Hack: a new programming language for HHVM

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Julien Verlaguet
•8 min read•advanced•
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OCamlPHP

Overview

Hack is a new programming language developed by Facebook for the HHVM runtime, designed to enhance PHP development with static typing and modern programming features. It allows for seamless interoperability with PHP while improving code safety and developer productivity.

What You'll Learn

1

How to integrate Hack into an existing PHP codebase

2

Why static typing can improve code safety and developer productivity

3

How to utilize Hack's Collections API for functional programming

4

When to apply run-time enforcement of types in Hack

Prerequisites & Requirements

  • Familiarity with PHP programming concepts
  • Experience with dynamically typed languages(optional)

Key Questions Answered

What is Hack and how does it relate to PHP?
Hack is a programming language developed by Facebook that enhances PHP with static typing and modern features. It allows developers to write code that is both dynamically and statically typed, providing a balance between rapid development and error detection.
How does Hack improve developer productivity?
Hack improves productivity by introducing static typing, which helps catch errors early, and features like Collections and lambda expressions that simplify coding patterns. This leads to better code quality and faster development cycles.
What are the key features of Hack?
Key features of Hack include static typing, generics, nullable types, type aliasing, Collections, lambda expressions, and run-time enforcement of types. These features enhance code safety and developer experience.
How does Hack handle type checking during development?
Hack employs a local server for type checking that watches the filesystem and updates in real-time. This allows for instantaneous feedback, running checks in less than 200 milliseconds, thus integrating smoothly into the development workflow.

Technologies & Tools

Backend
Hhvm
HHVM is the runtime that supports both PHP and Hack, allowing developers to use Hack's features incrementally.
Programming Language
Hack
Hack is designed to enhance PHP development with static typing and modern programming features.

Key Actionable Insights

1
To maximize the benefits of Hack, start integrating it into your existing PHP projects gradually. This allows you to leverage static typing and modern features without needing a complete rewrite.
Gradual integration can help teams adapt to Hack's features while maintaining existing PHP functionality, making the transition smoother and less disruptive.
2
Utilize Hack's Collections API to replace traditional PHP arrays for better type safety and functional programming capabilities.
By using Collections, developers can write cleaner, more maintainable code that takes advantage of higher-order functions, improving overall code quality.
3
Implement run-time type enforcement in Hack to catch errors that static typing may miss during gradual migration.
This ensures that as you transition to Hack, you can still maintain a level of safety and error detection, enhancing the reliability of your codebase.

Common Pitfalls

1
One common pitfall is underestimating the learning curve associated with transitioning from PHP to Hack, particularly regarding static typing and new language features.
This transition can lead to frustration if developers are not adequately prepared for the differences in type handling and syntax, making it essential to invest time in learning Hack's features.