime

Static typechecking at compile time via hh_client

Dynamic execution for untyped sections

Async functions scheduled via event loop

Integration with PHP libraries where needed

Web backend services

Async event-driven programming

Type-safe APIs

PHP-Hack mixed codebases

Large-scale modular application design

Facebook backend services

High-performance REST/GraphQL APIs

Async data processing pipelines

Large-scale web applications

PHP codebases upgraded to Hack gradually

Gradual typing for backward compatibility

High-performance web execution on HHVM

Async and concurrent programming support

Compatibility with PHP ecosystem

Modern language constructs for maintainable code

Use Hack collections for memory efficiency

Employ async functions for concurrent requests

Modularize code into reusable components

Leverage HHVM JIT compilation for performance

Typecheck code regularly to prevent runtime errors

Gradually add type annotations to PHP code

Replace legacy PHP constructs with Hack equivalents

Adopt Hack collections for structured data

Refactor code for async/await patterns

Test with HHVM typechecker and runtime