This paper takes a code’s-eye view of software reuse and evolution. A code-level artifact must be able to attract programmers in order to survive and flourish. The paper addresses the question of what an object might do to encourage programmers to (re-)use it, as opposed to using some other object, or building new ones. THE SELFISH CLASS pattern shows how focusing on code, rather than systems, processes, or personnel, can lead to fresh insights into software evolution and the forces that drive it.

Take you on an automated teleportation tour around your Minecraft world
Build massive monuments, pyramids, forests, and more in a snap!
Make secret passageways that open when you activate a hidden switch
Create a spooky ghost town that vanishes and reappears elsewhere
Show exactly where to dig for rare blocks
Cast a spell so that a cascade of flowers (or dynamite if you’re daring!) follows your every move
Make mischief with dastardly lava traps and watery curses that cause huge floods

Claim your PHP Development Box in 60 seconds. Code on your box in the cloud via our Web IDE, your favorite Desktop Editor, or our Chrome application. Share boxes and code together right in your browser.

CodePen is for Web Designers and Front End Developers. It is an HTML, CSS, and JavaScript code editor in your browser with instant previews of the code you see and write. It is a searchable trove of your own creations, and a world of other people's creations. A place to troubleshoot, to teach, to learn, to test, and to grow.

There’s a lot of outdated information on the Web that leads new PHP users astray, propagating bad practices and insecure code. PHP: The Right Way is an easy-to-read, quick reference for PHP popular coding standards, links to authoritative tutorials around the Web and what the contributors consider to be best practices at the present time. There is no canonical way to use PHP.