Hacklang.org Website Review

Hack reconciles the fast development cycle of a dynamically typed language with the discipline provided by static typing, while adding many features commonly found in other modern programming languages. Hack provides instantaneous type checking by incrementally checking your files as you edit them. It typically runs in less than 200 milliseconds, making it easy to integrate into your development workflow without introducing a noticeable delay. There is a type mismatch on the right. Try and fix the error.   const int MyConst = 0;   private string $x = '';   public function increment(int $x): int {     $y = $x + 1; Type annotations allow for code to be explicitly typed on parameters, clas* member variables and return values. Generics allow clas*es and methods to be parameterized (i.e., a type as*ociated when a clas* is instantiated or a method is called) in the   public function getData(): T {     return $this->data; function foo(): (function(string): string) {   $x = 'bar';