News Feed
Sections




News Archive
Looking for more information on how to do PHP the right way? Check out PHP: The Right Way

Zend Developer Zone:
Liskov Substitution Principle...attempted
June 07, 2011 @ 11:09:41

In a previous post to the Zend Developer Zone Keith Casey talked about the SOLID principles of software development, a set of guidelines that can help to make software more maintainable and easier to work with. In this new post he looks at the "L" in SOLID, the Liskov Substitution Principle.

So the Liskov Substitution Principle boils down to: method/class preconditions cannot be strengthened, method/class post conditions can't be weakened, all exceptions thrown must equally interchangeable and method signatures should be completely compatible.

To help make this all a bit clearer, he includes some code showing a basic class (Rectangle) and how difficult it can be to try to appease all of the principles above without the "fix one, break another" scenario. On comment to the post suggests something that might help things a bit - programming by contract.

0 comments voice your opinion now!
solid software development liskov substitution principle


blog comments powered by Disqus

Similar Posts

Job Posting: Software International (Recuriter) Seeks Web Development Team Lead (Toronto, Canada)

Carson Workshops: Professional PHP Development (Two-day Workshop)

Brandon Savage's Blog: Bug-Free: Using XDebug To Improve Development (Part 2 of N)

Paul Jones' Blog: TDD, Test-First, and Ravioli Code

Job Posting; NewHire Seeks Software Developer (Chicago, IL)


Community Events





Don't see your event here?
Let us know!


laravel install deployment tips community framework opinion series introduction release language api update zendserver package podcast list library interview symfony

All content copyright, 2014 PHPDeveloper.org :: info@phpdeveloper.org - Powered by the Solar PHP Framework