<?hh
function fib(int $n): int {
return $n < 2 ? $n : fib($n-1) + fib($n-2);
}
<<__EntryPoint>>
function main(): void {
for ($i = 0; $i < 10; $i++) {
echo fib($i) . "\n";
}
}Coding works best on desktop or with an external keyboard.
Generates first 10 Fibonacci numbers using recursion.
<?hh
function fib(int $n): int {
return $n < 2 ? $n : fib($n-1) + fib($n-2);
}
<<__EntryPoint>>
function main(): void {
for ($i = 0; $i < 10; $i++) {
echo fib($i) . "\n";
}
}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.
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.