Factorial Calculator - Hack Typing CST Test
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Factorial Calculator — Hack Code
Calculates factorial of a number using recursion.
<?hh
function factorial(int $n): int {
return $n === 0 ? 1 : $n * factorial($n - 1);
}
<<__EntryPoint>>
function main(): void {
echo factorial(5) . "\n";
}Hack Language Guide
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.
Primary Use Cases
- ▸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
Notable Features
- ▸Optional static typing for safety and performance
- ▸Type inference to reduce boilerplate
- ▸Compatibility with PHP codebases
- ▸Collections and async support
- ▸Generics and shape types for advanced type modeling
Origin & Creator
Developed by Facebook in 2014.
Industrial Note
Hack is mainly used for large-scale web applications, especially for projects requiring high performance, maintainability, and gradual typing within PHP-based systems.