This wraps up the series of posts on SOLID Code with Emergent Design. Dependency Inversion Principle “Separate interfaces so callers are only dependent on what they actually use” The SOLID principles really boil down to managing your dependencies between classes. And, by “manage”, we really mean “get rid of those suckers.” Removing dependencies (aka, de-coupling) […]
This is the 5th post on SOLID Code with Emergent Design. Interface Segregation Principle “Separate interfaces so callers are only dependent on what they actually use” Or, more simply… Avoid “fat” interfaces This principle is about breaking down our interfaces to be highly cohesive. You might have a server that provides methods to a number […]
This is the 4th post on SOLID Code with Emergent Design. Liskov Substitution Principle "Derived classes must be usable through the base class interface without the need for the user to know the difference" This principle is about following good techniques for inheritance. It says code that uses the base class should not need to […]
This is the 3rd post on SOLID Code with Emergent Design. Open/Closed Principle "Modules should be open for extension, but closed for modification" The idea here is that adding new features should always be able to be handled by simply adding new code. It should never require modifying existing code. The benefit is that if […]
See Part 1 of this series on how the SOLID principles can help us follow emergent design without the Big Up Front Design and without the code rot. Single Responsibility Principle "A class should have one, and only one, reason to change" In software, we tend to enjoy grouping things together, but really what we […]
Emergent design can quickly degrade into un-maintainable hack & slash yuckness without a set of guiding principles to keep you in check. Fortunately, Robert Martin’s SOLID Principles are just what the doctor ordered for saving your app from an early demise. By making sure your code continues to conform to these principles with each new […]
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Abby Fichtner is The Hacker Chick. She helps people build amazing technology and push the edge on what's possible.
She's taught classes for MIT and Harvard on innovation and entrepreneurship, worked with hundreds of entrepreneurs, and been named an Innovation Amplifier by the Boston Globe, one of the Top 25 Women in Boston Tech, and Boston's Startup Gaurdian Angel.
After 3 years at Harvard Innovation Lab, Abby now helps individuals to create their own products and businesses so they can bring in additional money, become their own boss, gain financial freedom, and do work they feel proud of.