Hack is an object-oriented programming language specifically designed for building reliable websites on a grand scale. With Hack, you can enjoy the convenience of fast development cycles offered by dynamically typed languages, while also benefiting from the discipline provided by static typing. This language incorporates a plethora of features commonly found in modern programming languages, enabling you to code efficiently.

One of the standout features of Hack is its instantaneous type checking, which incrementally checks your files as you edit them. This process typically takes less than 200 milliseconds, ensuring a seamless integration into your development workflow without causing any noticeable delays. Hack is built specifically for HHVM, a high-performance runtime, making it an ideal choice for developing robust applications.

Moreover, Hack was developed by Meta and offers built-in safety features, such as static typechecking. Whether you're a seasoned developer or just getting started, Hack provides a powerful and reliable platform for creating exceptional web experiences